[AK8975/C]

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

Address

READ/

WRITE

Description

Bit

width

Explanation

WIA

00H

READ

Device ID

8

INFO

01H

READ

Information

8

ST1

02H

READ

Status 1

8

Data status

HXL

03H

8

HXH

04H

8

X-axis data

HYL

05H

8

HYH

06H

8

Y-axis data

HZL

07H

8

HZH

08H

READ

Measurement data

8

Z-axis data

ST2

09H

READ

Status 2

8

Data status

CNTL

0AH

READ/

WRITE

Control

8

RSV

0BH

READ/

WRITE

Reserved

8

DO NOT ACCESS

ASTC

0CH

READ/

WRITE

Self-test

8

TS1

0DH

READ/

WRITE

Test 1

8

DO NOT ACCESS

TS2

0EH

READ/

WRITE

Test 2

8

DO NOT ACCESS

I2CDIS

0FH

READ/

WRITE

8

ASAX

10H

READ

X-axis sensitivity adjustment value

8

Fuse ROM

ASAY

11H

READ

Y-axis sensitivity adjustment value

8

Fuse ROM

ASAZ

12H

READ

Z-axis sensitivity adjustment value

8

Fuse ROM

Table 8.1 Register Table

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