CMU-117 ELECTRONIC BOARD
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CMU-117 Active — bidirectional active balancing for 17 cells
The CMU-117 Active from XAP Technology is a 17-cell monitoring and bidirectional active balancing unit developed for automotive and industrial battery integrators. It measures cell voltages, monitors temperatures and transfers energy between cells instead of dissipating it as heat. Its modular architecture, isolated communications and diagnostic functions support scalable battery packs, from compact 48 V systems to high-voltage architectures rated up to 800 V.
The CMU-117 Active uses bidirectional DC/DC converters capable of transferring up to 4 A per cell during charging or discharging. This local energy management is designed to bring cell charge levels closer together, maximise usable energy, reduce charging time and limit the thermal losses associated with dissipative balancing. The embedded microcontroller manages the acquisition and balancing loops in real time.
Each CMU monitors 17 independent channels and transmits its data to the BMU. Automatic identification and dynamic addressing simplify the organisation of multiple units within one battery pack and make in-field reconfiguration easier.
Applications
The CMU-117 Active integrates into battery management systems for automotive and industrial environments. Its modular approach covers compact 48 V batteries and high-voltage architectures up to 800 V, depending on the complete battery pack and BMU configuration.
Key features
- Independent monitoring of 17 cells over a range of 0 to 5 V per cell, with a claimed accuracy of ±2 mV.
- Bidirectional active balancing up to 4 A per cell through DC/DC converters.
- Temperature monitoring through 6 external NTC inputs and 2 internal sensors.
- Communication over one isolated TPL bus with 16-bit CRC checking and watchdog monitoring.
- Modular architecture, automatic identification and 512 kB memory for traceability.
Technical specifications and integration
The CMU-117 Active handles voltage and temperature acquisition, local active balancing and data transmission to the BMU. XAP supports modular system design through dynamic addressing, isolated communications and integrated diagnostics.
Integration
The integrator connects the 17 cell measurement channels, up to 6 external NTC sensors, the DC BUS input and the isolated TPL bus. One unit accepts a range of 0 to 5 V per cell and a claimed total voltage of 60 V; the complete architecture can scale up to 800 V with multiple units.
| Specification | Value |
|---|---|
| Voltage measurement | 17 independent, filtered and oversampled channels, from 0 to 5 V per cell; claimed accuracy of ±2 mV; 3 kV galvanic isolation |
| Voltage range | 0 to 5 V per cell; 60 V total |
| Temperature monitoring | 6 external NTC sensors and 2 internal sensors; digital calibration; –20 °C to +80 °C range; local overtemperature detection and warning for ΔT > 5 °C |
| Active balancing | Bidirectional DC/DC converters, up to 4 A per cell during charging or discharging; continuous energy transfer between cells |
| Balancing current | 4 A maximum per cell in active mode |
| Microcontroller | Real-time management of acquisition and balancing loops |
| Power supply | DC BUS input |
| Communication | One isolated TPL bus with common-mode filters; 16-bit CRC; watchdog and timeout monitoring |
| Isolation | 3,000 V galvanic isolation between the communications, logic and power domains |
| Protections | ESD diodes, transient suppressors, open-wire detection, thermal shutdown, and overvoltage and undervoltage monitoring |
| Diagnostics | Start-up self-test, CRC, watchdog and fault flags |
| Specification | Value |
|---|---|
| Operating temperature range | –40 °C to +85 °C |
| IP rating | IP40, bare board |
| Vibration and shock | Automotive-grade level claimed under IEC 60068-2-6 / -27 |
| Electromagnetic compatibility | Claimed compliance with UNECE R10 / ISO 11452 |
| Safety standards | ISO 26262 ASIL-B certification claimed at CMU level; compliance with UNECE R100 / R136 claimed |
| Reliability | Claimed continuous operating life exceeding 13,000 h |
| Specification | Value |
|---|---|
| Dimensions | 127 × 70 × 10 mm |
| Weight | Approximately 30 g |
| Reference | Description |
|---|---|
| PS0550 | CMU-117 Active |
Documentation
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CMU-117 Active — bidirectional active balancing for 17 cells
Key features
- Independent monitoring of 17 cells over a range of 0 to 5 V per cell, with a claimed accuracy of ±2 mV.
- Bidirectional active balancing up to 4 A per cell through DC/DC converters.
- Temperature monitoring through 6 external NTC inputs and 2 internal sensors.
- Communication over one isolated TPL bus with 16-bit CRC checking and watchdog monitoring.
- Modular architecture, automatic identification and 512 kB memory for traceability.