AK8973 Datasheet, PDF (27/31 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

ASAHI KASEI
9.3. Memory Map
Table 6 indicates the EEPROM memory map. There are eight addresses in total.
[AK8973]
Do not rewrite any data written in the EEPROM.
Name
ETS
EVIR
EIHE
ETST
EHXGA
EHYGA
EHZGA
WRAL1
Address
A7 to A0
62H
63H
64H
65H
66H
67H
68H
60H
Data
Description
Offset adjustment for temperature sensor [5:0]
VREF (EVIR[7:4]) & IREF (EVIR[3:0])
adjustment value
HE drive power supply correction value [7:4] &
OSC adjustment value [3:0]
For testing
Magnetic sensor X-axis gain adjustment value
Magnetic sensor Y-axis gain adjustment value
Magnetic sensor Z-axis gain adjustment value
Address for batch EEPROM write
Table 6
Number Factory-set
of bits
value
8
Individual
adjustment value
8
Individual
adjustment value
8
Individual
adjustment value
8
Individual
adjustment value
8
Individual
adjustment value
8
Individual
adjustment value
8
Individual
adjustment value
-
-
<ETS, EVIR, EIHE>
These data items are internally connected to registers of AK8973 to directly control adjustment values. Data
other than ETS, EVIR, and EIHE is not directly connected to internal registers of AK8973.
<ETST>, <WRAL1>
Addresses for testing. Usually, do not access these addresses.
<EHXGA, EHYGA, EHZGA>
These addresses are used for magnetic sensor adjustment. These data items are read and set to HXGA, HYGA
and HZGA registers respectively to adjust the sensitivity of each axis of the magnetic sensors.
At addresses other than the above addresses, the EEPROM circuit of AK8973 does not operate.
MS0561-E-01 <Preliminary>
- 27 -
2007/01