TIDA-00420

ADC-based, digitally-isolated, wide-input, 16-channel, AC/DC binary input reference design

TIDA-00420

Design files

Overview

This reference design showcases a cost-optimized and scalable ADC-based AC/DC binary input module (BIM) architecture with reinforced isolation. The 16 channels of a 10- or 12-bit SAR ADC are used for sensing multiple binary inputs. The op amps, in addition to keeping the cost per-channel low, provide optimal signal conditioning for each input. A digital isolator (basic or reinforced) is used to isolate the host MCU or processor. A provision is available to measure temperature, humidity, and magnetic field for diagnostics. A reinforced isolation DC/DC power supply with configurable output provides the required supply for the binary module.

Features
  • Scalable input AC/DC binary input module with ADC front end
  • Isolated DC/DC based power supply to isolate the host from the sensor side
  • Improved system reliability from use of digital isolators over optocoupler-based solution
  • Wide input range from 10 V to 300 V and supports measurement in AC or DC input voltages
  • Measurement of input voltage provides provision for programmable threshold
  • Device selection optimized per channel

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU858C.PDF (915 K)

Reference design overview and verified performance test data

TIDRDX3B.ZIP (1514 K)

Detailed schematic diagram for design layout and components

TIDRDX4B.ZIP (358 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRDX5B.ZIP (1364 K)

Detailed overview of design layout for component placement

TIDRDX8B.ZIP (29259 K)

Files used for 3D models or 2D drawings of IC components

TIDCA24B.ZIP (2120 K)

Design file that contains information on physical board layer of design PCB

TIDRDX6B.ZIP (3761 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Digital isolators

ISO6741-Q1Automotive, general-purpose, quad-channel, 3/1 digital isolator

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Digital isolators

ISO7740Robust EMC, quad-channel, 4/0, reinforced digital isolator

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Digital isolators

ISO7842Highest isolation rating, quad-channel, 2/2, reinforced digital isolator

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Buck modules (integrated inductor)

LMZ105015.5V, 1A Step-Down DC/DC Power Module in 3mm × 2.6mm Package

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Buck modules (integrated inductor)

LMZM2360136-V, 1-A Step-Down DC-DC Power Module in 3.8-mm × 3-mm Package

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Charge pumps (inductorless)

REG7105560-mA, 5.5V, Buck/boost Charge Pump in ThinSOT-23

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Comparators

LM290130-V quad differential comparator

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Digital potentiometers (digipots)

TPL0401A-10128-tap single-channel digital potentiometer (digipot) with I2C interface (address 0101110)

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ESD & surge protection ICs

TVS07017-V bidirectional flat-clamp surge protection device

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ESD & surge protection ICs

TVS140014V flat-clamp surge protection device

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General-purpose op amps

TLV6001Single, 5.5-V, 1-MHz, RRIO operational amplifier

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General-purpose op amps

TLV6002Dual, 5.5-V, 1-MHz, RRIO operational amplifier

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Humidity sensors

HDC10802% RH low-power digital relative humidity sensor

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I2C general-purpose I/Os (GPIOs)

TCA953516-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt & config registers

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I2C level shifters, buffers & hubs

P82B962-bit bidirectional 2- to 15-V 400-kHz I2C/SMBus buffer/cable extender

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I2C level shifters, buffers & hubs

TCA95172-bit level-translating 400-kHz I2C/SMBus buffer/repeater with powered-off high-impedance

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Ideal diode/ORing controllers

LM74700-Q13.2-V to 65-V, 80-uA IQ automotive ideal diode controller

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Inverting buffers & drivers

SN74LVC1G14Single 1.65-V to 5.5-V inverter with Schmitt-Trigger inputs

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Isolated DC/DC converters & modules

UCC12040500 mW, high efficiency 3 kVrms isolated DC-DC converter

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Isolated DC/DC converters & modules

UCC12050500-mW, high-efficiency, 5-kVRMS isolated DC/DC converter

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Linear & low-dropout (LDO) regulators

TLV704150-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator

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Linear & low-dropout (LDO) regulators

TLV742P200-mA low-IQ low-dropout (LDO) voltage regulator

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Linear & low-dropout (LDO) regulators

TPS738011-A, 20-V, adjustable low-dropout voltage regulator with reverse current and voltage protection

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Linear Hall-effect sensors

DRV5053-Q1Automotive, high voltage (up to 38V), linear hall effect sensor

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Load switches

TPS229195.5-V, 1.5-A, 90-mΩ load switch with adj. output discharge

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Load switches

TPS229445.5-V, 0.1-A, 500-mΩ, load switch with current limit and active high enable

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N-channel MOSFETs

CSD17571Q230-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm

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N-channel MOSFETs

CSD18534Q5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.8 mOhm

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Noninverting buffers & drivers

SN74LVC1G17Single 1.65-V to 5.5-V buffer with Schmitt-Trigger inputs

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Noninverting buffers & drivers

SN74LVC2G342-ch, 1.65-V to 5.5-V buffers

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Precision ADCs (<=10MSPS)

ADS7028Small 8-channel 12-bit analog-to-digital converter (ADC) with SPI, GPIOs and CRC

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Precision ADCs (<=10MSPS)

ADS7128Small 8-ch 12-bit analog-to-digital converter (ADC) with I2C interface, GPIOs, CRC and RMS module

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Precision ADCs (<=10MSPS)

ADS795212 bit, 1 MSPS, 12 Ch, single ended, micro power, sr i/f, SAR ADC

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Precision ADCs (<=10MSPS)

ADS795312-Bit, 1-MSPS, 16-Channel, Single-Ended, microPower SAR ADC with Serial I/F

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Precision ADCs (<=10MSPS)

ADS795610 bit, 1 MSPS, 12 Ch, Single Ended, Micro Power, sr i/f, SAR ADC

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Precision ADCs (<=10MSPS)

ADS795710 bit, 1 MSPS, 16 Ch, Single Ended, Micro Power, sr i/f, SAR ADC

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Precision DACs (<=10MSPS)

DAC101C08110-Bit Micro Power Digital-to-Analog Converter with an I2C-Compatible Interface

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Precision DACs (<=10MSPS)

DAC55788-bit, Octal Channel, Ultra-Low Glitch, Voltage Output, 2-Wire Interface DAC

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Series voltage references

REF31404-V, 20-ppm/°C max, 100-µA, 3-pin SOT-23 series voltage reference

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Series voltage references

REF34252.5-V, low-drift, low-power, small-footprint series voltage reference

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Series voltage references

REF50252.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

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Shunt voltage references

LM4040-N100-ppm/°C precision micropower shunt voltage reference

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Shunt voltage references

TL431Adjustable precision shunt regulator

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Signal isolators with integrated power

ISOW7844Quad-channel, 0/4, reinforced digital isolator with integrated power

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Supervisor & reset ICs

TPS3897Single-channel, ultra-small, adjustable supervisor with active-high, open-drain output

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eFuses & hot swap controllers

TPS25921A4.5-V to 18-V, 90mΩ, 0.4-1.6A eFuse with auto retry fault response

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Technical documentation

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Type Title Date
* Design guide ADC-Based, Digitally-Isolated, Wide-Input, 16-Ch, AC/DC Binary Input Ref. Design (Rev. C) Mar. 01, 2021
White paper High-Voltage Semiconductor Solutions for Meeting Isolation Requirements Jan. 20, 2021

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