BMS 8550
3s-to-16s high-accuracy battery Analog Front-end for Battery pack
BMS 8550 is a high-precision battery monitoring chip for 3 to 16 series-connected batteries. It ensures robust protection with features like voltage, temperature, current monitoring, and communication diagnostics. Equipped with two ADCs, it samples multiple voltage channels and calculates cumulative charge. The chip supports various modes, adapting to configurations and conditions to reduce power consumption for MCU-less applications. Additionally, it facilitates efficient production with disorderly cell connection during power-up and provides integrated one-time programmable burning. Communication options include I2C and SPI, with two sets of voltage-programmable LDOs for external systems.
Package/Pins/Size
- 48
- TQFP 7mm x 7mm
Feature
- Supports 3 to 16 series-connected battery cells
- High-voltage pin with 85V withstand capability
- I2C (400kHz) and SPI (2MHz) interfaces with 8-bit CRC support
- 16-bit high-precision independent VADC and CADC
- Synchronized voltage and current sampling with a fastest sampling speed of 1.5ms
- 16 channels for battery cell voltage sampling; 6 channels for peripheral voltage sampling; 9 channels configurable for NTC temperature sampling; 1 channel for current sampling
- VADC accuracy < 5mV (typical)
- Wide-range current application, Rsense voltage measurement range ±200mV
- Charge pump for driving multiple high-side NFETs
- Built-in high-side PFET pre-charge and pre-discharge drive
- Chip-controlled or autonomously balanced battery cells, balancing current up to 100mA
- 19 configurable primary protection features
- Over/under-voltage protection for battery cells
- Overcurrent, short circuit protection for charge/discharge
- Charge/discharge/internal high/low-temperature/NFET over-temperature protection
- Communication loss detection mechanism/pre-charge delay protection mechanism
- 20 configurable secondary protection features
- Severe over/under-voltage protection for battery cells
- Severe overcurrent/short circuit protection/ severe over-temperature protection
- CFET/DFET fault detection
- Battery cell imbalance detection protection
- Charge pump fault protection/voltage regulator fault protection
- Internal failure self-diagnosis protection (OTP, oscillator, ADC, etc.)
- Disconnection detection mechanism
- Integrated secondary fuse drive function
- Low power consumption
- Low power mode < 25uA
- Shutdown mode 1uA
- Supports disorderly power-up
- 9 groups of GPIO can be configured as digital input/output, voltage sampling, NTC channel
- 2 channels of voltage-programmable LDO (1.8V~5V, 45mA)
- 48-pin TQFP 7mm x 7mm package
Applications
- Electric bicycles, electric light motorcycles, electric motorcycles
- Portable energy storage, home energy storage
- Battery packs for other applications
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