GENERAL DESCRIPTION:

The ADBMS6815 is a multicell battery stack monitor that measures up to 12 series connected battery cells with a lifetime total measurement error (TME) of less than 1.5 mV. The cell measurement range of 0 V to 5 V makes the ADBMS6815 suitable for most battery chemistries. All 12 cells can be measured in 304 μs, and lower data acquisition rates can be selected for high noise reduction. Multiple ADBMS6815 devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery strings. Each ADBMS6815 has an isoSPI™ interface for high speed, 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 bidirectionally, ensuring communication integrity even in the event of a fault along the communication path. The ADBMS6815 can be powered directly from the battery stack or from an isolated supply. The ADBMS6815 includes passive balancing for each cell, with individual pulse-width modulation (PWM) duty cycle control for each cell. Other features include an on-board 5 V regulator, seven generalpurpose input/output (GPIO) lines, and a sleep state, where current consumption is reduced to 5.5 μA. 

FEATURES: 

Measures up to 12 battery cells in series 

Maximum lifetime total measurement error: 1.5 mV 

Stackable architecture for high voltage battery packs 

Built-in isoSPI interface 

2 Mb isolated serial communications 

Uses a single twisted pair, up to 20 meters 

Low EMI susceptibility and emissions 

Bidirectional for broken wire protection 

Capacitor or transformer coupled 

Hot plug tolerant without external protection 

ADBMS6815WFS models designed for use in ISO 26262 

applications for Automotive Safety Integrity Level 

Capability D (ASIL D) 

Diagnostics for IC and application circuit failure modes 

304 μs to measure all cells in a system 

16-bit ADC with programmable noise filter 

Passive cell balancing up to 300 mA per channel with 

programmable PWM 

7 GPIO or analog inputs 

Temperature or other sensor inputs 

Configurable as an I

2C or SPI master 

Sleep state supply current: 5.5 μA 

48-lead LQFP package with exposed pad 

AEC-Q100 qualified for automotive applications 

APPLICATIONS: 

Electric and hybrid electric vehicles 

Backup battery systems 

Grid energy storage 

Large portable power banks