Size and Cost Optimized Binary Module Reference Design Using Digital Isolator with Integrated Power


Design files


This reference design showcases space- and cost-optimized architecture for a 4-channel DC-input binary module with improved measurement accuracy and status indication using only two products simplifying system design. MCU-based binary module improves measurement resolution of binary input resulting in improved system performance for accurate and repeatable fault indications and eliminates the need for multiple hardware versions (use same design for multiple nominal voltage inputs). This reduces design, testing, manufacturing and field support efforts. In this design, 4-input channels are configured as group isolated inputs to minimize cost per channel. A 10-bit analog-to-digital converter (ADC) measures the DC inputs within ±3% ±1-V accuracy over wide range. Pre-compliance tests for EMI and EMC have been performed.

  • Binary input module design based on reinforced isolation  ISOW7841 or ISOW7841F, digital isolator with integrated high-efficiency, power converter with soft-start and 75-mA current output (quad with various configurations for GPIO, SPI or UART interface) simplifying system design
  • MSP430G2332 or MSP430FR2111, MCU-based 4-channel DC-input or 2-channel AC or DC voltage input measurement type binary input module
  • ISOW7841 provides 46% efficiency with output ripple of 100 mV for 70-mA load (pkpk)
  • Accuracy <=  ±3% of measured value ±1 V (programming resolution or step size) 
  • Meets pre-compliance tests for EMI and EMC as per IEC61000-4 and CISPR22 standards
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Design files & products

Design files

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


Reference design overview and verified performance test data

TIDRQA9.ZIP (1189 K)

Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRQB3.ZIP (3475 K)

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

TIDCD99.ZIP (4730 K)

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

TIDRQB2.ZIP (3690 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Charge pumps (inductorless)

TPS60241170 uVrms Zero-Ripple Switched Cap Boost Converter With Fixed 5.0V Output For VCO Supply

Data sheet: PDF | HTML
Digital isolators

ISO7741Robust EMC, quad-channel, 3/1, reinforced digital isolator

Data sheet: PDF | HTML
General-purpose op amps

LMV614Quad, 5.5-V, 1.5-MHz, RRIO operational amplifier

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet: PDF | HTML
Load switches

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

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR211116 MHz MCU with 4KB FRAM, 1KB SRAM, comparator, 10-bit ADC, UART/SPI, timer

Data sheet: PDF
MSP430 microcontrollers

MSP430G233216 MHz MCU with 4KB Flash, 256B SRAM, 10-bit ADC, SPI/I2C, timer

Data sheet: PDF
Signal isolators with integrated power

ISOW7821Dual-channel, 1/1, reinforced digital isolator with integrated power

Data sheet: PDF | HTML
Signal isolators with integrated power

ISOW7840Quad-channel, 4/0, reinforced digital isolator with integrated power

Data sheet: PDF | HTML
Signal isolators with integrated power

ISOW7841Quad-channel, 3/1, reinforced digital isolator with integrated power

Data sheet: PDF | HTML
Signal isolators with integrated power

ISOW7842Quad-channel, 2/2, reinforced digital isolator with integrated power

Data sheet: PDF | HTML
Supervisor & reset ICs

TPS3808Low-quiescent current supervisor with programmable delay & manual reset

Data sheet: PDF | HTML
Transformer drivers

SN6505BLow-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies

Data sheet: PDF | HTML

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Evaluation board

ISOW7841EVM — ISOW7841 quad-channel digital isolator with integrated DC/DC converter evaluation module

The ISOW7841EVM is an evaluation module (EVM) used to evaluate the ISOW7841. The ISOW7841 is a high-performance, reinforced quad-channel digital isolator with integrated DC/DC converter in a wide-body SOIC package (package code, DWE). The EVM features enough test points and jumper (...)

User guide: PDF
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* Design guide Size and Cost-Optimized Binary Module Ref Design Using Digital Isolator w Power (Rev. A) Jun. 06, 2017

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