AK8975 Datasheet, PDF (22/34 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

[AK8975/C]
8. Registers
8.1. Description of Registers
AK8975/C has registers of 19 addresses as indicated in Table 8.1. Every address consists of 8 bits data. Data is
transferred to or received from the external CPU via the serial interface described previously.
Name
WIA
INFO
ST1
HXL
HXH
HYL
HYH
HZL
HZH
ST2
CNTL
RSV
ASTC
TS1
TS2
I2CDIS
ASAX
ASAY
ASAZ
Address
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
READ/
WRITE
READ
READ
READ
READ
Description
Device ID
Information
Status 1
Measurement data
READ
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ
READ
READ
Status 2
Control
Reserved
Self-test
Test 1
Test 2
I²C disable
X-axis sensitivity adjustment value
Y-axis sensitivity adjustment value
Z-axis sensitivity adjustment value
Table 8.1 Register Table
Bit
width
8
8
8
8
8
8
8
8
8
8
8
Explanation
Data status
X-axis data
Y-axis data
Z-axis data
Data status
8 DO NOT ACCESS
8
8 DO NOT ACCESS
8 DO NOT ACCESS
8
8 Fuse ROM
8 Fuse ROM
8 ^{Fuse ROM}
Addresses from 00H to 0CH and from 10H to 12H are compliant with automatic increment function of serial
interface respectively. Values of addresses from 10H to 12H can be read only in Fuse access mode. In other
modes, read data is not correct.
MS1187-E-02
- 22 -
2010/05