AK8996W View Datasheet(PDF) - Asahi Kasei Microdevices

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AK8996W

Pressure Sensor Interface IC

Asahi Kasei Microdevices 

[AK8996/W]

AK8996/W

Pressure Sensor Interface IC

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%

MS1055-E-02

1

2011/12

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