January 2008 Rev 2 1/34 AN1794 Application note PractiSPIN evaluation system configuration and set up guide Introduction PractiSPIN is an evaluation and demonstration system that can be used with several STMicroelectronics motor driver integrated circuit devices. The system consists of a Graphical User Interface (GUI) program which runs on an IBM-PC under windows, a common ST7 based interface board that communicates with the PC and the practiSPIN software via a serial COMM port, and a device specific evaluation or target board that connects to the ST7 interface board via a standard 34 pin ribbon cable interface, as shown in Figure 1. The target PCB connects to the motor or motors and to a user supplied DC power supply generally in the range of 12 to 48 Vdc. The practiSPIN system is designed to operate the device being evaluated (the target device) under control of the practiSPIN software. Depending on which target device is being used, the practiSPIN software can operate the device to drive a stepper motor, 1 or 2 DC motors or a brushless DC (BLDC) motor. Figure 1. System block diagram www.st.com
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PractiSPIN evaluation system configuration and set up guide...8. Decel rate: set decel. rate to about 1000 steps/sec2. 9. Accel current: set accel curren t to about 25%. This is an
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January 2008 Rev 2 1/34
AN1794Application note
PractiSPIN evaluation systemconfiguration and set up guide
IntroductionPractiSPIN is an evaluation and demonstration system that can be used with several STMicroelectronics motor driver integrated circuit devices. The system consists of a Graphical User Interface (GUI) program which runs on an IBM-PC under windows, a common ST7 based interface board that communicates with the PC and the practiSPIN software via a serial COMM port, and a device specific evaluation or target board that connects to the ST7 interface board via a standard 34 pin ribbon cable interface, as shown in Figure 1. The target PCB connects to the motor or motors and to a user supplied DC power supply generally in the range of 12 to 48 Vdc.
The practiSPIN system is designed to operate the device being evaluated (the target device) under control of the practiSPIN software. Depending on which target device is being used, the practiSPIN software can operate the device to drive a stepper motor, 1 or 2 DC motors or a brushless DC (BLDC) motor.
To illustrate the operation of the practiSPIN system, we will look at one typical device supported by the system.
The L6207 includes two independent full or H bridges with separate logic inputs and current control functions.
The two bridges are designated A and B and their output pins designated as OUT1A, OUT2A, OUT1B, and OUT2B. These outputs are controlled independently by logic inputs IN1A, IN2A, IN1B, and IN2B respectively.
A logic high or low on any of these inputs will drive its corresponding output to the positive supply rail or to ground. Both of the A outputs will be forced to an off (high impedance) state if the ENA pin is taken logic low, as will the B outputs if ENB is taken low. The L6207 is thus controlled by six logic inputs: IN1A, IN2A, and ENA controlling bridge A and IN1B, IN2B, and ENB controlling bridge B. Each bridge also has an analog control signal, VREFA and VREFB, which control the current.
1.1 Target boardThe L6207 target board gives access to the bridge A and B outputs at connectors CN3 and CN4 respectively.
When driving a stepper motor, the two wires from one of the motor windings will connect to CN3 and the other winding will connect to CN4. Swapping between the two connectors or swapping the polarity at a given connector will only reverse the sense of motor direction. DC supply power in the range of 12 to 48 Vdc is connected at CN1. The polarity marked on the board silkscreen must be strictly observed! The eight control signals are taken from the 34-pin ribbon header (CN5) and are driven by the control interface PCB via a short flat cable.
1.2 Control interface boardThe control interface PCB is based on an ST72F264 microcontroller. The micro includes a UART and communicates with the practiSPIN software via 9 pin D connector P1 employing a standard RS232 interface.
The micro is based on flash memory and its firmware includes a write protected boot-loader routine that allows the practiSPIN software to update or change the operating program in the ST7 as required for different target boards. 5 Vdc power for the board is received via the 34-pin ribbon cable from the target board or can be directly supplied at J2 if jumper WJ1 is removed. The eight control signals for the target board are generated by the ST7 micro. The six logic signals are generated directly by six of the eight pins of port B while the two analog current references (VREFA and VREFB) are generated by pulse width modulated (PWM) signals generated by the ST7 along with an offset adjusting circuit controlled by potentiometer R18.
System overview AN1794
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Figure 2. ST7 interface board
AN1794 Starting practiSPIN
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2 Starting practiSPIN
Since the practiSPIN system is capable of supporting several driver IC's and driving different types of motors the user must first select the type of motor to be driven and the driver IC that will be evaluated.
1. Target board set up: configure the jumpers/switches on the target board and the ST7 interface board as described in the paragraph for the specific evaluation board being used.
2. Control board - PC connection: connect the ST7 interface board to a serial COMM port of the PC via a standard (straight through) 9 pin D connector cable.
3. Power up: energize the power supply.
4. Start practiSPIN software: on the PC, start the practiSPIN program.
5. Motor type selection: on the first screen of the practiSPIN software, the user can select the appropriate type of motor for the device under evaluation. Click on the appropriate motor type.
6. Communication settings: click the drop down list under "port selection" and select the COMM port being used. Baud rate and other communication parameters are fixed on both sides of the link and do not need to be set.
7. Establish COMM link: click the "Connect With ST7 Hardware". At this point the practiSPIN software will transmit several commands to the ST7 to initialize the processor. The practiSPIN software will read the revision code of the firmware currently stored in the flash memory of the ST7 and determine if the correct version of firmware resides in the ST7. If the practiSPIN software detects that a firmware update is necessary, either because there is an old version of firmware or the firmware currently in the flash memory is not the correct firmware for the motor type selected, one or more dialogue boxes will appear asking if the program should proceed with the update. Accept the updates and the practiSPIN software will automatically update the firmware. The system will then initialize the settings to the last stored settings and open the appropriate practiSPIN software for the selected motor type.
8. Calibrate current setting: when communication is established the user has the option to adjust the offset and maximum current settings. If this is the first time you use the system, calibration may be needed to adjust out the offset in the reference bias circuitry. Calibration ensures that the reference voltage provided to L62XX IC follows the practiSPIN software current settings. Calibration is a two-step process; first the offset is adjusted then the maximum current is set.
a) To null out the offset, click on CALIBRATE ZERO then adjust R18 (on ST7 board) until voltage at Vref pin(s) of the L62XX device is zero. Measurement points on each board are listed in the set up section for each target board.
b) The maximum current, corresponding to 100% current setting in the practiSPIN software, can be adjusted using the Vref potentiometers on the target board. If the potentiometers are set to full scale (clockwise) the reference applied to the input of the device is typically about 0.88 V. The full-scale peak current is equal to Vref/Rsense where Rsense is the composite value of the sense resistor on the board. To set the maximum current, click on CALIBRATE MAX and trim the Vref potentiometer(s) on the EVAL62XX board to set the desired reference. If you plan to use microstepping, consider reducing the maximum Vref to the real peak value you will use, allowing setting the software current controls near to 100%, avoiding poor Vref resolution.
Stepper motor drive AN1794
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3 Stepper motor drive
After the system has established the connection to the interface board, it will initialize the settings to the last stored settings and open the appropriate GUI for the selected motor type. For the Stepper motor, the system can operate in either a constant speed or positioning (indexing) mode. The constant speed mode can easily be used to see that the system is working.
3.1 Constant speed mode1. Speed control screen: a large blue button at the bottom of the screen should read,
"switch to INDEXING MODE". If the button reads, "switch to SPEED CONTROL MODE", click the button once to go to speed control mode.
2. Stepping mode: in the stepping mode box, select either Normal or Half Step. Microstepping mode is only available when using the L6208.
3. Device selection: in the device selection box, select the device being evaluated.
4. direction: in the direction box, click the toggle switch to pick forward or reverse. This is somewhat arbitrary since we probably don't know what the direction sense of the motor will be. Once the motor is running, toggle this switch to reverse the motor direction if desired. To reverse the meaning of the forward and reverse designations, disable the motor (orange disable button at bottom of screen) and then swap the motor wires at either CN3 or CN4.
5. Decay mode: only the L6208 allows the selection of fast or slow decay. Set the toggle switch to slow decay.
6. Accel rate: set the accel rate to about 1000 steps per second per second (steps/sec2). In the practiSPIN system all motion parameters are given in terms of the basic units of steps and seconds: position in steps, velocity in steps/sec, and accel/decel in steps/sec2. In order to relate these settings to rotations, RPM, and RPM/second it is necessary to know the number of steps (or half steps) per rotation for the stepper motor being used. A common value is 200 steps or 400 half steps per rotation.
7. Running speed: set running speed to about 100 steps/sec.
8. Decel rate: set decel. rate to about 1000 steps/sec2.
9. Accel current: set accel current to about 25%. This is an initial guess as to the required setting and may need further adjustment. Generally higher accel rate settings require higher accel current settings so that the stepper motor does not start to "slip poles" and fall behind the desired position. Since we have initially set the acceleration rate setting quite low, 25% is probably adequate.
10. Running current: set the running current to 25%. In practice the running current can often be set to a lower value than the accel current since the torque requirement is generally less during the constant speed part of the move. A lower running current setting can help to keep the device and the motor running cooler.
11. Decel current: set the decel current to 25%. Since friction aids in decelerating the motor it may also be possible to set the decel current lower.
12. Holding current: set the holding current to 25%. Whenever the motor is stopped (after a run,) this level of current will circulate in the motor so that it will hold position against any mechanical disturbance.
AN1794 Stepper motor drive
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In the case of a strong static load (perhaps a gravity load of some sort) it may be necessary to increase this setting. If not much holding torque is required, then the setting can be reduced so that operating temperatures can be held to a minimum.
Note: Holding current will be turned off (bridge completely disabled) whenever the disable button is clicked.
13. Run: make sure that the motor is free to turn in either direction and click the run button. The motor should quickly come up to speed ((100 steps/sec) / (1000 steps/sec2) = 0.1 sec.). To change the motor direction, click the direction toggle switch. If the motor does not run click the stop button, increase all four current settings to 50%, and click run button. If the motor still does not run an oscilloscope and current probe should be used to observe the motor current.
14. Stop: click stop to stop the motor.
After the basic operation of the system has been verified, the acceleration rates, top speed, and current settings can be adjusted to see how the motor responds.
3.2 Indexing modeThe system can be switched to operate in the positioning (indexing) mode by clicking on "switch to INDEXING MODE". In the indexing mode a new box appears on the right of the screen. You can enter up to twelve indexed movements in the box and the wait time between each movement. When started, the software will execute each movement by accelerating up to the peak speed, moving the required number of steps and then decelerating back to a stop so that the total distance moved is the number of steps indicated, then wait the indicated time before starting the next movement. A negative number entered in the relative position will cause the motor to run in the "reverse" direction.
DC motor drive AN1794
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4 DC motor drive
After the system has established the connection to the interface board, it will initialize the settings to the last stored settings and open the appropriate practiSPIN software for the selected motor type. For DC motor drive, the system operates in an open loop duty cycle control mode with cycle-by-cycle current limit.
4.1 Dual DC motor control mode1. Direction: in the direction box for each motor, click the toggle switch to pick forward or
reverse. This is somewhat arbitrary since we probably don't know what the direction sense of the motor will be. Once the motor is running, toggle this switch to reverse the motor direction if desired. To reverse the meaning of the forward and reverse designations, disable the motor (orange disable button at bottom of screen) and then swap the motor wires at either CN3 or CN4.
2. Braking: toggle the "Brake when Stop" switch to the OFF position for both motors. This will cause the motor to coast to rest when stopped, with the bridge placed in a high impedance state. If desired this function can later be toggled on but some care should be exercised. Braking will effectively short out the motor armature through two transistors in the bridge, which could cause excessive current and power dissipation if the motor and load have a large moment of inertia (thus a large amount or stored mechanical to be dissipated) or the motor has a very low resistance (resulting in a large current flow). Most smaller DC motors with several ohms of resistance do not pose a risk.
3. Current: set the current for both motors to approximately 25%. This is an initial guess as to the required setting and may need further adjustment.
4. Voltage: set the voltage for both motors to approximately 50%.
5. Run: make sure that the motors are free to turn in either direction and click the run button. the motors should come up to approximately half of the speed that would be expected at this supply voltage. To change the motor direction, click the direction toggle switch. If the motors do not run click the STOP button, increase both current settings to 50%, and click RUN button. If the motors still do not run an oscilloscope and current probe should be used to observe the motor current
6. Stop: click stop to stop the motor.
After the basic operation of the system has been verified, adjust voltage, current, direction and other parameters to evaluate the system.
AN1794 BLDC motor drive
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5 BLDC motor drive
After the system has established the connection to the interface board, it will initialize the settings to the last stored settings and open the appropriate practiSPIN software for the selected motor type. For BLDC motor drive, the system operates in an open loop duty cycle control mode with cycle-by-cycle current limit.
5.1 BLDC motor control mode1. Direction: in the direction box for each motor, click the toggle switch to pick forward or
reverse. This is somewhat arbitrary since we probably don't know what the direction sense of the motor will be. Once the motor is running, toggle this switch to reverse the motor direction if desired.
2. Braking: toggle the "Brake when Stop" switch to the OFF position. This will cause the motor to coast to rest when stopped, with the bridge placed in a high impedance state. If desired this function can later be toggled on but some care should be exercised. Braking will effectively short out the motor armature through three transistors in the bridge, which could cause excessive current and power dissipation if the motor and load have a large moment of inertia (thus a large amount or stored mechanical to be dissipated) or the motor has a very low resistance (resulting in a large current flow). Most smaller BLDC motors with several ohms of resistance do not pose a risk.
3. Current: set the current to approximately 25%. This is an initial guess as to the required setting and may need further adjustment.
4. Voltage: set the voltage to approximately 50%.
5. Run: make sure that the motor is free to turn in either direction and click the run button. The motor should come up to approximately half of the speed that would be expected at this supply voltage. To change the motor direction, click the direction toggle switch. If the motor does not run click the stop button, increase the current settings to 50%, and click run button. If the motor still does not run an oscilloscope and current probe should be used to observe the motor current.
6. Stop: click stop to stop the motor.
After the basic operation of the system has been verified, adjust voltage, current, direction and other parameters to evaluate the system.
EVAL6205N board configuration AN1794
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6 EVAL6205N board configuration
The schematic of the EVAL6205N board is shown in Figure 3. To use the EVAL6205N board with practiSPIN system, the following configuration settings must be made on the EVAL6205N:
1. Component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable):
a) To assure safe overcurrent operation: change C6 and C7 to 5.6 nF Change R5 and R6 to 100 kΩ.
b) To assure an adequate 5 V supply, R2 may need to be changed. The minimum value for R2 is (Vs-5)/(0.03+I) Ω . Where: Vs is the supply voltage and I is any additional load placed on the 5 V supply (in amps).
2. JP1: place JP1 in the INT position to enable the on-board 5 Vdc supply.
3. JP2 and JP3: install JP2 and JP3 to assure proper timing operation of the L6205's internal high side overcurrent protection.
4. JP4 and JP5: install JP4 and JP5 to configure the Vref circuits.
5. R17 & R21: adjust multi-turn trim potentiometers R17 and R21 fully clockwise.
Note: A slight click can be heard from the pot when it reaches its end of travel.
6. R23 Adjust multi-turn trim pot R23 to the middle of its range. This pot sets the frequency of the cycle-bycycle current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adjusting to raise the frequency of the audible switching noise to an inaudible level if required.
7. Motor connections: connect the motor coils at CN3 and CN4. When driving a stepper motor, one winding is connected to CN3 and the second winding is connected to CN4. For operation with 2 DC motors one motor is connected to each connector.
8. Power supply: connect, but do not energize, a 12 to 48 Vdc power supply at CN1 (positive to Vin and negative to GND).
9. Using a 34 pin ribbon cable connect the EVAL6205N board to the control interface board. The two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. Set the following on the ST7 interface board.
10. WJ1: install WJ1 on the ST7 based control interface board. This allows 5 Vdc power to be obtained from the target board.
11. JP1 and JP2 and R18: install the JP1 and JP2 jumpers to short the center and left pins together as shown in Figure 2. This is critical as excessive motor current can result from misplacement of these jumpers! Set potentiometer R18 to about 50%.
AN1794 EVAL6205N board configuration
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Figure 3. EVAL6205N schematic
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EVAL6205N board configuration AN1794
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6.1 Vref offset adjustment (R18)Using a voltmeter monitor the voltage at jumper JP4 or JP5 the EVAL6205N board with respect to GND (CN1) when calibrating the offset.
6.2 Current scalingWhen potentiometers R17 and R21 are set full clockwise, a 100% current setting on the practiSPIN software screen corresponds to a Vref of approximately 0.88 Vdc or a peak motor current of about 2.64 A.
The peak current can be set to a lower value by adjusting R17 and R21. The reference voltage inputs can be monitored at JP4 and JP5.
AN1794 EVAL6206N board configuration
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7 EVAL6206N board configuration
The schematic of the EVAL6206N board is shown in Figure 4. To use the EVAL6206N board with practiSPIN system, the following configuration settings must be made on the EVAL6206N:
1. Component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable):
a) To assure safe overcurrent operation:
– Change C6 and C7 to 5.6 nF
– Change R5 and R6 to 100 kΩb) To assure an adequate 5 V supply, R2 may need to be changed. The minimum
value for R2 is (Vs-5)/(0.03+I) Ω . Where: Vs is the supply voltage and I is any additional load placed on the 5 V supply (in amps).
2. JP1: place JP1 in the INT position to enable the on-board 5 Vdc supply.
3. JP2 and JP3: install JP2 and JP3 to enable the L6206's internal high side overcurrent protection.
4. JP4 and JP5: install JP4 and JP5 to set internal overcurrent threshold to maximum. If desired, these jumpers can be left out and the overcurrent levels may be set using potentiometers R7 and R8.
5. JP6 and JP7: install JP6 and JP7 to configure the Vref circuits.
6. R20 and R26 adjust multi-turn trim pots R20 and R26 fully clockwise.
Note: A slight click can be heard from the pot when it reaches its end of travel.
7. R29: adjust multi-turn trim pot R29 to the middle of its range. This pot sets the chopping frequency of the L6506 current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adjusting to raise the frequency of the audible switching noise to an inaudible level if required.
8. Motor connections: connect the motor coils at CN3 and CN4. When driving a stepper motor, one winding is connected to CN3 and the second winding is connected to CN4. For operation with 2 DC motors one motor is connected to each connector.
9. Power supply: connect, but do not energize, a 12 to 48 Vdc power supply at CN1 (positive to Vin and negative to GND).
10. Using a 34 pin ribbon cable connect the EVAL6205N board to the control interface board. The two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. Set the following on the ST7 interface board.
11. WJ1: install WJ1 on the ST7 based Control Interface Board. This allows 5 Vdc power to be obtained from the target board.
12. JP1 and JP2 and R18: install the JP1 and JP2 jumpers to short the center and left pins together as shown in Figure 2. This is critical as excessive motor current can result from misplacement of these jumpers! Set potentiometer R18 to about 50% .
EVAL6206N board configuration AN1794
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Figure 4. EVAL6206 schematic
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AN1794 EVAL6206N board configuration
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7.1 Vref offset adjustment (R18)Using a voltmeter monitor the voltage at jumper JP6 or JP7 the EVAL6206N board with respect to GND (CN1) when calibrating the offset.
7.2 Current scalingWhen potentiometers R20 and R26 are set full clockwise, a 100% current setting on the practiSPIN software screen corresponds to a Vref of approximately 0.88 Vdc or a peak motor current of about 2.64 A.
The peak current can be set to a lower value by adjusting R17 and R21. The reference voltage inputs can be monitored at JP6 and JP7.
EVAL6206PD board configuration AN1794
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8 EVAL6206PD board configuration
The schematic of the EVAL6206PD board is shown in Figure 5. To use the EVAL6206PD board with practiSPIN system, the following configuration settings must be made on the EVAL6206PD:
1. Component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable):
a) To assure safe overcurrent operation:
– Change C6 and C7 to 5.6 nF
– Change R4 and R5 to 100 kΩb) To assure an adequate 5 V supply, R1 may need to be changed. The minimum
value for R1 is (Vs-5)/(0.03+I) Ω . Where: Vs is the supply voltage and I is any additional load placed on the 5 V supply (in amps).
2. JP1: place JP1 in the INT position to enable the on-board 5 Vdc supply.
3. JP2 and JP3: install JP2 and JP3 to enable the L6206's internal high side overcurrent protection.
4. JP4 and JP5: install JP4 and JP5 to set internal overcurrent threshold to maximum. If desired, these jumpers can be left out and the overcurrent levels may be set using potentiometers R6 and R7.
5. R16 and R22: adjust multi-turn trim pots R16 and R22 fully clockwise.
Note: A slight click can be heard from the pot when it reaches its end of travel.
6. R25 Adjust multi-turn trim pot R25 to the middle of its range. This pot sets the chopping frequency of the L6506 current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adjusting to raise the frequency of the audible switching noise to an inaudible level if required.
7. Motor connections: connect the motor coils at CN3 and CN4. When driving a stepper motor, one winding is connected to CN3 and the second winding is connected to CN4. For operation with 2 DC motors one motor is connected to each connector.
8. Power supply: connect, but do not energize, a 12 to 48 Vdc power supply at CN1 (positive to Vin and negative to GND).
9. Using a 34 pin ribbon cable connect the EVAL6205N board to the control interface board. The two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across.
Set the following on the ST7 interface board
WJ1: Install WJ1 on the ST7 based control interface board. This allows 5 Vdc power to be obtained from the target board.
JP1 and JP2 and R18: install the JP1 and JP2 jumpers to short the center and left pins together as shown in Figure 2. This is critical as excessive motor current can result from misplacement of these jumpers! Set potentiometer R18 to about 50%.
AN1794 EVAL6206PD board configuration
19/34
Figure 5. EVAL6206PD schematic
R2
4
CN
4
12
C6
C3
CN
1
12
TINA1 P
2.4
R7
PR
OG
CLA
VR
EF
_A
_4
_2
IN2
SE
NS
E_A
R9
JP5
EN
ATI
NA0
P2.0
OC
DA
C11
R1
R1
9
R4
C13
CW
R6
C14
OCMPA1
P4.2
R14
PR
OG
CLB
A0IN6
P7.6
CW
_2
ext.
R18
R2
1
VR
EF
_B
VR
EF
A
INT2
C12
OC
DB
PR
OG
CLB
R2
0
_1
VC
CR
EF
R11
int.
TOUTB0
P2.3
R5
R1
7
C2
Pul
lUp
D1
13
2
R15
TINB1
P2.5
R22
Pul
lUp
SE
NS
E_A
EN
B
CN
2
1 2
SE
NS
E_B
L6206PD
JP4
SENSE_A
SENSE_B
IN3
VR
EF
B
INT6
JP2
EN
B
C1
CW
Pul
lUp
INT3
Pul
lUp
JP3
R26
Pul
lUp
INT0
R2
CN
3
1 2
R13
IN1
TOUTA1
P2.6
CW
R16
ADC_RE
F
C15
IN4
R3
IN1
_4
Pul
lUp
C9
EN
A
TINB0
P2.1
Pul
lUp
CW
C8
IN2
R12
C5
_1
R10
C10
+5V
IN3
OC
DA
OCMPB1
/ICAPB
1 P4.3
+5V
CN
5
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34
SE
NS
E_B
C4
PR
OG
CLA
IN4
_3
R25
JP1
13
2
OC
DB
A1IN6
P8.1
D2
_3
U2
5
6
7
8
161514134
17
19
12
1
18 3
20
2
91011
In1
In2
In3
In4
Out1Out2Out3Out4
EN
Vsense2
Vref2
Vsense1
R/C
Vref1 Sync
VC
C
Osc_Out
GN
DN
CN
C
U1
36
10
1
12
30
11
18
33
19
9
26
4
7 28
298 27
24
13
15
25
22
5 32
2 3 6 14
16
17
20
21
23
31
34
35
GND
IN1
GND
SENSEA
VBOOT
IN2
GND
VSB
GND
PROGCLA
IN3
VSA
VCP PROGCLB
EN
B
EN
A
IN4
OCDB
OCDA
OU
T1A
SENSEB
OU
T1B
OU
T2A
OU
T2BNC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
TOUTPB1
2.7
STMicro
elec
tronic
s In
dustri
al&Pow
er Sup
ply Ap
plicat
ion LA
B
C7
R8
R23
EVAL6206PD board configuration AN1794
20/34
8.1 Vref offset adjustment (R18)Using a voltmeter monitor the voltage at the junction of R12 and R16 or the Junction of R20 and R22 on the EVAL626PD board with respect to GND (CN1) when calibrating the offset.
8.2 Current scalingWhen potentiometers R16 and R22 are set full clockwise, a 100% current setting on the practiSPIN software screen corresponds to a Vref of approximately 0.88 Vdc or a peak motor current of about 4.4 A. The peak current can be set to a lower value by adjusting R16 and R22.
AN1794 EVAL6207N board configuration
21/34
9 EVAL6207N board configuration
The schematic of the EVAL6207N board is shown in Figure 6. To use the EVAL6207N board with practiSPIN system, the following configuration settings must be made on the EVAL6207N:
1. Component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable):
a) To assure safe overcurrent operation:
– Change C6 and C7 to 5.6 nF
– Change R3 and R4 to 100 kΩb) To assure an adequate 5 V supply, R2 may need to be changed. The minimum
value for R2 is (Vs-5)/(0.03+I) Ω . Where: Vs is the supply voltage and I is any additional load placed on the 5 V supply (in amps).
2. JP1: place JP1 in the INT position to enable the on-board 5 Vdc supply.
3. JP2 and JP3: install JP2 and JP3 to assure proper timing operation of the L6207's internal high side overcurrent protection.
4. R15 and R18: adjust multi-turn trim pots R15 and R18 fully clockwise.
Note: A slight click can be heard from the pot when it reaches its end of travel.
5. R6 and R7: adjust multi-turn trim pots R6 and R7 to the middle of their range. These pots set the off time of the cycle by cycle current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adjusting to raise the frequency of the audible switching noise to an inaudible level if required.
6. motor connections: connect the motor coils at CN3 and CN4. When driving a stepper motor, one winding is connected to CN3 and the second winding is connected to CN4. For operation with 2 DC motors one motor is connected to each connector.
7. Power supply: connect, but do not energize, a 12 to 48 Vdc power supply at CN1 (positive to Vin and negative to GND).
8. Using a 34 pin ribbon cable connect the EVAL6207N board to the control interface Board. The two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. Set the following on the ST7 interface board
9. WJ1: install WJ1 on the ST7 based Control Interface Board. This allows 5 Vdc power to be obtained from the target board.
10. JP1 and JP2 and R18: install the JP1 and JP2 jumpers to short the center and left pins together as shown in Figure 2. This is critical as excessive motor current can result from misplacement of these jumpers! Set potentiometer R18 to about 50%.
EVAL6207N board configuration AN1794
22/34
Figure 6. EVAL6207N schematic
R2
L6207
Pul
lUp
C4
ADC_R
EF
VR
EFB
VC
CR
EF
EN
A
LIM
IT_A
GN
D
IN1
IN2
R11
R1
5
C1
0
R13
LIM
ITB
C8
OCMPA
0/ICAPA0 P3.2
CW
C5
EN
B
VR
EF
B
A0IN6
P7.6
JP2
LIM
IT_B
R6
R8
IN2
SE
NS
E_A
R14
IN3
U1
1 2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
IN1A
IN2A
SENSEA
RCA/INH
OU
T1
A
GND
GND
OU
T1
B
RCB
SENSEB
IN1B
IN2B
VREF B
EN
B
VBOOT
OU
T2
B
VSB
GND
GND
VSA
OU
T2
A
VCP
EN
A
VREF A
C6
OCMPA
1 P4.2
R7
D3
Pu
llUp
R1
CN
1
12
CN
4
12
CW
VC
CR
EF
D1
LIM
IT_A
INT0
R5
RC
A/IN
H
VR
EF
A
CN
5
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34
CW
Pul
lUp
INT2
SE
NS
EA
D2
IN3
TINPAO P2.0
C7
IN4
C2
VR
EF
_A
ext.
C3
TOUTA1 P2.6
EN
B
EN
A
C1
R1
8
LIM
IT_B
R12
TOUTB1 P2.7
R3
int.
IN1
JP1
13
2
R9
+5V
JP3
TOUTAO P2.2
LIM
ITA
CN
2
1 2
C1
1
VR
EF
_B
RC
A/IN
H
+5V
CN
3
1 2
C9
LIM
IT_B
A1IN6
P8.1
IN4
SE
NS
EB
R1
6
R1
7
LIM
IT_A
OCMPB
0 P3.3
OCMPB
1/ICAPB1 P4.3
R4
VR
EFA
SE
NS
E_B
R10
TINPB0 P2.1
AN1794 EVAL6207N board configuration
23/34
9.1 Vref offset adjustment (R18)Using a voltmeter monitor the voltage at the VrefA or VrefB test point on the EVAL6207N board with respect to GND (CN1) when calibrating the offset.
9.2 Current scalingWhen potentiometers R20 and R26 are set full clockwise, a 100% current setting on the practiSPIN software screen corresponds to a Vref of approximately 0.88 Vdc or a peak motor current of about 2.64 A.
The peak current can be set to a lower value by adjusting R15 and R18. The reference voltage inputs can be monitored at the VrefA or VrefB test point.
EVAL6208N board configuration AN1794
24/34
10 EVAL6208N board configuration
The schematic of the EVAL6208N board is shown in Figure 7. To use the EVAL6208N board with practiSPIN system, the following configuration settings must be made on the EVAL620A:
1. Component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable):
a) To assure safe overcurrent operation:
– Change C6 to 5.6 nF
– Change R9 to 100 kΩb) To assure an adequate 5 V supply, R2 may need to be changed. The minimum
value for R2 is (Vs-5)/(0.03+I) Ω . Where: Vs is the supply voltage and I is any additional load placed on the 5 V supply (in amps).
2. JP1: place JP1 in the INT position to enable the on-board 5 Vdc supply.
3. Switches place all four of the switches in the right (toward the L6208) position.
4. R20 and R24: adjust multi-turn trim pots R20 and R24 fully clockwise.
Note: A slight click can be heard from the pot when it reaches its end of travel.
5. R11 and R12: adjust multi-turn trim pots R11 and R12 to the middle of their range. These pots set the off time of the cycle by cycle current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adjusting to raise the frequency of the audible switching noise to an inaudible level if required.
6. Motor connections: connect the motor coils at CN3 and CN4. When driving a stepper motor, one winding is connected to CN3 and the second winding is connected to CN4. For operation with 2 DC motors one motor is connected to each connector.
7. Power supply: connect, but do not energize, a 12 to 48 Vdc power supply at CN1 (positive to Vin and negative to GND).
8. Using a 34 pin ribbon cable connect the EVAL6208N board to the control interface Board. The two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. Set the following on the ST7 interface board.
9. WJ1: install WJ1 on the ST7 based control interface board. This allows 5 Vdc power to be obtained from the target board.
10. JP1 and JP2 and R18: install the JP1 and JP2 jumpers to short the center and left pins together as shown in Figure 2. This is critical as excessive motor current can result from misplacement of these jumpers! Set potentiometer R18 to about 50%.
AN1794 EVAL6208N board configuration
25/34
Figure 7. EVAL6208N schematic
Pul
lUp
R1
0
int.
CW
R2
CL
OC
K
VR
EF
A
CW
/CC
W
EN
R14
VR
EF
B
R19
R9
C6
D2 R
12
R3
EN
CW
GN
DP
ullU
p
C2
CN
1
12
VR
EF
B
Pu
llUp
S1
9
11
16
8
1
15
10
14
2
13
3
12
4
5
6
7
CN
4
12
DIA
GC
N5
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33
2 4 6 81
01
21
41
61
82
02
22
42
62
83
03
23
4
R4
CO
NT
RO
L
Pul
lUp
R5
CL
OC
K
C4
RC
A
CW
R1
R21
CW
/CC
WC
9
RE
SE
T
R15
C7
CL
OC
K
CLO
CK
FAST
R7
VC
CR
EF
Pul
lUp
C1
R2
0
SLOW
D1
JP1
13
2
DIA
G
RC
A
+5V
CN
2
1 2
CW
VR
EF
A
FULL
R17
DIA
G
CO
NTR
OL
C5
HA
LF
/FU
LL
D3
R1
1
VR
EF
B
HALF R22
R8
R2
4
C8
RC
B
L6208N
R6
C1
0
R1
3
U1
3
4
1
9
13
24
2
11
10
14 2312
5
6
7
8
15
16
17
18
19
20
21
22
SENSEA
RCA
CLO
CK
RCB
CO
NT
RO
L
VREF A
CW
/CC
W
VREFB
SENSEB
EN
RE
SE
T
HA
LF/F
ULL
OU
T1A
GND
GND
OU
T1B
VBOOT
OU
T2B
VSB
GND
GND
VSA
OU
T2A
VCP
CN
3
1 2
VR
EF
A
HA
LF/F
ULL
ext.
R16
EN
CW
R18
Pul
lUp
+5V
RE
SE
T
CCW
RC
A
Pul
lUp
C3
EVAL6208N board configuration AN1794
26/34
10.1 Vref offset adjustment (R18)Using a voltmeter monitor the voltage at the VrefA or VrefB test point on the EVAL6208N board with respect to GND (CN1) when calibrating the offset.
10.2 Current scalingWhen potentiometers R20 and R21 are set full clockwise, a 100% current setting on the practiSPIN software screen corresponds to a Vref of approximately 0.88 Vdc or a peak motor current of about 2.64 A.
The peak current can be set to a lower value by adjusting R15 and R18. The reference voltage inputs can be monitored at the VrefA or VrefB test point
After tube recognition the microcontroller will set the right run frequency for the connected lamp.
AN1794 EVAL6208PD board configuration
27/34
11 EVAL6208PD board configuration
The schematic of the EVAL6208PD board is shown in Figure 8. To use the EVAL6208PD board with practiSPIN system, the following configuration settings must be made on the EVAL6208PD:
1. Component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable):
a) To assure safe overcurrent operation:
– Change C12 to 5.6 nF
– Change R21 to 100 kΩb) To assure an adequate 5 V supply, R1 may need to be changed. The minimum
value for R1 is (Vs-5)/(0.03+I) Ω . Where: Vs is the supply voltage and I is any additional load placed on the 5 V supply (in amps).
2. JP1: place JP1 in the INT position to enable the on-board 5 Vdc supply.
3. Switches: place all four of the switches in the right (toward the L6208) position.
4. R8 and R17: adjust multi-turn trim pots R8 and R17 fully clockwise.
Note: A slight click can be heard from the pot when it reaches its end of travel.
5. R10 and R11: adjust multi-turn trim pots R10 and R11 to the middle of their range. These pots set the off time of the cycle by cycle current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adjusting to raise the frequency of the audible switching noise to an inaudible level if required.
6. Motor connections: connect the motor coils at CN3 and CN4. When driving a stepper motor, one winding is connected to CN3 and the second winding is connected to CN4. For operation with 2 DC motors one motor is connected to each connector.
7. Power supply: connect, but do not energize, a 12 to 48 Vdc power supply at CN1 (positive to Vin and negative to GND).
8. Using a 34 pin ribbon cable connect the EVAL6208PD board to the control interface board. The two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. Set the following on the ST7 interface board.
9. WJ1: install WJ1 on the ST7 based control interface board. This allows 5 Vdc power to be obtained from the target board.
10. JP1 and JP2 and R18: install the JP1 and JP2 jumpers to short the center and left pins together as shown in Figure 2. This is critical as excessive motor current can result from misplacement of these jumpers! Set potentiometer R18 to about 50%.
11.1 Vref offset adjustment (R18)Using a voltmeter monitor the voltage at the VrefA or VrefB test point on the EVAL6208PD board with respect to GND (CN1) when calibrating the offset.
11.2 Current scalingWhen potentiometers R8 and R17 are set full clockwise, a 100% current setting on the practiSPIN software screen corresponds to a Vref of approximately 0.88 Vdc or a peak motor current of about 4.4 A. The peak current can be set to a lower value by adjusting R15 and R18. The reference voltage inputs can be monitored at the VrefA or VrefB test point.
EVAL6235 board configuration AN1794
30/34
12 EVAL6235 board configuration
The schematic of the EVAL6235 board is shown in Figure 9. To use the EVAL6235 board with practiSPIN system, the following configuration settings must be made on the EVAL6235:
1. Component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable):
a) To assure safe overcurrent operation:
– Change C6 and C7 to 5.6 nF
– Change R6 to 100 kΩ and remove R2
b) To assure an adequate 5 V supply, R1 may need to be changed. The minimum value for R1 is (Vs-5)/(0.03+I) Ω . Where: Vs is the supply voltage and I is any additional load (such as Hall sensors) placed on the5 V supply (in amps).
2. JP1 and JP2: install JP1 and JP2 to enable the on-board 5 Vdc supply.
3. Switches: place all four switches in the down (away from U2) position.
4. R22: adjust multi-turn trim pot R22 fully clockwise.
Note: A slight click can be heard from the pot when it reaches its end of travel.
5. R10: adjust multi-turn pot R10 to the middle of its range. This pot sets the off time of the cycle by cycle current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adjusting to raise the frequency of the audible switching noise to an inaudible level if required.
6. Hall sensors: connect the hall sensors of the BLDC motor at CN5. Connect the power supply wires from the hall sensors at pins GND and P5V. Hall sensors are notorious for being destroyed by reversed polarity! Know, don't guess, the proper polarity! Connect H1, H2, and H3 signals to their respective pins.
7. Motor connections: connect the three motor armature wires at CN3 being careful to match the phasing to the hall sensor connections. Please refer to the L6235 data sheet for a description of the proper phase relationship between the motor phases and the Hall sensors.
Note: There are six possible ways to connect the three armature wires to CN3. While only one connection will give proper performance, one or two of the other possible connection may cause the motor to turn but with very poor performance and, perhaps, high motor currents even if the system is unloaded.
8. Power supply: connect, but do not energize, a 12 to 48 Vdc power supply at CN1 (positive to Vin and negative to GND).
9. Using a 34 pin ribbon cable connect the EVAL6208PD board to the control interface board. The two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. Set the following on the ST7 interface board.
10. WJ1: install WJ1 on the ST7 based control interface board. This allows 5 Vdc power to be obtained from the target board.
11. JP1 and JP2 and R18: install the JP1 and JP2 jumpers to short the center and left pins together. This is critical as excessive motor current can result from misplacement of these jumpers! Set potentiometer R18 to about 50%.
AN1794 EVAL6235 board configuration
31/34
Figure 9. EVAL6235 schematic
R2
TP
EN
ABL
E
A0IN6 P
7.6
R5
H3
ADC_REF
H1
PullU
p
VR
EF
CW
R7
C5
R12
C9
R4
SEN
SE
P2.6
S1
9
11
16
8
1
15
10
14
2
13
3
12
4
5
6
7
P3.1
R21
C3
P2.1
OCMPA1 P4.2
VR
EF
VC
CR
EF
C1
R6
U1
L623
5
5
3
16
4
21
8
1
2
9
13
2311
10
14 2412
6
7
15
17
18
19
20
22
OUT
1
SENSE1
OUT
3
RCOFF
OUT
2
TACHO
H1
DIAG
RCPULSE
VREF
H2
FWR/
REW
SENSE2
BRAK
E
H3
ENAB
LE
GND
GND
VBOOT
VSB
GND
GND
VSA
VCP
BRA
KE
CN1 12
FRW
/REW
INT2
+ -
U2B
LM35
8
5 67
8 4
PullU
p
H2
C8
C10
INT3
TP
C12
R1 P2
.2
C11
R13
+5V
Pul
lUp
D3
FWR
9
+5V
H1
+5V
H1
TINA
0 P2.
0
CN
4
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34
REV
L6235
CW
R17
H3
R11
R16
R22
P2.4
BRAKE
TP
C6
CN
3
1 2 3
C7
RC/
INH
+5V
HALL CON
CW
C2
R3
ENA
BLE
DIA
G
CN
2
1 2
P2.5
Pul
lUp
R10
R14
BR
AKE
H2
D1
R19
P2.7
R8
+5V
VCCR
EF
ENH
1
R15
DIA
G
+-
U2A
LM35
8
321
84
Pullu
p
TRQ
C4
H2
R18
R20
JP2
H3
D2
CN5 1 2 3 4 5
JP1
FRW
/REV
SPEED
EVAL6235 board configuration AN1794
32/34
12.1 Vref offset adjustment (R18)Using a voltmeter monitor the voltage at the junction of R17 and R20 on the EVAL6235N board with respect to GND (CN1) when calibrating the offset.
12.2 Current scalingWhen potentiometer R22 is set full clockwise, a 100% current setting on the practiSPIN software screen corresponds to a Vref of approximately 0.88 Vdc or a peak motor current of about 4.4 A. The peak current can be set to a lower value by adjusting R22. The reference voltage inputs can be monitored at the junction of R17 and R20.
AN1794 Revision history
33/34
13 Revision history
Table 1. Document revision history
Date Revision Changes
21-Jun-2004 1 Initial release
29-Jan-2008 2 Document reformatted. No content change
AN1794
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