Galvanic Isolation & RS485 Triad Semiconductor - The Configurable Mixed Signal ASIC Company
Galvanic isolation & Triad Semiconductor Mixed-Signal ASIC Solutions
Jun 22, 2015
Galvanic isolation is used in a variety of medical and industrial applications to isolation a circuit at a high voltage potential from a circuit at a low voltage potential. This isolation prevents excessive voltages from either circuit from reaching the other circuit. This presentation outlines a semiconductor transformer method developed by the AMS foundry to place transformers in silicon on to achieve such isolation between two CMOS high-voltage die in the same plastic package. This capability is available from Triad Semiconductor and AMS.
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Galvanic Isolation & RS485
Triad Semiconductor - The Configurable Mixed Signal ASIC Company
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Galvanic Isolation
Galvanic isolation contained in IC1- IC2 ground at 450V- IC1 ground at 0V
Inductive coupling of signals between IC2 and IC1
Isolation Coils (transformer) can be built in various device layers
Signals in IC1 and IC2 are modulated before transmission across the Galvanic Transformer
Page 2
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Galvanic Isolation Capabilities
Inductive coupling between layers
Continuous10 y / 150 C / 10ppm
Transient100s / 150 C / 10ppm
Metal-1 to Metal-3 207Vrms, 290VDC 2.1kVrms
Substrate to Metal-3 300Vrms, 423VDC 3.0kVrms
Metal-1 to Metal-4 330Vrms, 465VDC 3.3kVrms
Substrate to Metal-4 420Vrms, 590VDC 4.2kVrms
Page 3
Galvanic isolation guidelines for inductive coupling between different process layers.
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Galvanic Isolation Encode / Decode
Signals encoded (modulated) to allow for transmission though the inductive loop
Signals decoded (demodulated) after inductive loop to baseband and DC signals
Page 4
Low-Side VCA Die High-Side VCA Die
Encode
GalvanicIsolationInductive
Coil
Decode
GalvanicIsolationInductive
Coil
Encode Decode
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Galvanic Isolation within a System-In-Package Solution
Page 5
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RS-485 Overview
Page 6
RS-485 is a half-duplex, 2-wire, multi-drop communications implementation- Physical layer specification only- No communication protocol is implied- Differential twisted-pair increases noise
immunity- Data rates from 10’s of Kbps to 10’s of Mbps
Applications include- Industrial process monitoring and control- Factory automation- Robotics motor control- Serial communications requiring a more robust
electrical interface when compared to RS-232
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Triad RS-485 IP Block Highlights
Page 7
- One transmitter / one receiver- Separate TX/RX enables- Thermal cutoff and short circuit protection- Pre-compensation filter and programmable slew rate for enhanced performance
over long transmission lines
• Analog power (VDD) from 8V to 15V
• Analog I/O (VCC) from 3V to VDD
• Digital I/O from 1.5V to 5.5V
• Data rates up to 500Kbps
• Common mode range from -10V to +12V
• BUS+/- ports tolerant to +/- 45V
• 120mA drive capabilityon/off
VDD
GND
BUS+
BUS-
VCC
slew
E
TXIN
PRECOMP
TXEN
220k
220k
/RXEN
RXOUT
IOVOLTS
IO
IO
220k
220k
IO
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Key Parameter Comparison with RS-485 Standard
Page 8
Max Number of Transmitters/Receivers on Bus
Standard requires 32...
Triad IP supports 64!
Max Cable Length
Standard requires 4,000 ft... Triad IP supports 14,000 ft!
ORUp to 10 stubs of 2,500 ft each (25,000 ft total length)!
** Pre-compensation filter and programmable slew-rate allow communicating over long lengths
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