AK8999A Datasheet, PDF (57/68 Pages) Asahi Kasei Microsystems – Pressure Sensor Control IC

CONFIDENTIAL
[AK8999A/AW/AD]
h) Pressure threshold detector 2 (EEPROM name: PTH2, HYS2)
The operating mode, the detection threshold values and the hysteresis voltage of the comparator for
the pressure threshold detector 2 are set up.
The detector threshold voltage and the hysteresis voltage vary ratiometrically with respect to the
supply voltage.
h.1) Pressure threshold detector operating mode setup
Address : 0A hex D[7:5] = EINV2[0], EINE2[0], EIN2L[0]
D[7:5] Symbol
Mode setup
D[7] EINV2[0] Pressure threshold detector output polarity setup EEPROM
0 EINV21 High output when detected (default)
1 EINV20 Low output when detected
D[6] EINE2[0] Pressure threshold detector enabled setup EEPROM
0 INT2E Pressure threshold detector 2 enable (default)
1 INT2D Pressure threshold detector 2 disable
D[5] EIN2L[0] Pressure threshold detector 2 detection threshold setup EEPROM
0 INT2< Detect pressure above threshold (default)
1 INT2> Detect pressure below threshold
h.2) Pressure threshold detector detection threshold adjustment
Address : 0A hex D[4:0] = EPT2[4:0]
EPT2[4:0]
Detection threshold (V)
Dec Hex
Bin
Detect threshold
ex. VDD:5V
-16 10
10000
0.900*VDD
4.500
-15 11
10001
0.875*VDD
4.375
-14 12
10010
0.850*VDD
4.250
：：
：
：
：
-3 1D
11101
0.575*VDD
2.875
-2 1E
11110
0.550*VDD
2.750
-1 1F
11111
0.525*VDD
2.625
0
00
00000
0.500*VDD
2.500
1
01
00001
0.475*VDD
2.375
2
02
00010
0.450*VDD
2.250
：：
：
：
：
13 0D
01101
0.175*VDD
0.875
14 0E
01110
0.150*VDD
0.750
15 0F
01111
0.125*VDD
0.625
Description
Default
h.3) Comparator hysteresis voltage adjustment for pressure threshold detection
Address : 0B hex D[3:2] = EHYS2[1:0]
EHYS2[1:0]
Dec Hex
Bin
Hysteresis voltage (mV)
Hysteresis voltage
ex. VDD:5V
Description
2
2
10
0.030*VDD
150.0
3
3
11
0.040*VDD
200.0
0
0
00
0.050*VDD
250.0
Default
1
1
01
0.060*VDD
300.0
MS1600-E-00
- 57 -
2014/05