AK8998 Datasheet, PDF (50/59 Pages) Asahi Kasei Microsystems – Preliminary

[AK8998/W/D]
j) measurement mode setup (EEPROM name: MM)
EEPROM is used for setting up the measurement mode for the AK8998.
A setup of a sampling frequency, supply voltage & sensor drive voltage, the enable / disable of
Internal SCF & SMF, the internal / external of a temperature sensor, and the internal switching of
VP & VN can be performed.
Address : 0D hex D[7:0]= EAGND[0], EVPN[0], ETMP[0], ESCF[1:0], EVD[1:0], ESF[0]
D[7:0] Symbol
Mode setup
D[7] EAGND[0] AGND pin setup EEPROM
0 AGNDD AGND pin disable (default)
1 AGNDE AGND pin enable
D[6] EVPN[0] VP & VN internal switching EEPROM
0 VPNN VP->VP, VN->VN (default)
1 VPNR VP->VN, VN->VP
D[5] ETMP[0] Temperature sensor Internal & External change EEPROM
0
TMPE
External temperature sensor use (default)
*Cannot be used in Sampling frequency as 1kHz (ESF[0]=1h).
1 TMPI Internal temperature sensor use
D[4:3] ESCF[1:0] Internal SCF & SMF setup EEPROM
00 SCDS Internal SCF & SMF disable (default)
01 SCEN1 Internal SCF & SMF enable & Cutoff frequency 1kHz
10 SCEN2 Internal SCF & SMF enable & Cutoff frequency 500Hz
11 SCEN3 Internal SCF & SMF enable & Cutoff frequency 250Hz
D[2:1] EVD[1:0] Supply voltage & sensor drive voltage setup EEPROM
00 VDD504 Supply voltage at 5V & sensor drive voltage at 4V (default)
01 VDD502 Supply voltage at 5V & sensor drive voltage at 2.2V
10 VDD332 Supply voltage at 3.3V & sensor drive voltage at 2.2V
11 VDD302 Supply voltage at 3V & sensor drive voltage at 2.2V
D[0]
ESF[0] Sampling frequency setup EEPROM
0 SF10 Sampling frequency 10kHz (default)
Sampling frequency 1kHz
1
SF1
*Cannot be used at the time of External temperature sensor is
used (ETMP[0]=0h).
MSxxxxx-E-00
- 47 -
2011/12