AD7284

Data Sheet FEATURES 8 analog input channels, integrated secondary monitor ±3 mV maximum cell voltage accuracy, TUE, 14-bit ADC Very low measurement latency across 96 cells Stack voltage measurement ±16 mV typical battery stack voltage (TUE) accuracy Cell balancing interface, with individually programmable on time 4 auxiliary analog input channels, 14-bit ADC Suitable for thermistor inputs and external diagnostics Buffered reference output for ratiometric measurements Internal temperature sensor VDD operating range: 10 V to 40 V On-chip 5 V regulator Watchdog timer IDD matching current: 100 μA Robust, proprietary daisy-chain interface SPI to host controller CRC protection on read and write commands 2 general-purpose outputs 64-lead low profile quad flat package, exposed pad (LQFP_EP) Junction temperature range: −30°C to +120°C Qualified for automotive applications APPLICATIONS Li-Ion battery monitoring Electric and hybrid electric vehicles Stationary power applications GENERAL DESCRIPTION The AD7284 contains all the functions required for the generalpurpose monitoring of stacked Li-Ion batteries, as used in hybrid electric vehicles and battery backup applications. The AD7284 has multiplexed cell voltage and auxiliary, analogto-digital converter (ADC) measurement channels supporting four to eight cells of battery management. The device provides a maximum total unadjusted error, TUE, (cell voltage accuracy) of ±3 mV that includes all the internal errors from input to output. Th...