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High Precision Linear Hall-Effect Sensor IC
With an Open Drain Pulse Width Modulated Output
A1356
19
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
After the initial 50 ms has elapsed, the duty cycle will correspond
to an applied magnetic field as expected. The 50 ms calibration
test time corresponds with a target PWM frequency of 2 kHz. If
the PWM frequency is programmed away from its target of 2 kHz,
the duration of the calibration test time will scale inversely with the
change in PWM frequency.
This test mode is optional and must be enabled by blowing its
programming bit. After the test mode bit has been blown, the device
enters Output Calibration mode every time the device is powered-on.
This test mode is provided so that the user can compensate for
differences in the ground potential between the A1356 and any
interface circuitry used to measure the pulse width of the A1356
output.
Figure 11. After powering-on, the A1356 outputs a 50% DC for the first 50 ms, regardless of the applied magnetic
field (Output Calibration mode in effect). After the initial 50 ms has elapsed, the output responds to a magnetic field
as expected. The example in this figure assumes that a large +B field is applied to the device after the initial 50 ms.
Calibration sequence
PWM proportional to
magnetic field
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