AK7401 Datasheet, PDF (10/29 Pages) Asahi Kasei Microsystems – Rotary Position Sensor IC

[AK7401]
User Mode
In User Mode, it is able to access the internal configuration register and EEPROM.
To set the following parameters in Normal Mode, configuration data need to be
stored in EEPROM.
1. Zero Degree Point
Configuration of the zero degree point defines the origin of the output angle
data. It is programmable at any angle position.
2. Magnet Rotation Direction
Configuration of the magnet rotation direction defines the increase or
decrease of the output angle data relative to the magnet rotation direction.
When it is selected to CCW, the output angle data increases in response to
counter-clockwise direction magnet rotation.
3. Angle Data Averaging
Configuration of angle data averaging provides OFF, SPC and HP settings.
In OFF setting, the AK7401 calculates the angle data without averaging
procedure. In SPC setting, the AK7401 calculates the angle data by 2 times
averaging. In HP setting, the AK7401 calculates the angle data by 8 times
averaging.
4. PWM Frequency
Configuration of PWM frequency provides 250, 500 and 1000Hz settings.
5. PWM Polarity
Configuration of PWM polarity provides plus and minus polarity settings. In
plus polarity settings, the highest angle data corresponds to maximum
PWM duty.
6. OUT Pin Output Type
Configuration of the OUT pin output type provides Push-Pull and NMOS
Open-Drain.
7. Magnetic Flux Density Detection Range
Configuration of magnetic flux density detection range provides under limit
setting and upper limit setting.
8. Self-diagnostic Configuration
Configuration of self-diagnosis defines the activation or inactivation of each
self- diagnostic functions.
9. Memory Lock
In order to prevent rewriting EEPROM incorrectly, it is able to lock the
memory. Once the configuration of memory lock is enabled, it is not
possible to change EEPROM anymore.
In User Mode, the OUT pin goes to high-impedance (Hi-Z) output.
Electrical and magnetic characteristics are not guaranteed in User Mode.
014002685-E-01
- 10 -
2015/07