GENERAL DESCRIPTION

The AD7280A1 contains all the functions required for general-purpose monitoring of stacked lithium ion batteries as used in hybrid electric vehicles, battery backup applications, and power tools. The part has multiplexed cell voltage and auxiliary ADC measurement channels for up to six cells of battery management. An internal ±3 ppm/°C reference is provided that allows a cell voltage accuracy of ±1.6 mV. The ADC resolution is 12 bits and allows conversion of up to 48 cells within 7 μs.

FEATURES

12-bit ADC, 1 μs per channel conversion time

6 analog input channels, common-mode

range 0.5 V to 27.5 V

6 auxiliary ADC inputs

±1.6 mV cell voltage accuracy

On-chip voltage regulator

Cell balancing interface

Daisy-chain interface

Internal reference: ±3 ppm/oC

1.8 μA power-down current

High input impedance

Serial interface with alert function

1 SPI interface for up to 48 channels

CRC protection on read and write commands

On-chip registers for channel sequencing

VDD operating range: 8 V to 30 V

Temperature range: −40°C to +105°C

48-lead LQFP

Qualified for automotive applications

APPLICATIONS

Lithium ion battery monitoring

Electric and hybrid electric vehicles

Power supply backup

Power tools