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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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WS030Connector Line.408Connector LineLine Hallow ArrowConnector Line.387Connector Line.385Connector Line.386Line Arrow.400Connector Arrow.327Connector Line.381Connector Line.380Connector Line.412Notes1 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.WS030WS030WS030Connector Line.232Sheet.248HARTHARTCurrent-Loop CircuitCurrent-Loop CircuitCurrent-Loop Circuit4-20mA Loop4-20mA Loop4-20mA LoopLine Bi-directionalLine Bi-directional.160Connector Arrow.163HART_INHART_INHART_IN3.1V/7.5mA3.1V/7.5mA3.1V/7.5mAConnected signals arrowConnected signals arrow.170AnalogPAKAnalogPAK2AnalogPAK2Line Bi-directional.177Line Bi-directional.178 HART_INHART_INHART_INFrom “Loop Power 24V”From “Loop Power 24V”From “Loop Power 24V”Connected signals arrow.185Connected signals arrow.186Resistor - FixedSSCSSCSSCConnected signals arrow.193Connector Arrow.195Connected signals lineBattery 2-Cell.203Sheet.280Sheet.281Sheet.282Sheet.283Line 1pt.1552Line 1pt.1608Connector 1.160Loop Power 24VLoop Power 24VLoop Power24VConnector 1.221Connector Line.225Connector Line.226Dotted LineDotted Line.228Connector Line.229Connector Line.230FieldFieldFieldHostHostHostConnector Line.245HART_OUTHART_OUT3HART_OUT3HART_OUTHART_OUT3HART_OUT3Line Arrow.271Ground - EarthSheet.309Sheet.310Sheet.311Sheet.312Connected signals arrow.290Line ArrowLine Arrow.296Line 3.3V3.3V3.3VAnalogPAK Op Amp x2 (Buffer/Filter)AnalogPAK Op Amp x2 (Buffer/Filter)AnalogPAKOp Amp x2(Buffer/Filter)Connector 1.302Resistor - Fixed.328DC/DCDC/DCDC/DCSheet.325Sheet.326Sheet.327Sheet.328Sheet.329AnalogPAK Op Amp x2 (Filter)AnalogPAK Op Amp x2 (Filter)AnalogPAKOp Amp x2(Filter)Connector Line.369Connector Line.370Connector Line.371Connector Line.372Connector 1.373Connector 1.374Loop-Loop-Loop-VSSVSSVSSVSSVSSVSSGNDGNDGNDConnector Arrow.382Connector Line.384Connector Arrow.388Connector Line.389Connector 1.390Connector 1.391Connector 1.392Connector 1.393Connector 1.394Connector 1.395Line.397Connector 1.399Connector ArrowOp AmpOp AmpOp AmpLine Arrow.406Board - Optional.630Option1Option1Option1Board - Optional.410Option2Option2Option2Line Arrow.417Line Arrow.418Connected signals arrow.419Line Bi-directional.4234MHz4MHz4MHzAnalogPAKAnalogPAK2AnalogPAK2Line Bi-directional.438USB PlugSheet.389Sheet.390Sheet.391Sheet.392Sheet.393SensorSensorSensorDC/DCDC/DCDC/DCBi-directionalConnector Arrow.403Connected signals arrow.404Line Hallow Arrow.407Sheet.410 MCUMCU1MCU1UARTUARTUARTGPIOGPIOGPIOI2C/SPII2C/SPII2C/SPIADCADCADCCLKOUTCLKOUTCLKOUTSheet.411MCUMCU1MCU1UARTUARTUARTGPIOGPIOGPIOUSB FSUSB FS4USB 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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