AS8501-ASOT

Overview

The AS8501-ASOT is a high-precision, low-power data acquisition system designed for measuring small signals from shunt resistors and thermocouples. It operates on a single +5V supply and features a 16-bit resolution with differential inputs. The device includes an internal programmable gain amplifier (PGA) with gains of 1, 6, 24, 50, and 100, allowing measurement of input voltage ranges from ±7.5 mV to ±900 mV depending on the gain setting. It supports a maximum sampling frequency of 16 kHz and consumes only 15 mW of power. Key specifications include an offset voltage better than 0.5 µV, an input noise density of 35 nV/√Hz, and an operating temperature range of -40°C to +125°C.

Feature Summary

• Features self-calibration and system calibration capabilities with auto-calibration upon power-up to ensure high accuracy.
• Includes an internal factory-trimmed precision reference and programmable current sources for activating external sensors like RTDs or NTCs.
• Supports active wake-up mode via an internal oscillator comparator to minimize power consumption during standby.
• Integrates a digital comparator and a 3-wire serial interface compatible with SPI standards for flexible configuration.

Applications

• Battery management systems for automotive applications
• High-precision voltage and current measurement
• Power management units
• Millivolt and microvolt metering

Procurement Notes

Verify the specific ordering suffix 'ASOT' against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with the SOIC-16 package dimensions and electrical requirements before procurement. Cross-reference the part number with the latest datasheet revision to confirm availability and any potential obsolescence notices.

Selection Notes

Select this component when high accuracy and low noise are required for small signal measurements in automotive environments. Consider the PGA gain settings to match the expected input signal range, noting that higher gains offer better resolution for smaller voltages but have narrower input ranges. Evaluate the need for internal temperature sensing and programmable current sources to simplify external circuit design.

Part Context

The AS8501 is part of a family of specialized sensor interfaces developed by austriamicrosystems, now ams AG. It is designed as a complete front-end data acquisition system, integrating analog and digital functions to reduce external component count. The device is optimized for battery management systems, providing precise monitoring of current, voltage, and temperature parameters essential for reliable operation in automotive applications.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Verify pinout and register compatibility if considering alternative devices from other manufacturers. Check for differences in supply voltage requirements and package dimensions to ensure mechanical fit.