AK8996 Datasheet, PDF (62/74 Pages) Asahi Kasei Microsystems – Pressure Sensor Interface IC

[AK8996/W]
h) Pressure detector threshold (Register name: PTH)
Sets up the pressure detector's detection threshold values.
The detector threshold voltage varies ratiometrically with respect to the supply voltage. The
thresholds for positive (+) and negative (-) comparators cannot be defined independently.
Address: 10 hex D[3:0]=EPT[3:0]
EPT[3:0]
Dec Hex
Bin
Detection threshold (V)
Detection
ex. VDD: 5V
threshold _{+ve side}
-ve side
Comments
-8 8
1000
0.50*VDD
2.50
2.50
-7 9
1001
0.53*VDD
2.65
2.35
-6 A
1010
0.56*VDD
2.80
2.20
-5 B
1011
0.59*VDD
2.95
2.05
-4 C
1100
0.62*VDD
3.10
1.90
-3 D
1101
0.65*VDD
3.25
1.85
-2 E
1110
0.68*VDD
3.40
1.60
-1 F
1111
0.71*VDD
3.55
1.45
00
0000
0.74*VDD
3.70
1.30
Default
11
0001
0.77*VDD
3.85
1.15
22
0010
0.80*VDD
4.00
1.00
33
0011
0.83*VDD
4.15
0.85
44
0100
0.86*VDD
4.30
0.70
55
66
77
0101
0110
0111
0.89*VDD
0.92*VDD
0.95*VDD
4.45
4.60
4.75
0.55
0.40
0.25
Note)
Note)
Note) When EVD[0]:1 is used, setup of VDD: 2.2 to 3.6 V and EPT[3:0]:6h, 7h is prohibited.
i) Comparator hysteresis voltage adjustment for pressure detection (Register name: HYS)
The hysteresis voltage of the comparator for the pressure detector is set up.
The hysteresis voltage varies ratiometrically with respect to the supply voltage. The hysteresis
voltages for positive (+) and negative (-) comparators cannot be defined independently.
Address: 11 hex D[2:0]=EHYS[2:0]
EHYS[2:0]
Dec Hex
Bin
Hysteresis voltage (mV)
Hysteresis voltage
ex. VDD: 5V
Comments
0
0
000
0.0200*VDD
-100.0
Default
1
1
001
0.0175*VDD
-87.5
2
2
010
0.0150*VDD
-75.0
3
3
011
0.0125*VDD
-62.5
4
4
100
0.0100*VDD
-50.0
5
5
101
0.0075*VDD
-37.5
6
6
110
0.0050*VDD
-25.0
7
7
111
0.0025*VDD
-12.5
Note) See Functional Description 10) Note on the pressure detection circuit hysteresis voltage
setup
MS1055-E-02
62
2011/12