Data Acquisition System
Description
AS8515
Data Acquisition System with Power Management and LIN Transceiver
for 12V Battery Sensor Applications
1 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.
The device is a stacked die system providing a high voltage CMOS IC for power management and transceiver functions as a Top die and low voltage sensor interface functions as a Bottom die inside a 32-pin MLF (5x5 mm) package.
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.
The integrated circuit can execute measurements with internal and external sensors and sources for the voltage channel and with external sensor for the current channel.
2 Key Features
A precision voltage attenuator with power down facility
LIN 2.
1 transceiv...
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