AK8999AW Datasheet, PDF (1/68 Pages) Asahi Kasei Microsystems – Pressure Sensor Control IC

CONFIDENTIAL
[AK8999A/AW/AD]
AK8999A/AW/AD
Pressure Sensor Control IC
1. Genaral Description
The AK8999A is a piezoresistive semiconductor pressure sensor control IC that compensates temperature
drifts and sensor variations. Variations in the sensor can be corrected with compensation values stored in
an integrated non-volatile memory (EEPROM).
The primary characteristics and its associated temperature drifts of pressure sensors are corrected with the
1st order coefficient for temperature compensation or the quasi 2nd order coefficient for temperature
compensation by piecewise linear approximation (1st order independent coefficients can be set for high and
low temperature side on the basis of 25C) by integrated temperature compensation circuits for offset
voltage and span voltage.
The AK8999A integrates two pressure threshold detectors. When a pressure exceeds the detection
threshold stored in the EEPROM is applied, the DET1 and the DET2/PTH pins output “H” or “L” (the
output polarity is selectable). This output can be used as a control signal of pressure switch applications.
Accessing to the AK8999A is made via the 2-wire serial interface on CSCLK pin and VOUT pin (set as
digital I/O mode) for setting functions and storing compensation values.
The AK8999A is available in a 16-pin UQFN package, in wafer form or in a die on a tray.
2. Feartures
• Pressure sensor compensation and excitation IC (Analog output)
• Supply voltage current
: 8.5mA max @ 8.33kHz sampling
• Supply voltage
: 3.0V ± 10%, 3.3V ± 10%, 5.0V ± 10%
• Operating temperature range
: -40 to 105 C
• Integrated sensor output compensation (AK8999A Input conversion)
- Offset voltage adjustment
Adjustment range
: Coarse ±13 to ±373mV, Fine ±1 to ±34mV @VDD:5.0V
Adjustment step
: Coarse 2 to 53mV /step, Fine 0.01 to 0.27mV /step @ VDD:5.0V
- Offset voltage temperature drift adjustment
(1st order or Quasi 2nd order correction by piecewise linear approximation)
Adjustment range
: ±0.04 to ±1.23mV/C @ VDD:5.0V
Adjustment step
: 0.2 to 4.8μV/C @ VDD:5.0V
- Output span voltage adjustment (G1, G2, G3)
Total adjustment range : 3.4 to 261.6mV @ VDD:5.0V
G1 adjustment step
: 0.57 to 74.7mV /step @ VDD:5.0V
G2 adjustment step
: 3.43 to 130.8mV /step @ VDD:5.0V
G3 adjustment step
: 0.01 to 0.40mV /step @ VDD:5.0V
- Sensitivity temperature drift adjustment
(1st order or Quasi 2nd order correction by piecewise linear approximation)
Adjustment range
: -4000ppm/ C to 2500ppm/ C
Adjustment step
: 18ppm/ C /step
• Integrated output reference voltage adjustment function
Adjustment range
: 0.02*VDD to 0.98*VDD
Adjustment step
: 0.002*VDD /step
• Integrated sampling frequency switching function
: 0.83kHz, 8.33kHz
• Integrated analog circuit reference voltage stabilizer
• SCF and SMF included for band limitation
: fc = 1.0kHz, 500Hz, 250 Hz
• 2-wire serial interface (CSCLK, VOUT pin)
• Ratiometric voltage output
MS1600-E-00
-1-
2014/05