4-20mA Analog Input Module Reference Design for Safety Applications

(ACTIVE) TIDA-00548

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Key Document

Description

The TIDA-00548 design is an isolated dual-channel 4- to 20-mA analog input reference design, which can be used as a sub-part for functional safety programmable logic controllers (PLC). This reference design delivers digitized input values using a 32-bit high-performance analog-to-digital converter (ADC). The RM4x dual-core ARM® Cortex®-R4 based CPU with lockstep technology and built-in self-tests (BIST) compares the converted values of up to nine selectable analog input signal chain paths. The dual input approach with two separate burden resistors allows redundant measurement of either a single 4- to 20-mA loop or two independent loops. Hercules™ RM ARM Cortex-R based MCUs for functional safety applications (part of the SafeTI designs packages) help to develop systems according to  IEC 61508 SIL 3.

Features
  • Two channel 4- to 20-mA current measurement for redundancy with full-scale error less than ±0.01%
  • Two ADC references (external, internal)
  • Utilizes ADC built-in features such as test DAC, secondary ADC, analog signal level alarm, SPI CRC and timeout, and more
  • Hercules RM ARM Cortex-R based MCU (for development of IEV 61508 functional safety applications)
  • Isolator shutdown upon failure provides reliable notification to backend
  • All integrated circuits: MTBF greater 4·10^8

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Design Files

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Bill of Materials (BOM)

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TI Devices (13)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1263  32-Bit 38kSPS 10-Ch Delta-Sigma ADC With PGA, Voltage Reference, and Aux ADC for Factory Automation  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
CSD18534Q5A  60V N-Channel NexFET Power™ MOSFET  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
INA826  Precision, 200-μA Supply Current, 36-V Supply Instrumentation Amplifier  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
ISO7141CC  4242-VPK Small-Footprint and Low-Power 3/1 Quad Channel Digital Isolator with Noise Filter  Isolation  Sample & Buy View Design Kits & Evaluation Modules
REF5030  Low Noise, Very Low Drift, Precision Series Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
RM41L232  16- and 32-BIT RISC Flash Microcontroller  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules
SN6501  Low-Noise 350 mA, 410 kHz Transformer Driver for Isolated Power Supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC1G332  Single 3-Input Positive-OR Gate  Gate  Sample & Buy Not Available
SN74LVC2G86  Dual 2-Input Exclusive-Or Gate  Gate  Sample & Buy Not Available
TLV333  350 kHz, Low-Noise, RRIO, CMOS Operational Amplifier for Cost-Sensitive Systems  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS27082L  PFET Load Switch with Adjustable Slew Rate, Fast Transient Isolation & Hysteretic Control  Power switches  Not Available Not Available
TPS62170  3–17V 0.5A Step-Down Converter with DCS-Control in 2x2 QFN package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS65381-Q1  Automotive 4.5V to 40V, 1.3A Buck Converter with 4 LDOs for Microcontrollers  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1263 Download Download
CSD18534Q5A VSONP (DQJ)| 8 Download
INA826 Download Download
Download Download
Download -
ISO7141CC Download Download
REF5030 Download Download
Download Download
RM41L232 Download Download
SN6501 Download Download
SN74LVC1G332 Download Download
Download Download
Download Download
Download
Download
Download -
SN74LVC2G86 Download
Download Download
Download -
TLV333 Download Download
Download Download
Download
TPS27082L Download Download
TPS62170 Download Download
TPS65381-Q1 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1011 24 Oct 2016 97
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 604 04 Nov 2016 26
ZIP 2468 04 Nov 2016 21
PDF 3870 04 Nov 2016 16
PDF 420 04 Nov 2016 13
PDF 216 04 Nov 2016 24
PDF 1641 04 Nov 2016 129

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