HEV battery monitor features 0.04% acc.

The LTC6804 high voltage battery monitor targets hybrid electric and electric vehicles, and other high voltage, stacked-battery systems. It measures up to 12 series-connected battery cells at voltages up to 4.2 V with 16-bit resolution and better than 0.04% accuracy. The high-precision is maintained over time, temperature and operating conditions by a sub-surface Zener voltage reference similar to references used in precision instrumentation. It draws less than 4 µA from the batteries.

When stacked in series, the battery monitor enables the measurement of every battery cell voltage in large high voltage systems. Six operating modes are available to update rate, resolution and the low pass response of the built-in 3rd–order noise filter. In the fastest mode, all cells can be measured within 290 µs. Multiple ICs can be interconnected over long distances and operated simultaneously, a proprietary two-wire isoSPI interface. ($10.95 ea/1,000 — available now.)

By Paul O’Shea

Linear Technology , Milpitas , CA
Sales Office 408-428-2050
www.linear.com