AK8998 Datasheet, PDF (1/59 Pages) Asahi Kasei Microsystems – Preliminary

Preliminary
[AK8998/W/D]
AK8998/W/D
The AK8998 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 AK8998. The AK8998 is
available in a 16-pin QFN package, in wafer form and in a tray.
Features
• Pressure sensor compensation and excitation IC (Analog output)
• Supply voltage current: 7.1mA max @10kHz sampling
• Supply voltage: 3.0V±5%, 3.3V±5%, 5.0V±5%
• Operating temperature range: -20 to 85ºC
• Integrated sensor output compensation (AK8998 Input conversion)
• Offset voltage adjustment
- Adjustment range: Rough ±13 to ±373mV / Fine ±1 to ±34mV @5.0V
- Adjustment step: Rough 2 to 53mV /step / Fine 0.01 to 0.27mV /step @5.0V
• Offset voltage temperature drift adjustment (1st order coefficient)
- Adjustment range: ±0.04 to ±1.23mV/ºC @5.0V
- Adjustment step: 0.2 to 4.8µV/ºC @5.0V
• Output span voltage adjustment (G1, G2, G3)
- Total adjustment range: 5.7 to 261.6mV @5.0V
- G1 adjustment step :
0.95 to 74.7mV /step @5.0V
- G2 adjustment step :
5.7 to 130.8mV /step @5.0V
- G3 adjustment step :
0.01 to 0.40mV /step @5.0V
• Sensitivity temperature drift adjustment (1st order coefficient)
- Adjustment range: -4000ppm/ºC to +2500ppm/ºC or -2500ppm/ºC to +1000ppm/ºC
- Adjustment step: 18ppm/ºC step
• Integrated output reference voltage adjustment function
- Adjustment range: 0.02*VDD to 0.98*VDD
- Adjustment step: 10mV /step @5.0V
• Integrated sampling frequency switching function : 1kHz, 10kHz
• Integrated analog circuit reference voltage stabilizer
(Add an external capacitor to AGND pin as needed)
• SCF and SMF included for band limitation: fc:1.0kHz, 500Hz, 250Hz
• 2 wire serial interface (CSCLK, VOUT)
• Ratiometric voltage output
• Integrated constant voltage source for pressure sensor: 2.2V @ 3.0, 3.3V±5%
4.0V or 2.2V @ 5.0V±5%
• Integrated pressure detectors (x2)
- Detection threshold adjustment control
- Adjustment range: 0.125*VDD to 0.9*VDD
- Adjustment step: 0.025*VDD /step
- Detection threshold external setting function (DET2 / PTH pin use)
- hysteresis voltage adjustment control
- Adjustment range: 0.03*VDD to 0.06*VDD
- Adjustment step: 0.01*VDD /step
• Integrated reference voltage & reference current generator
- VREF voltage adjustment control
- Resolution: 3bits
- Adjustment step: 1% /step
MSxxxxx-E-00
-1-
2012/11