AK7401 Datasheet, PDF (13/29 Pages) Asahi Kasei Microsystems – Rotary Position Sensor IC

[AK7401]
16. Self-diagnostic Function
The AK7401 has several self-diagnostic functions to detect a function failure, a mismatch of EEPROM
data and an out-of-range operating condition. In User Mode, each diagnostic function can be disabled
but it is strongly recommended to enable all diagnostic functions for the system robustness.
● Startup Sequence Diagnostic Function
The AK7401 indicates an error during the startup sequence. This error sets the PWM output to low
level and error bit to “0”.
● Mismatch Detection among EEPROM Data
The AK7401 indicates an error when there is a mismatch of the triple-redundant configuration
EEPROM data. This error sets the PWM output to low level and error bit to “0”.
● Mismatch Detection between Transfer Buffer Register and EEPROM Data
The AK7401 indicates an error when there is a mismatch between the transfer buffer register and the
EEPROM data. This error sets the PWM output to low level and error bit to “0”.
● Mismatch Detection between Configuration Register and Transfer Buffer Register
The AK7401 indicates an error when there is a mismatch between the configuration register and the
transfer buffer register. This error sets the PWM output to low level and error bit to “0”.
● Analog Signal Sequence Diagnostic Function
The AK7401 indicates an error when there is a failure in analog signal processing sequence. This
error sets the PWM output to low level and error bit to “0”.
● Under or Over Magnetic Flux Density Detection
The AK7401 indicates an error when the magnetic flux density is undersupplied (default setting Typ.
B<5mT) or oversupplied (default setting Typ. B>80mT). This error sets the PWM output to low level
and error bit to “0”.
● PWM Duty Over Range Diagnostic Function
The AK7401 indicates an error when there is a deviation from the normal duty cycle range (10 to
90%). This error sets the PWM output to low level.
● Configuration Register Reloading Sequence Diagnostic Function
The AK7401 indicates an error when there is a failure in reloading sequence for the configuration
register from EEPROM. This error sets the PWM output to low level and error bit to “0”.
014002685-E-01
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2015/07