1. BMS1202 Introduction

Introducing the LiBat™ BMS1202, an ultra-compact battery management system slave module designed for seamless integration into 5S-12S battery configurations. This fully digital, ready-to-use module operates exclusively as part of a larger system, communicating with the master module through a dedicated isolated differential communication line. Controlled by the master module, the BMS1202 ensures precise coordination within the battery management system. Remarkably versatile, these slave modules can be stacked up to 16 units via a robust communication line, allowing for extensive scalability. Furthermore, the daisy-chainable design facilitates the placement of modules using cables exceeding 30 meters in length, offering flexibility in system configuration and placement.

Key Features:

Ultra Small Design 65mm x 43.5mm
Compact, plug-and-play BMS slave module
5S-12S cell measurement with 0.1mV resolution
Adjustable passive balancing current
Auto deep sleep
Isolated daisy-chain communication line
Self powered
3 external, 1 internal NTC

Table.1.1: BMS1202 Technical Specifications

PARAMETER	SPECIFICATIONS
Power Source	Self powered. No external power need.
Power Consumption	Power Down: ~0.050 mW , RUN State: ~300mW
Wake Up Trigger	Master Communication Start
LED	Run Status
Digital Interface	1 x Isolated Daisy-Chain
Number of cells	Up to 12 Cells. Minimum 11 V
Cell Type	Any battery cell in voltage range
Minimum cell voltage	250 mv
Maximum cell voltage	4500 mV
Accuracy of Cell Voltage Measurement	±1.6mV typical, < ±8.3mV max
Balance Method	Passive Balancing
Balance Current	420mA @ 4.2Vdc cell voltage
Balance Power	2W max. per cell
Temperature Sensor Type	NTC, 10KΩ @ 25 °C
Temperature Sensor Accuracy	±1.5 °C (depends on sensor sensitivity)
Number of Temperature Sensor	Up to 3 external sensor probes, 1 x On board NTC
Operating Temperature	-20 °C to +70 °C (-4° F to +158° F)
Relative Humidity	5% to 95% (non-condensing)
Dimensions and Weight	65 mm X 43.5 mm X 8.6 mm, 50g