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