AK8996 Datasheet, PDF (69/74 Pages) Asahi Kasei Microsystems – Pressure Sensor Interface IC

[AK8996/W]
5.2) Description of Control Register (Volatile Memory)
a) Adjustment mode 1 (Register name: CM1)
This register is used to adjust the AK8996 reference voltage and pressure sensor's offset, span,
offset temperature drift and sensitivity temperature drift including those of the AK8996.
Address: 00 hex D[6:0]=AC[1:0], AM[3:0], AEPEN[0]
(This is not a nonvolatile EEPROM, but a volatile register.)
D[7:0] Symbol
Mode setup
Description
D[7]
Reserved
D[6:5]
AC[1:0]
Pressure judge circuit
control
Controls pressure judge circuit
00 NRM2
Normal operation (Default)
01 APP
Positive pressure
output
Pressure determination result is positive pressure.
10 APN
Negative pressure
output
Pressure determination result is negative pressure.
11
Reserved
D[4:1] AM[3:0] IC adjustment mode Adjustment signal is output at the DET pin.
0000 NRM1
Normal operation (Default)
0001 AVR
VREF adjustment Outputs the VREF voltage
0010 AIR
IREF adjustment Outputs the IREF current
0011 AFR
OSC adjustment Outputs the OSC signal
0100 ATO
Outputs the VTMP voltage
VTMP adjustment Adjust this voltage so that it matches the VREF
voltage at 25°C.
0101 ADT+
Positive judge
Outputs internally set positive determination
threshold adjustment threshold value
0110
ADT-
Negative judge
Outputs internally set negative determination
threshold adjustment threshold value
0111 AHY+
Positive hysteresis Outputs hysteresis voltage of the positive
voltage
comparator
1000 AHY-
Negative hysteresis Outputs hysteresis voltage of the negative
voltage
comparator
1001 APJ
Pressure judge
threshold adjustment
Outputs output determination threshold value
1010-
1111
Reserved
D[0] AEPEN[0]
EEPROM control
mode
Controls the EEPROM operation
0 NRM0
Intermittent EEPROM EEPROM normal operation (intermittent operation)
operation
(Default)
1 AEPD
EEPROM always on
EEPROM is always turned on.
Always turn on when adjusting the module.
Note) When using the IC adjustment mode for setting the VTMP output, make an additional setup
of AEPEN[0] = 1. In any other setup, the circuit is automatically always turned on.
MS1055-E-02
69
2011/12