EMC Compliant, Group Isolated, 2-Channel Binary Input Module for Wide AC/DC Input Reference Design
TIDA-00809
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Key Document

Description

The TIDA-00809 TI design showcases a cost optimized architecture that improves resolution of a binary input module. A microcontroller unit (MCU) is shared between two input channels (group isolation) to minimize the cost per channel. Wide input range is covered using an amplifier with gain and a MCU integrated 10-bit analog-to-digital converter (ADC) to measure with in ±3% accuracy. This architecture eliminates the need for multiple hardware versions based on input voltage range as is the case with an opto-coupler based topology. A digital isolator is used to communicate the ADC code or the root-mean-square estimate of the input to the host processor. The design is tested for ESD, EFT and Surge as per IEC61000-4 Level 4.

Features
  • Measurement accuracy: <±3% over a wide input range for AC/ DC input using 10-bit SAR ADC
  • MCU shared between two channels (group isolation) to minimize cost per channel with additional unassigned input channels for larger channel count group isolation
  • Wide input range covered using an amplifier with two gain stages
  • Choice of basic or reinforced isolation between input and the host processor using digital isolator
  • Onboard current pulse generator (20mA-50mA, 50ms) using MCU PWM output to remove the contamination (anti-burnishing) on the binary input contacts

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TI Devices (9)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ISO1541  2.5-kVrms isolated unidirectional clock, bidirectional I2C isolator  Isolated interfaces  Sample & Buy View Design Kits & Evaluation Modules
ISO7320C  Robust EMC, Low Power, Dual-Channel 2/0 Digital Isolator, Fail-Safe High  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7820  High-immunity, 100-Mbps, 5.7-kVRMS reinforced dual-channel 2/0 digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM4041B  Adjustable precision micropower shunt voltage reference with 0.2% accuracy  Voltage references  Sample & Buy Not Available
LMV551  Single 3 MHz, micropower RRO amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
LMV614  Quad low voltage, low power, RRIO general purpose amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
MSP430G2332  MSP430G2x32, MSP430G2x02 Mixed Signal 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
TPS709  150-mA 30-V ultra-low-IQ wide-input low-dropout (LDO) regulator with reverse current protection  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ISO1541 Download Download
ISO7320C Download Download
ISO7820 Download Download
SOIC (DWW)| 16 Download
LM4041B Download Download
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LMV551 Download Download
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LMV614 Download
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MSP430G2332 Download Download
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SN6501 Download Download
TPS709 Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1349 07 Oct 2016
Design files (6)
Title Type Size (KB) Date
ZIP 603 07 Jul 2016
ZIP 3252 07 Jul 2016
ZIP 971 07 Jul 2016
ZIP 291 07 Jul 2016
ZIP 224 07 Jul 2016
ZIP 616 07 Jul 2016

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