The AK8996 is a pressure sensor interface IC that features compensation for temperature drift and sensor

variation. It is designed to excite and interface to a bridge sensor. Variations in the sensor can be

corrected via compensation values stored in integrated non-volatile memory (EEPROM). Compensation

values are obtained from measurement results for a set of offset voltages and temperature drift, along with

a set of bridge voltages and temperature drift, including characteristics of the AK8996. The AK8996 is

available in either a 16-pin QFN package or in wafer form.

Features

? Pressure sensor compensation and excitation IC (Analog output)

? Low power consumption: 350μA typ. @ 100Hz sampling

? Standby function: 1μA max.

? Low-voltage operation: 2.2 to 3.6V, 5V±10

? Operating temperature range: -40 to 105oC

? Integrated span voltage switching function (by a factor of 5, typ.)

- Resolution: Gain Amp. 1: 3-bits; Gain Amp. 2:1-bit

Adjustment step: factor of 1/step (by a factor of 2 to 9);

factor of 1/step (by a factor of 1 and 2)

? Integrated sensor output compensation

? Offset voltage adjustment

- Resolution: Rough: 4-bits; Fine: 7-bits

- Adjustment step: Rough: 7.5/step; Fine 0.125/step @VDD: 5.0V

? Offset voltage temperature drift adjustment (1st/2nd order coefficient)

- Resolution: 10-bits; 8-bits

- Adjustment step: 0.196/step; 0.787/step

? Output span voltage adjustment

- Resolution: 9-bits

- Adjustment value: 100/[100+0.25*N]() N: -256 to +255

? Sensitivity temperature drift adjustment (1st/2nd order coefficient)

- Resolution: 10-bits; 8-bits

- Adjustment step: 0.196/step; 0.787/step

? Integrated output reference voltage switching function

- Resolution: Rough 5-bits; Fine 6-bits

- Adjustment step: 0.0005*VDD/step (0.0785*VDD to 0.9215*VDD) @VO

? Integrated criteria adjustment function for determining positive/negative pressure

- Resolution: 10-bits

- Adjustment step: 0.001*VDD/step (0.05*VDD to 0.95*VDD)

? Integrated output gain (buffer gain) switching function (by a factor of 4, typ.)

- Resolution: 3-bits

- Adjustment step: factor of 0.5/step (by a factor of 2 to 4)

? Integrated sampling frequency switching function: 100Hz, 1kHz, 2kHz, 10.24kHz

? Ratiometric voltage output

? Integrated constant voltage source for pressure sensor

: 2.0V @VDD: 2.2 to 3.6V; 4.0V @VDD: 5.0V±10