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Current Loop Communication with AnalogPAK

Overview

This system utilizes AnalogPAK™ to configure a 4 to 20mA current loop for communication between master and slave devices. AnalogPAK™ supports modulation and demodulation of communication data as a Highway Addressable Remote Transducer (HART®) modem, as well as FSK modulation at 1200Hz and 2200Hz.

System Benefits:

  • AnalogPAK™ provides a smaller size and reduced cost.
  • The SLG47011 integrates a HART modem into a single chip, allowing flexible MCU selection based on user specifications.
  • The zero-drift, ultra-low offset op amp in the SLG47003 ensures stable and high-precision signal transmission.

Block Diagram

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WS030 Connector Line.408 Connector Line Line Hallow Arrow Connector Line.387 Connector Line.385 Connector Line.386 Line Arrow.400 Connector Arrow.327 Connector Line.381 Connector Line.380 Connector Line.412 Notes 1 Choose any MCU according to user specifications. 2 HART mod... 1 Choose any MCU according to user specifications.2 HART modem: PGA, ACMP, Digital filter, DAC, Modulator/Demodulator, etc.3 FSK modulation (1200Hz, 2200Hz).4 Option when using USB. WS030 WS030 WS030 Connector Line.232 Sheet.248 HART HART Current-Loop Circuit Current-Loop Circuit Current-Loop Circuit 4-20mA Loop 4-20mA Loop 4-20mA Loop Line Bi-directional Line Bi-directional.160 Connector Arrow.163 HART_IN HART_IN HART_IN 3.1V/7.5mA 3.1V/7.5mA 3.1V/7.5mA Connected signals arrow Connected signals arrow.170 AnalogPAK AnalogPAK2 AnalogPAK2 Line Bi-directional.177 Line Bi-directional.178 HART_IN HART_IN HART_IN From “Loop Power 24V” From “Loop Power 24V” From “Loop Power 24V” Connected signals arrow.185 Connected signals arrow.186 Resistor - Fixed SSC SSC SSC Connected signals arrow.193 Connector Arrow.195 Connected signals line Battery 2-Cell.203 Sheet.280 Sheet.281 Sheet.282 Sheet.283 Line 1pt.1552 Line 1pt.1608 Connector 1.160 Loop Power 24V Loop Power 24V Loop Power24V Connector 1.221 Connector Line.225 Connector Line.226 Dotted Line Dotted Line.228 Connector Line.229 Connector Line.230 Field Field Field Host Host Host Connector Line.245 HART_OUT HART_OUT3 HART_OUT3 HART_OUT HART_OUT3 HART_OUT3 Line Arrow.271 Ground - Earth Sheet.309 Sheet.310 Sheet.311 Sheet.312 Connected signals arrow.290 Line Arrow Line Arrow.296 Line 3.3V 3.3V 3.3V AnalogPAK Op Amp x2 (Buffer/Filter) AnalogPAK Op Amp x2 (Buffer/Filter) AnalogPAKOp Amp x2(Buffer/Filter) Connector 1.302 Resistor - Fixed.328 DC/DC DC/DC DC/DC Sheet.325 Sheet.326 Sheet.327 Sheet.328 Sheet.329 AnalogPAK Op Amp x2 (Filter) AnalogPAK Op Amp x2 (Filter) AnalogPAKOp Amp x2(Filter) Connector Line.369 Connector Line.370 Connector Line.371 Connector Line.372 Connector 1.373 Connector 1.374 Loop- Loop- Loop- VSS VSS VSS VSS VSS VSS GND GND GND Connector Arrow.382 Connector Line.384 Connector Arrow.388 Connector Line.389 Connector 1.390 Connector 1.391 Connector 1.392 Connector 1.393 Connector 1.394 Connector 1.395 Line.397 Connector 1.399 Connector Arrow Op Amp Op Amp Op Amp Line Arrow.406 Board - Optional.630 Option1 Option1 Option1 Board - Optional.410 Option2 Option2 Option2 Line Arrow.417 Line Arrow.418 Connected signals arrow.419 Line Bi-directional.423 4MHz 4MHz 4MHz AnalogPAK AnalogPAK2 AnalogPAK2 Line Bi-directional.438 USB Plug Sheet.389 Sheet.390 Sheet.391 Sheet.392 Sheet.393 Sensor Sensor Sensor DC/DC DC/DC DC/DC Bi-directional Connector Arrow.403 Connected signals arrow.404 Line Hallow Arrow.407 Sheet.410 MCU MCU1 MCU1 UART UART UART GPIO GPIO GPIO I2C/SPI I2C/SPI I2C/SPI ADC ADC ADC CLKOUT CLKOUT CLKOUT Sheet.411 MCU MCU1 MCU1 UART UART UART GPIO GPIO GPIO USB FS USB FS4 USB FS4

MCU

RA Arm Cortex-M MCUs

MCU

RA Arm Cortex-M MCUs
RA Arm Cortex-M MCUs

AnalogPAK

AnalogPAK

AnalogPAK

AnalogPAK

AnalogPAK

AnalogPAK

AnalogPAK

AnalogPAK

Op Amp

General-purpose Op Amps

SSC

Sensor Signal Conditioners (SSC/AFE)

DC/DC

Buck Regulators (Integrated FETs)

DC/DC

Buck Regulators (Integrated FETs)

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