AK7401 Datasheet, PDF (23/29 Pages) Asahi Kasei Microsystems – Rotary Position Sensor IC

[AK7401]
6) E_MFDRH (Addr. 0x08)
DATA[11:0]
11
10
9
8
7
6
5
4
3
2
1
0
-
E_MFDRH[7:0]
These EEPROM contain the configuration data for upper limit of the magnetic flux density. This data is
used as a reference for magnetic flux density diagnostics. To validate the user configuration in Normal
Mode, store the configuration data to E_MFDRH via WriteEEPROM operation code in User Mode. The
default setting is “0x50” (approximately 80mT). The data resolution is about 1mT.
E_MFDRH level should be more than E_MFDRL level.
7) E_MFDRL (Addr. 0x09)
DATA[11:0]
11
10
9
8
7
6
5
4
3
2
1
0
-
E_MFDRL[7:0]
These EEPROM contain the configuration data for upper limit of the magnetic flux density. This data is
used as a reference for magnetic flux density diagnostics. To validate the user configuration in Normal
Mode, store the configuration data to E_MFDRL via WriteEEPROM operation code in User Mode. The
default setting is “0x05” (approximately 05mT). The data resolution is about 1mT.
E_MFDRL level should be less than E_MFDRH level.
8) E_PWMF, E_PWMPL (Addr. 0x0A)
DATA[11:0]
11
10
9
8
7
6
5
4
3
2
1
0
-
E_PWMPL[2:0]
E_PWMF[5:0]
These EEPROM contain the configuration data for PWM frequency and polarity. To validate the user
configuration in Normal Mode, store the configuration data to E_PWMPL and E_PWMF via
WriteEEPROM operation code in User Mode.
In plus polarity, PWM duty increases according to angle data increase.
In minus polarity, PWM duty increases according to angle data decrease.
PWM Polarity
E_PWMPL[2:0]
Default
plus
0x0
●
minus
0x7
WARNING: If a data except “0x0” and “0x7” is set to E_PWMPL[2:0] bits, PWM polarity can not be
guaranteed.
PWM Frequency
[Hz]
E_PWMF[5:0]
Default
1000
0x00
●
500
0x07
250
0x3F
WARNING: If a data except “0x0”, “0x7” and “0x3F” is set to E_PWMF[5:0] bits, PWM frequency can not
be guaranteed.
014002685-E-01
- 23 -
2015/07