Power by Linear™/Analog Devices LTC6810 is a multicell battery stack monitor. These monitors measure up to six series-connected battery cells with a total measurement error of less than 1.8 mV. The cell measurement range of 0 V to 5 V makes the LTC6810 suitable for most battery chemistries. All six cells can be measured in 290 μs, and lower data acquisition rates can be selected for high noise reduction. Each LTC6810 has an isoSPI™ interface for high speed, RF-immune, long-distance communications.

Multiple LTC6810-1 devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery strings with one host processor connection for all devices. The LTC6810-1 supports bidirectional operation, allowing communication even with a broken wire. Using the LTC6810-2, multiple devices are connected in parallel to the host processor with each device individually addressed.

The LTC6810 can be powered directly from the battery stack or an isolated supply. The monitor includes passive balancing for each cell with PWM duty cycle control for each cell and the ability to perform redundant cell measurements. Other features include an onboard 5 V regulator, four general purpose I/O lines, and a sleep mode in which current consumption is reduced to 4 μA. The monitor comes in a 44-pin SSOP package that has a temperature range of -40°C to +85°C and +125°C. The LTC6810 is perfect for backup battery systems, electric, and hybrid vehicles.