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TIDA-010985

Resistive-bridge insulation monitoring device for 800V DC systems with large Y cap reference design

Design files

TIDA-010985

Design files

Overview

This reference design features a resistive-bridge insulation monitoring device (IMD). The design accurately detects symmetrical and asymmetrical isolation resistance faults. The reference design also measures capacitance for high-voltage DC systems with large Y-capacitances (Y caps). The design meets response time requirements per UL standards.

Features
  • Large Y-cap support (up to 9μF total)
  • Low-computation predictive algorithm to shorten response time
  • Low voltage variation on Y caps (±10% with regard to protective earth)
  • Provides both symmetrical and asymmetrical fault detection
  • ±5% resistance and ±15% capacitance measurement errors (±3σ)
  • Supports UL 2231-2 ±15% accuracy and 10s response time
  • Supports up to 1kV bus voltage
  • Isolated Controller Area Network (CAN) 2.0 for communication
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Design files & products

Design files

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

download Design guide — TIDA-010985
PDF | HTML
TIDUFG5A.PDF (1939 KB)

Reference design overview and verified performance test data

download Assembly drawing — TIDA-010985
SLURB82.PDF (295 KB)

Detailed overview of design layout for component placement

download Bill of materials (BOM) — TIDA-010985
SLURB83.PDF (138 KB)

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

download CAD/CAE symbol — TIDA-010985
SLURB85.ZIP (3849 KB)

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

download Gerber file — TIDA-010985
SLVC927.ZIP (1181 KB)

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

download PCB layout — TIDA-010985
SLURB84.PDF (1521 KB)

PCB layer plot file used for generating PCB design layout

download Schematic — TIDA-010985
SLVRBZ5.PDF (526 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

General-purpose op amps

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Power modules (integrated inductor)

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Linear & low-dropout (LDO) regulators

TPS7A20 — 300mA ultra-low-noise low-IQ low-dropout (LDO) linear regulator with high PSRR

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Signal isolators with integrated power

ISOW1044 — Low emissions, 5-kVrms isolated CAN FD transceiver with integrated DC/DC power

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Matched thin-film resistors

RES60A-Q1 — Automotive 1400V matched thin-film resistor divider with 12.5MΩ fixed input

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TVS diodes

TSM24CA — 24-V, bidirectional, TVS surge-protection diode

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Solid-state relays

TPSI2240-Q1 — Automotive 1200V, 50mA isolated switch with reinforced isolation and avalanche protection

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Start development

Hardware development

Evaluation board

LP-MSPM0G3507 — MSPM0G3507 LaunchPad™ development kit for 80-MHz Arm® Cortex®-M0+ MCU

This reference design features a resistive-bridge insulation monitoring device (IMD). The design accurately detects symmetrical and asymmetrical isolation resistance faults. The reference design also measures capacitance for high-voltage DC systems with large Y-capacitances (Y caps). The design (...)

EVM user’s guide: PDF | HTML
Supported products & hardware

Supported products & hardware

Hardware development
Reference design
TIDA-010264 — MCU based medical alarm with supercapacitor backup reference design TIDA-010276 — 36V, 50A 3-phase GaN inverter reference design for BLDC motor control TIDA-010935 — Solar power line communication reference design TIDA-010985 — Resistive-bridge insulation monitoring device for 800V DC systems with large Y cap reference design
Evaluation board
PLC010935BP — PLC010935BP BoosterPack™ plug-in module for solar power line communication reference design
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LP-MSPM0G3507 — MSPM0G3507 LaunchPad™ development kit for 80-MHz Arm® Cortex®-M0+ MCU

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Hardware development
Reference design
TIDA-010264 — MCU based medical alarm with supercapacitor backup reference design TIDA-010276 — 36V, 50A 3-phase GaN inverter reference design for BLDC motor control TIDA-010935 — Solar power line communication reference design TIDA-010985 — Resistive-bridge insulation monitoring device for 800V DC systems with large Y cap reference design
Evaluation board
PLC010935BP — PLC010935BP BoosterPack™ plug-in module for solar power line communication reference design
TI’s Standard Terms and Conditions for Evaluation Items apply.

Software development

Firmware

MSPM0G3507-IMD-FW — Insulation Monitor Device Firmware for MSPM0G3507 and TIDA-010985

Supported products & hardware

Supported products & hardware

Hardware development
Reference design
TIDA-010985 — Resistive-bridge insulation monitoring device for 800V DC systems with large Y cap reference design
Download options

MSPM0G3507-IMD-FW — Insulation Monitor Device Firmware for MSPM0G3507 and TIDA-010985

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Latest version
Version: 1.0.0
Release date: Dec 29, 2025
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MSPM0G3507-IMD-FW.zip  — 1060 K

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Hardware development
Reference design
TIDA-010985 — Resistive-bridge insulation monitoring device for 800V DC systems with large Y cap reference design

Documentation

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Manifest

Manifest

Release Information

Insulation Monitor Device Firmware for MSPM0G3507 and TIDA-010985

What's new

  • Initial release
  • Insulation Monitor Device Firmware for MSPM0G3507 and TIDA-010985

Technical documentation

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Top documentation Type Title Format options Date
* Design guide Resistive-Bridge Insulation Monitoring Device for 800V DC Systems With Large Y Cap Reference Design (Rev. A) PDF | HTML Jan 15, 2026
Application note Design Considerations for Large Y-Capacitor Resistive-Bridge DC Insulation Monitoring Device PDF | HTML Jan 15, 2026

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