EMBMS1820 is a multicell battery monitor that measures up to 18 series connected battery cells with a total measurement error (TME) of less than 3.0 mV. The wide cell measurement range is from 0V to 5.5V that makes the device suitable for most battery chemistries, such NCM, LFP, Sodium-ion and Lead-acid batteries etc. All 18 cells can be measured in 329 μs, and lower data acquisition rates can be selected for higher noise reduction.

Multiple EMBMS1820 devices can be connected in series, permitting simultaneous cell monitoring of stacked high voltage battery strings. Each EMBMS1820 has an isolated daisy chain communication interface for high speed (EMiso), RF immune, long distance communications. Multiple devices are connected in a daisy chain with one host processor connection for all devices. This daisy chain can be operated bi-directionally, ensuring communication integrity, even in the event of a fault along the communication path.

The device can be powered directly from the battery stack or from an isolated power supply. It integrates passive balancing up to 350mA for each cell, with individual pulse-width modulation (PWM) duty cycle control for each cell. The other features include an integrated 5 V regulator, 9 general-purpose I/O, and a sleep mode, where current consumption is reduced to 8 μA.