AK8996

Overview

The AK8996 is a pressure sensor interface IC designed to excite and interface with bridge sensors, featuring compensation for temperature drift and sensor variation. It operates on supply voltages of 2.2V to 3.6V or 5V±10%, consuming 350µA at 100Hz sampling and 1µA in standby. The device includes integrated span voltage switching (factor of 5), offset adjustment (4-bit/7-bit resolution), and sensitivity temperature drift compensation. Sampling frequencies are selectable at 100Hz, 1kHz, 2kHz, and 10.24kHz. It provides ratiometric analog output via VOUT and VO pins, supports self-diagnosis, and stores calibration data in 157-bit EEPROM.

Feature Summary

• Integrated compensation for offset voltage, span voltage, and temperature drift using internal DACs and non-volatile memory.
• Built-in constant voltage source for bridge sensor excitation with selectable drive levels based on supply voltage.
• On-chip pressure detection and self-diagnostic circuits that trigger a high-level signal on the DET pin upon threshold exceedance or anomaly.
• Configurable sampling frequency and gain stages to optimize power consumption and signal bandwidth.

Applications

• Pressure sensor interface systems requiring high-precision analog compensation.
• Industrial monitoring applications utilizing bridge-type pressure transducers.
• Automotive pressure sensing modules operating across wide temperature ranges.

Procurement Notes

Verify the specific package variant required, as the AK8996 is available in both UQFN16 packaged form and wafer form. Confirm the supply voltage mode configuration (EVD setting) matches the target system voltage, as factory defaults reference 5V mode. Ensure external capacitance values on the VO and AGND pins align with the specified stabilization requirements for stable analog operation.

Selection Notes

Select the AK8996 when precise analog compensation for bridge sensors is needed without digital conversion. Evaluate the required sampling frequency against power constraints, as current draw increases significantly at higher rates like 10.24kHz. Consider the buffer gain settings and output impedance characteristics if driving low-impedance loads directly from the VO pin.

Part Context

This component belongs to Asahi Kasei Microdevices' specialized interface IC portfolio for sensor conditioning. It addresses the need for accurate signal conditioning in bridge sensor applications by integrating amplification, filtering, and calibration storage into a single compact solution.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing sensor bridge specifications before considering alternative interface solutions.