AK8998 Datasheet, PDF (54/59 Pages) Asahi Kasei Microsystems – Preliminary

[AK8998/W/D]
o) User-writable data space (EEPROM name: UE)
Free area (EEPROM) available to the user.
Address : 12 hex D[7:0]=EUE[7:0]
Name
Content
Address
UE User-writable data 12 hex
Default
D7
EUE7
0
D6
EUE6
0
D5
EUE5
0
Data
D4 D3
EUE4 EUE3
0
0
D2
EUE2
0
D1
EUE1
0
D0
EUE0
0
p) Control register access setup (EEPROM name: MM2)
The access setup to the control register (volatile memory) is performed.
When the control register access setup is disabled (ETST[0]=0h), the control register (C
address: 00h) is fixed to the initial value, and cannot be accessed, unless control register access
is validated.
Address : 1D hex D[0]= ETST[0]
D[0] Symbol
Mode setup
D[0] ETST[0] Control register access setup
0 TSTDS Control register access disable(default)
1 TSTEN Control register access enable
q) EEPROM Write Enable setup (EEPROM name:EWE)
The EEPROM write enable setup is performed.
When the setup of EEPROM Write Enable is validated (EWE[0]=1h), the writing to EEPROM is
permitted. If it is invalid, the writing to EEPROM other then EEPROM Write Enable (address: 00
-1Dh, 1Fh) becomes impossible. And this address cannot be written by batch writing. However,
EEPROM read (all the addresses) is possible even in that case.
Address : 1E hex D[0]= EWE[0]
D[0] Symbol
Mode setup
D[0]
EWE[0] EEPROM Write Enable setup
0 WEDS EEPROM Write disable (default)
1 WEEN EEPROM Write enable
r) EEPROM batch write mode (EEPROM name: AW)
Initializes the addresses 00 hex to 1D hex in the EEPROM map at once or writes identical
data. This address is not available in the EEPROM.
Address : 1F hex D[7:0]=EAW[7:0]
Name
AW
Content
EEPROM
batch write
Address
1F hex
D7
EAW7
D6
EAW6
D5
EAW5
Data
D4 D3
EAW4 EAW3
D2
EAW2
D1
EAW1
D0
EAW0
MSxxxxx-E-00
- 51 -
2011/12