General Description
The AS8515 is designed for simultaneous measurement of shunt current sensor signal and battery voltage by two independent ADC channels. Both channels can measure small signals up to ±219 mV versus ground through programmable gain amplifier or larger signals in the 1V range without amplifier. After analog to digital conversion and digital filtering, the resulting digital values are accessible through 4-wire serial interface. The device is powered directly from the battery through LDO and provides a 3.3V supply for an external microcontroller. For communication with the next level ECU, the device offers a LIN 2.1 transceiver. Measurement of battery voltage is supported through resistive attenuator with disable for power saving in standby.

KEY FEATUREs
■ A precision voltage attenuator with power down facility
■ LIN 2.1 transceiver
■ Power-On Reset with programmable reset timeout and brownout detection through factory setting
■ A window Watchdog function in the normal mode and a timeout
   Watchdog in the device standby mode as a factory option
■ Load dump protection (42V) for all battery supplied pins and
   Enable pin
■ Internal reverse polarity protection (up to -27V) for all batterysensing pins, and LIN bus pin
■ Over temperature warning & shutdown functions
■ Two independent high resolution A/D converters with
   programmable over sampling ratio
■ Programmable sampling rate up to 4kHz throughput
■ Programmable gain, low noise amplifier for current channel with
   gain stages 5, 25, 40, 100
■ Internal temperature sensor
■ Synchronous acquisition for both ADC channels
■ Reference-voltage source (high precision and high stability)
■ Offset auto zero architecture on both channels
■ Current monitoring comparator with interrupt signal generation
   and µC clock enable. Timer with 2 related outputs for single
   shot sampling of current and voltage channel in low power
   mode.
■ Precision on chip RC oscillator or external clock. Low slew, low
   EMC clock output which can be used by external
   microcontroller which is enabled respectively disabled by mode
   control through SPI and interrupt from current monitor in low
   power mode.

APPLICATIONs
   The AS8515 is suitable for battery sensors, having shunt current
   sensor at minus pole. For lead acid, Li-Ion batteries up to 18V
   nominal, 42V over voltage capability.
   The device is also ideal as a general purpose sensor interface for
   automotive LIN slaves.