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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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.

Design guide — TIDA-010985

PDF | HTML

TIDUFG5.PDF (1943 KB)

Reference design overview and verified performance test data

Assembly drawing — TIDA-010985

SLURB82.PDF (295 KB)

Detailed overview of design layout for component placement

Bill of materials (BOM) — TIDA-010985

SLURB83.PDF (138 KB)

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

CAD/CAE symbol — TIDA-010985

SLURB85.ZIP (3849 KB)

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

Gerber file — TIDA-010985

SLVC927.ZIP (1181 KB)

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

PCB layout — TIDA-010985

SLURB84.PDF (1521 KB)

PCB layer plot file used for generating PCB design layout

Schematic — TIDA-010985

SLVRBZ5.PDF (526 KB)

Detailed schematic diagram for design layout and components

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Includes TI products in the design and potential alternatives.

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Matched thin-film resistors

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TVS diodes

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Solid-state relays

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Start development

Software

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

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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	Type	Title		Date
*	Design guide	Resistive-Bridge Insulation Monitoring Device for 800V DC Systems With Large Y Cap Reference Design	PDF \| HTML	Dec 17, 2025

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