Page 1 Digital Proportional Remote Controller Digital proportional Remote Controller Application Notes 查询PT8A995P供应商 捷多邦,专业PCB打样工厂,24小时加急出货
Page 1
Digital Proportional Remote Controller
Digital proportional Remote Controller
Application Notes
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查询PT8A995P供应商 捷多邦,专业PCB打样工厂,24小时加急出货
Page 2
Digital Proportional Remote Controller
Why proportional controlSimple action control
Left:no turn, full left turnForward:stop, low-speed, high-speed(100% full)
a
R
R
R
Proportional control
a2
a1
a3
R1
R2
R3
Left turn wheel:0 center, 1 degree, 2 degree…Forward:0 stop, 1%, 2%… 100%
Example:PT8A977/978…(Forward, backward, left, right, turbo…)
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Page 3
Digital Proportional Remote Controller
Two CH Digital proportional control
5 bit data for proportional
-15, -14, -13, … -2, -1, 0,
1, 2, 3, … 13, 14, 15
01
23
456
789101112131415
-1-2
-3-4-5-6
-12
-9-11
-10
-8 -7
-15 -14 -13
SYNC + CH1 + CRC1 + CH2 + CRC2
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Page 4
Digital Proportional Remote Controller
Two CH Analog proportional control
CH1
CH2
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Page 5
Digital Proportional Remote Controller
Traditional proportional control
Servo Controller and Servo Motor
Servo Controller and Servo Motor
RF ReceiverRF Receiver
Electronic Speed Controller
Electronic Speed Controller
BatteriesBatteries
Antenna Antenna
Speed MotorSpeed Motor
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Page 6
Digital Proportional Remote Controller
PT8A995/996
Overview
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Page 7
Digital Proportional Remote Controller
Receiver IC ----- PT8A996Integrated servo controller (except power transistor)
Integrated speed controller (except power transistor)
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Page 8
Digital Proportional Remote Controller
Transmitter IC ------ PT8A995code, modulation, RF Amp
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Page 9
Digital Proportional Remote Controller
F/BL/RF1F2offset1offset2
PT8A995
RFfilter
F/BL/RF1F2offsetFB
PT8A995
RFreceiver
• PT8A995 works as encoder and PT8A996 works as decoder
• Two Digital Proportional channels, 5Bit resolution ratio (+/-15 steps)
• Two Fine-tuning for Digital Proportional channels (offset +/- 3 steps)
• Tow nominal control channels
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Page 10
Digital Proportional Remote Controller
• Build-in 5bit AD convector
• Using Manchester code with out DC offset
• Build-in DPLL for data Sample to improve bit error rate
• Tow motors over-load protection to meet HD271 safetyspecification
• One Attach pin compatible Futaba S3003 servo set
• Few external components needed
• Built-in voltage regulator (996P)
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Page 11
Digital Proportional Remote Controller
• Build-in complete RF circuit (995P)
• Build-in RF low voltage PA, 6V, 50mW @27MHz (995P)
• Build-in tow stage amplifies to improve sensitivity (996P)
• Base band signal sensitivity overmatch 5mVpp (996P)
• With super-regenerative RF sensitivity overmatch –100dbm (996P)
• One complete closed loop adjustment for servo motor (996P)
• One open loop adjustment for motor speed (996P)
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Page 12
Digital Proportional Remote Controller
OscillatorTiming
Generator
PowerOn
AD
Encoder&
LogicControl
RFOsc
OSCIOSCO
SCCA1CA2
F/BL/R
OFFSET1OFFSET2
Reset
VDD
RFout
PC
SCF1
F2IRout
PT8A995 Block Diagram
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Page 13
Digital Proportional Remote Controller
MUX A/D
F/B
L/R
Offset1
Offset2
SA
CLK
D0D1D2D3D4
Internal A/D Converter of PT8A995P
• F/B, L/R Proportional channels, 5Bit resolution ratio (+/-15 steps)
• Two Fine-tuning (offset1, offset2) for Digital Proportional channels (+/- 3 steps)
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Page 14
Digital Proportional Remote Controller
VDD VDD
1M
200K
1M
Offset1/2
Offset balance resistor PT8A995P
• Independence offset input compliant 2-channel pistol grip radio
• Internal base when using machine Fine trims for two-stick radio
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Page 15
Digital Proportional Remote Controller
SA81/128VDD1/2VDD47/128VDD
00000
1000001111
11111
QAZ
Analog Voltage and Digitized Values
• Input Range is ¼ Vdd(-15 ~ +15 step)
• Central point is ½ Vdd
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Page 16
Digital Proportional Remote Controller
0 1 1 1 1 1 1 0 1 1 1 FB4 FB3 0 FB2-FB0 F1 F3 0 CRC
0 1 1 1 1 1 1 0 0 0 0 RL4 RL3 0 RL2-RL0 F2 F4 0 CRC
Odd Frame
Even Frame
Notes:FB4-FB0: F/B values;RL4-RL0: R/L values;F2-F1: function value;F4/F3 are reserved
Encoder
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Page 17
Digital Proportional Remote Controller
Manchesterbase band code
OriginalData Code
Manchester base band code scheme
• Using Manchester code without DC offset
• Manchester code have enough edges for receiver recover clock
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Page 18
Digital Proportional Remote Controller
• Integrated modulation RF circuit for easy application• Can use fundamental crystal or third-tune crystal• The RF frequency can be 27MHz or 49MHz• Low voltage RF PA for 6V Batteries power supply
Internal RF Modulation (AMK)
SC
RFOUT
CA1
CA2
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Page 19
Digital Proportional Remote Controller
PT8A996 Block Diagram
OSCI
OSCOOSC
VT1
ADSRV
SI
CurrentLimiter
SerialTo
Parallel
TimingGenerator
Filter
PWM&
Logic
DPLLLeftForward
F2
Right
BackwardF1
VI1 VI2VO1 VO2
VCC VrefREF
VT2
CRCCheck
FC
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Page 20
Digital Proportional Remote Controller
• The base-band signal is amplified in two stages amplifier.• With external RC build a band-pass filter to reduce noise.
Amplify (PT8A996)
VI1 VO1 VI2 VO2 SI
A(f)
40dB
500HZ 4kHzf
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Page 21
Digital Proportional Remote Controller
DPD
Up-
Counter
N-Counter
Down-
Counter
151kHz
SI-F CLK=1.18kHz
2.37kHzDPLL (PT8A996)
• DPLL recover clock from base band signal• Use DPLL out Sample the data
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Page 22
Digital Proportional Remote Controller
• VT1 and VT2 Pin is use for Over-load protection
• Use Rs detect Motor current
• Once VT keeps effective more than Te and ineffective less than Tm,
the chip enters over-load protection mode. It will disable all output.
Motor Over-Load Protection
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Page 23
Digital Proportional Remote Controller
Application Circuit
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Page 24
Digital Proportional Remote Controller
X127M
X2455K
F2B1
F1B2
IROUT3
GND4
RFout5
CA16
CA27
SC8
OFFSE19
OFFS210
VDD11
OSCo12
OSCi13
F/B14
L/R15
PC16
IC1
PT8A995
C9
20p
C10
20p
SW
R9
1K
LED BAT
4-6v
C110.1u
RV2
5.1k
RV1
5.1k
C14
CS
0.1u
CI33p
RO
20kCO33p
F2
F1
C01
240 C02150p
C0315p C06
47p
C05120p
C04
39p
L01
0.27
L02
0.22uL03
0.36u
L04
2.4u
C07
27p
ANT
D1IN4148
Vdd
Vdd
Vdd
LOSC
3u
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Page 25
Digital Proportional Remote Controller
X127M
X2455K
F2B1
F1B2
IROUT3
GND4
RFout5
CA16
CA27
SC8 OFFSE1 9
OFFS2 10
VDD 11
OSCo 12
OSCi 13
F/B 14
L/R 15
PC 16IC1
PT8A995
C920p
C1020p
SW
R93k
LED
BAT
7.2-12V
C110.1u
RV25k
RV15k
ANT
Q1
L21.5mH
C1
68pC2150p
C415n
C31n
R210
C668p
C14
CS0.1u
CI33p
Vin 1
GN
D2
Vout3
V178L05
RO
20k
CO33p
F2
F1
Vdd
VRF
RE1
51
CE
430p
Q29018
RB21K
CF0.15u
RF
330
RB11K
Vdd
Vdd
Vdd
VRF
LOSC
3uH
RE2
51
CP4.7u
L1BLA
3.3u
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Page 26
Digital Proportional Remote Controller
A1
C110p
VT1C945
C227p
L18.2u
C33300p
C44.7u
C50.01u
C627p
L2
R1560p
R222k
R43.3k
R322k
VT2C380
R5430
R6470
C7100p
R710k
R810k
C80.1u
L34.7u
R10200
C140.01u
C150.01u
G1455k
R11*
Left
Right
Back
For
VT1VCC2
SI
C16 470p
C90.1u
C17330p
C184700p
R12 2.2MR14
2.2k
R13 2.2M
R15 2.2k
C19 0.1u
R162.2k
VCC2
FORWD1
BACKWD 2
RIGHT3
LEFT4
GND 5
VT26
VT17
VO2 8
VI29
VO1 10VI111
FC12
SI13
VDD14
OSCO15
OSCI16
SRV17
PC18
F119
F220
IC1
PT8A996
R175k
C20
150p
R185k
FeedBack
SI
R19
2k
R23300
R24300
R290.2
VT3IRFZ48N
VT4
IRFZ48N
VT5
IRF4905
VT6IRF4905
C100.1u
VT78050 VT8
8050VT98050 VT10
8050
R25300
R202k
R26300
BackForR303k
R313k
VT1
M1
R32110
C21100uC11
0.1u
C120.1u
C22470u
VCC2 L422u
D1NJM431
R910k
R3316k
B1
3.6v
SW1
B2
3.6v
VCC1
VCC1
VCC2
F1 Function Loading
F2 Function Loading
VT118050
VT128050
VT13BD237
VT14BD237
R212k
R27300
R28300
R22
2k
VT15BD238
VT16BD238
C130.1u
Left Right
M2
VCC1
R34
1.3kC23
4.7u
C24
150p
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Page 27
Digital Proportional Remote Controller
G1
455k
R1
0~5k
Left
Right
Back
For
VT1VCC2
SI
C1
0.1u
C4330p
C54700p
R2 2.2M
R32.2k
VCC2
FORWD1
BACKWD 2
RIGHT 3
LEFT 4
GND5
VT2 6
VT1 7
VO2 8
VI29
VO1 10VI111
OFFSET12
SI13
VDD14
OSCO15
OSCI16
SRV17
PC18
F119
F220
IC1
PT8A996
R45k
C6
150p
R55k
FeedBack
SI
VT18050
VT28050
VT7BD237
VT8BD237
R62k
R10300
R11300
R7
2k
VT9BD238
VT10BD238
C20.1u
Left Right
M1Motor1
R82k
R12300 R13
300
R160.2
VT11IRFZ48N
VT12
IRFZ48N
VT13IRF4905
VT14IRF4905
C30.1u
VT38050 VT4
8050VT58050 VT6
8050
R14300
R92k
R15300
BackForR173k
R183k M2
Motor2
R19110
C7100uC8
0.1u
C90.1u
C10
470u
VCC2 L122u
D1NJM431
R2010k
R2116k
B13.6v
SW1
Switch
B23.6v
VCC1
VCC1
VCC1
VCC2
F1 Function Loading
F2 Function Loading
R226.8k
R232.7k
R25120
R26220
C1127p
C120.01u
C150.01u C17
20pC14680p
C160.01u
C183-10p
C190.047u
C203.3u
C21
180pL2
5.1u
T11.2u
T32u
L32.2u
A1
G227M
T2 FL1455k
1
3
5 6
78
1011
13PT8A201WVT159018
VCC2
VCC2
70
827
D41N60
D31N60
IC2
R27510
VT1 R28
1.3kC22
47u
D61N4148
C23
150p
D21N60
D51N60
R242.2k
C13 0.1u
T1 T2
6:10
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