Datasheet

[AK09918]
016014242-E-00 2016/11
- 22 -
11.3. Detailed Description of Register
WIA: Who I Am 11.3.1.
Addr.
Register
name
D7
D6
D5
D4
D3
D2
D1
D0
Read-only register
00h
WIA1
0
1
0
0
1
0
0
0
01h
WIA2
0
0
0
0
1
1
0
0
WIA1[7:0] bits: Company ID of AKM. It is described in one byte and fixed value.
48h: fixed
WIA2[7:0] bits: Device ID of AK09918. It is described in one byte and fixed value.
0Ch: fixed
RSV: Reserved 11.3.2.
Addr.
Register
name
D7
D6
D5
D4
D3
D2
D1
D0
Read-only register
02h
RSV1
RSV17
RSV16
RSV15
RSV14
RSV13
RSV12
RSV11
RSV10
03h
RSV2
RSV27
RSV26
RSV25
RSV24
RSV23
RSV22
RSV21
RSV20
RSV1[7:0] bits/ RSV2[7:0] bits: Reserved register for AKM.
ST1: Status 1 11.3.3.
Addr.
Register
name
D7
D6
D5
D4
D3
D2
D1
D0
Read-only register
10h
ST1
0
0
0
0
0
0
DOR
DRDY
Reset
0
0
0
0
0
0
0
0
DRDY: Data Ready
“0”: Normal
“1”: Data is ready
DRDY bit turns to “1” when data is ready in Single measurement mode, Continuous measurement mode 1, 2,
3, 4 or Self-test mode. It returns to “0” when any one of ST2 register or measurement data register (HXL to
TMPS) is read.
DOR: Data Overrun
“0”: Normal
“1”: Data overrun
DOR bit turns to “1” when data has been skipped in Continuous measurement mode 1, 2, 3, 4. It returns to “0”
when any one of ST2 register or measurement data register (HXL to TMPS) is read.