AS8510 Data Acquisition Front-End IC

Description

The AS8510 is a virtually offset free, low noise, 2 channel measurement device. It is tailored to accurately measure battery current from mA range up to kA range in combination with a 100 uOhm shunt resistor connected in series with the battery rail. Through the second measurement channel it enables capture of either battery voltage synchronous with the current or to measure the analog output of an internal or external temperature sensor. It offers for each channel a programmable gain amplifier with 4 gain stages followed by a 16 bit Sigma Delta AD converter.

The device includes a number of additional application specific features as digital filter to shape the signal paths frequency response, operating mode selection including low power current monitoring with wake function through threshold comparator, internal precision reference, RC clock generator for normal- and low power modes, interrupt output for device synchronization, timers for single shot sampling.

You can do evaluation of the AS8510 with the AS8510 Demoboard.

Key Features

• 3.3V supply voltage
• Two independent, fully differential, high resolution 16 bit A/D converters with programmable over sampling ratio to enable sampling rates from typically 1kHz to below 1 Hz
• Precision, low noise, programmable gain amplifiers for both channels for gains 5, 25, 40, 100
• Offset auto zero architecture on both channels
• 2 additional multiplexed single ended inputs including programmable 250 uA current source for external temperature sensor
• Internal temperature sensor
• High precision and high stability 1.2V reference voltage source
• Digital filter options for both channels
• Various operating modes for normal and standby operation
• Standby current monitoring for active wake with 40 uA average current consumption, programmable threshold
• Micro controller interface through 4 wire SPI
• On chip 4MHz RC oscillator or external clock
• -40°C to +125°C ambient operation
• AEC Q 100 automotive qualified
• Internal chip ID for full traceability
• SSOP20 package

Applications

• Battery sensor with current sensor in the battery minus rail
• Battery sensor with current sensor in the battery plus rail together with AS8525 zero offset PGA and level translator
• General purpose sensor interface for high accuracy resistive sensors. The 2 channel architecture enables digital error correction techniques like delta by sigma division or capture of bridge current/voltages with subsequent error correction in external uC

Block diagram for AS8510 Data Acquisition Front-End IC