MA120GQ-Z Datasheet, PDF (9/14 Pages) MPS Industries, Inc. – Angular Sensor for 3-Phase Brushless Motor Commutation

MA120
Angular Sensor for 3-Phase Brushless Motor
Commutation
Figure 8: UVW Output during Rotation
10. OTP Programming
The One-Time-Programmable (OTP) memory can
permanently store the content of the programmable
registers. The OTP memory is made of poly-silicon
fuses. By activating the “flash” command the content
of the entire register will be stored in the OTP memory.
The flash command consists in setting some bits
(named Fn, where n is the register number) in the
register 9. When the bit Fn is set, the register n is
stored permanently. Important: the user can flash
only one register at the time. It is possible to operate
the MagAlpha without flashing the registers (see
Figure 9).
Figure 9: Circuit for Flashing
The burning of the fuses during the flash process is
irreversible: once a register is flashed the default values
at power up will always be the same. After flashing the
registers content cannot be modified anymore.
Flashing procedure
Prior to flashing, it is recommended to test the
MagAlpha with the new settings and verify the
performance of the sensor.
Once satisfied, the user can proceed with the flashing:
- Send the parameter to the register, and read
back for verification.
- Tie the VFLASH pin to 3.6 V. Note: it is
possible to supply both VDD and VFLASH
with the same 3.6 V source.
- In the register 9, set the bit corresponding to
the register to be flashed.
- Untie the VFLASH pin
Then switch off and on and check by reading back the
register content.
Example: set & flash the zero position at 50 deg
Note: permanently storing the zero position requires to
burn two registers, the 4 and the 5.
1. Convert into binary: within a resolution of 8
bits, 50 deg is the binary number 00100011
(49.22 deg).
2. Store the value (00100011) of the zero
position into register 4:
command reg. address MSB
value
LSB
0010 0100 00100011
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Reserved. MA700 Rev 1.0 September 2014
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