Cell Monitoring Units for BESS
High-precision multi-cell monitoring for automotive, energy, and industrial applications
Overview
LTSCT Cell Monitoring Units (CMUs) are multi-channel cell monitoring and balancing ICs designed for various types of battery packs, including Li-Ion, LiFePO4, and NMC. CMU ICs support monitoring of up to 16 cells in series, with scalable designs that can extend to support 18- and 22-cell battery packs. These ICs are suitable for applications in the automotive sector, industrial energy storage systems, and consumer electronics.
The ICs offer key functions such as cell voltage measurement, temperature monitoring, cell balancing, and isolated communication with the main battery management controller unit. Each unit features 18-bit ΣΔ ADCs (Sigma-Delta Analog-to-Digital Converters) for precise sensing of cell voltage, pack voltage, current, temperature, and auxiliary signals, with ±1 mV ADC TME and ultra-low long-term drift. They provide high-accuracy cell voltage measurements within 15.625 μs for all channels, support busbar connections, and include low-power modes and cell balancing currents of up to 300 mA per channel.
Key features
- Battery passport, data logging
- Supports busbar connection and measurement
- Low Power Mode Support
- Isolated differential daisy chain communication @ 3 Mbps with optional ring architecture for stackable option
- Cell Balancing Support with maximum current of 300 mA per channel
- Integrated DC-DC converter high-side and low-side switches with wide input voltage range of 6 V to 100 V
- Support for Wireless BLE communication at 2.4 GHz with external RF PHY
- 9 multipurpose GPIOs for temperature sensor connections, digital IOs, PWM outputs, analog inputs
- Authentication Engine for secure communications with hardware crypto engine for algorithms such as SHA, RSA, ECDSA, etc.
- Monitoring support up to 16 cells in series (can also be extended up to 18/22) and multiple chemistries such as Li-Ion, LiFePO4, NMC, etc.
- Fully integrated 16S cell with monitoring, balancing, and protection
• +/-1 mV ADC TME with ultra-low long-term drift and built-in redundancy
• High accurate cell voltage measurements within 62.5 μs for all cell channels (best case) - Battery/Cell Protections
• Cell OV/UV, OT/UT
• Cell Open Wire Detection
Block diagram
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