AK09918 Datasheet, PDF (20/30 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

[AK09918]
11. Registers
11.1. Description of Registers
AK09918 has registers of 18 addresses as indicated in Table 11.1. . Every address consists of 8 bits data.
Data is transferred to or received from the external CPU via the serial interface described previously.
Name
WIA1
WIA2
RSV1
RSV2
ST1
HXL
HXH
HYL
HYH
HZL
HZH
TMPS
ST2
CNTL1
CNTL2
CNTL3
TS1
TS2
Address
00h
01h
02h
03h
10h
11h
12h
13h
14h
15h
16h
17h
18h
30h
31h
32h
33h
34h
READ/
WRITE
READ
READ
READ
READ
READ
READ
READ
READ
READ
READ
READ
READ
READ
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
Table 11.1. Register Table
Description
Company ID
Device ID
Reserved 1
Reserved 2
Status 1
Measurement Magnetic Data
Dummy
Status 2
Dummy
Control 2
Control 3
Test
Test
Bit
width
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Remarks
Data status
X-axis data
Y-axis data
Z-axis data
Dummy
Data status
Dummy
Control settings
Control settings
DO NOT ACCESS
DO NOT ACCESS
Addresses 00h to 18h, 30h to 32h are compliant with automatic increment function of serial interface
respectively. In other modes, read data is not correct. When the address is in 00h to 18h, the address is
incremented 00h  01h  02h  03h  10h  11h ...  18h, and the address goes back to 00h after
18h. When the address is in 30h to 32h, the address goes back to 30h after 32h.
016014242-E-00
- 20 -
2016/11