AK8998 Datasheet, PDF (47/59 Pages) Asahi Kasei Microsystems – Preliminary

[AK8998/W/D]
g) Pressure detector 2 (EEPROM name: PTH2, HYS2)
The operating mode, the detection threshold values and the hysteresis voltage of the comparator
for the pressure detector 2 are individually set up.
The detector threshold voltage varies and the hysteresis voltage ratiometrically with respect to
the supply voltage.
g-1) Pressure detector operating mode setup
Address : 08 hex D[7:5] = EINV2[0], EINE2[0], EIN2L[0]
D[7:5] Symbol
Mode setup
D[7]
EINV2[0] Pressure detector output polarity setup EEPROM
0 EINV21 High output when detected (default)
1 EINV20 Low output when detected
D[6]
EINE2[0] Pressure detector enabled setup EEPROM
0 INT2E Pressure detector 2 enable (default)
1 INT2D Pressure detector 2 disable
D[5]
EIN2L[0] Pressure detector 2 detection threshold setup EEPROM
0 INT2< Detect pressure above threshold (default)
1 INT2> Detect pressure below threshold
g-2) Pressure detector detection threshold adjustment
Address : 08 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
0
00
11111
00000
0.525*VDD
0.500*VDD
2.625
2.500
1
01
00001
0.475*VDD
2.375
2
02
：：
13 0D
00010
：
01101
0.450*VDD
：
0.175*VDD
2.250
：
0.875
14 0E
01110
0.150*VDD
0.750
15 0F
01111
0.125*VDD
0.625
Comments
Default
g-3) Comparator hysteresis voltage adjustment for pressure detection
Address : 09 hex D[3:2]=EHYS2[1:0]
EHYS2[1:0]
Dec Hex
Bin
Hysteresis voltage (mV)
Hysteresis voltage
ex. VDD:5V
Comments
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
MSxxxxx-E-00
- 44 -
2011/12