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AK8999AW Datasheet, PDF (62/68 Pages) Asahi Kasei Microsystems – Pressure Sensor Control IC
CONFIDENTIAL
[AK8999A/AW/AD]
n) VTMP voltage adjustment (EEPROM name: VTMP)
Compensates the offset values for the AK8999A's internal temperature sensor and external
temperature sensor. Adjusts the values so that the difference between VTMP voltage and VREF
voltage is close to 0 mV (If VREF is 1005mV, adjust so that VTMP is also 1005mV).
The coarse adjustment (ETM[8:6]) is invalid when the internal temperature sensor is used
(ETMP[1:0] = 2h). The coarse adjustment is effective when the external temperature sensor is used
(ETMP[1:0] = 0, 1h).
ΔVTMP in the table below indicates a value varying with the setup values of the EEPROM. The ratio
is benchmarked to 1000mV (VREF ideal value) as 100% (Ratio = ΔVTMP/1000[mV]*100[%]).
Address : 11 hex D[5:0] = ETM[5:0]
ETM[5:0]
Dec Hex
Bin
-32 20
100000
:
:
:
-16 30
110000
:
:
:
-8
38
111000
:
:
:
-4
3C
111100
:
:
:
-1
3F
111111
0
00
000000
1
01
000001
:
:
:
4
04
000100
:
:
:
8
08
001000
:
:
:
16
10
010000
:
:
:
31
1F
011111
Ratio
(%)
+6.4
:
+3.2
:
+1.6
:
+0.8
:
+0.2
0.0
-0.2
:
-0.8
:
-1.6
:
-3.2
:
-6.2
ΔVTMP
(mV)
+64
:
+32
:
+16
:
+8
:
+2
0
-2
:
-8
:
-16
:
-32
:
-62
Description
Default
Address : 10 hex D[6:4] = ETM[8:6]
ETM[8:6]
Ratio
Dec Hex
Bin
(%)
4
4
100
Setup prohibited
5
5
101
Setup prohibited
6
6
110
+20.0
7
7
111
+10.0
0
0
000
0.0
1
1
001
-10.0
2
2
010
-20.0
3
3
011
Setup prohibited
ΔVTMP
(mV)
Setup prohibited
Setup prohibited
+200
+100
0
-100
-200
Setup prohibited
Description
Default
MS1600-E-00
- 62 -
2014/05