AK8999AD Datasheet, PDF (64/68 Pages) Asahi Kasei Microsystems – Pressure Sensor Control IC

CONFIDENTIAL
[AK8999A/AW/AD]
6.2) Description of Control Register (Volatile Memory)
a) Adjustment mode (Register name: CM1)
This register is used to adjust the AK8999A reference voltage and pressure sensor's offset, span,
offset temperature drift and sensitivity temperature drift including those of the AK8999A.
In addition, the value of the register returns to the initial value on the following conditions.
■ At the power up
■ When CSCLK = Low is maintained 0.5msec or more
■ When ETST[0] is set to "L"
Address : 00 hex D[3:0] = AM[3:0]
(This is not a nonvolatile EEPROM, but a volatile register.)
D[7:0] Symbol
Mode setup
Description
D[7:4]
Reserved
Setup prohibited
D[3:0] AM[3:0] IC adjustment mode
0000
(default)
0001 AVR
VREF adjustment The VREF voltage is output at the VOUT pin.
0010 AIR
IREF adjustment The IREF current is output at the VOUT pin.
0011 AFR
OSC adjustment
Input the fixed period of High level (2.0msec) from the
CSCLK pin. The count value in the internal counter is
stored in the register.
The VTMP voltage is output at the VOUT pin.
0100 ATO
VTMP adjustment Adjust this voltage so that it matches the VREF
voltage at 25C.
0101 ADT1
judge threshold 1
adjustment
The internally set judge threshold value 1 is output at
the VOUT pin.
0110 ADT2
judge threshold 2
adjustment
The internally set judge threshold value 2 is output at
the VOUT pin.
0111 AHY1
The hysteresis voltage of the comparator 1 is output at
hysteresis voltage 1
the VOUT pin.
1000 AHY2
The hysteresis voltage of the comparator 2 is output at
hysteresis voltage 2
the VOUT pin.
1001 ALV
Output reference The output reference voltage is output at the VOUT
voltage adjustment pin.
1001-
1111
Reserved
Setup prohibited
MS1600-E-00
- 64 -
2014/05