AK8996 Datasheet, PDF (1/74 Pages) Asahi Kasei Microsystems – Pressure Sensor Interface IC

[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