MA700GQ-P Datasheet, PDF (10/15 Pages) MPS Industries, Inc. – Angular Sensor for Position Control with Side-Shaft Positioning Capability

MA700
Angular Sensor for Position Control with
Side-Shaft Positioning Capability
Incremental - ABZ
With the ABZ output the MA700 emulates a 10-bit
incremental encoder, such as an optical encoder,
providing logic pulses in quadrature (see Figure 13).
Compared to A, the signal B is shifted by a quarter of
pulse period. Over one revolution the A signal pulses
256 times. It makes 1024 edges per revolution. The
signal Z (“Zero” or “Index”) raises only once per turn,
at the zero angle position.
Figure 13 : ABZ Output during Rotation
11. 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.
Figure 14: 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, 4 and the 5.
Monolithic Power Systems, Inc. | Gland, Switzerland | Tel: [phone] | [e-mail] | www.sensimatech.com
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Reserved. MA700 Rev 1.0 September 2014
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