ams OSRAM AS8512 Analog Front End (AFE)

ams OSRAM AS8512 Analog Front End (AFE) is a virtually offset-free, low-noise, two-channel measurement device. The AS8512 was developed to accurately measure battery current from the mA range up to the kA range, converging with a 100µΩ shunt resistor in series with the battery rail.

The ams OSRAM AS8512 AFE utilizes the second measurement channel to capture either battery voltage synchronous with the current measurement or measure the analog output of an internal or external temperature sensor. Both channels are matched and can either calculate small signals up to ±160mV versus ground through a programmable gain amplifier or sizeable signals in the 0V to 1V range without the amplifier. After analog to digital conversion and filtering, the resulting 16-bit data is accessible via a 4-wire standard serial interface (SPI).

Features

Low supply voltage
3.3V supply voltage
Redundant measurement possibility
Two high-resolution 16-bit Σ-Δ A/D converters
Flexible configuration
Programmable sampling to enable data throughputs from less than 1Hz to 8kHz
Unique measurement principle
Zero offsets for both channels
Precision, low noise, programmable gain amplifiers for both channels with gains 5, 25, 40, and 100 to support wide dynamic ranges
Option for multiplexing either one differential input, two single-ended inputs, or the internal temperature sensor on one channel

Programmable current source for external temperature sensor connectable to any of the inputs
High precision and high stability 1.2V reference voltage source
Digital signal processing with filter options for both channels
Four operating modes providing
- Continuous data acquisition (or)
- Periodic single-shot acquisition (or)
- Continuous acquisition on threshold crossing of programmed current levels (or)
- A combination of the above
On-chip high-precision 4MHz RC oscillator or option for external clock
-40ºC to 105ºC ambient operation
Chip ID feature
SSOP-20 pin package

ams OSRAM AS8512 Analog Front End (AFE)

Features

Block Diagram

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