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A1381 Datasheet(PDF) 14 Page - Allegro MicroSystems

Part No. A1381
Description  Programmable Linear Hall Effect Sensor ICs with Analog Output
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1381 Datasheet(HTML) 14 Page - Allegro MicroSystems

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Programmable Linear Hall Effect Sensor ICs with Analog Output
Available in a Miniature Thin Profile Surface Mount Package
A1381, A1382,
A1383, and A1384
14
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Try Mode
Try mode allows a single programmable parameter to be tested
without permanently setting its value. Multiple parameters cannot
be tested simultaneously in this mode. After powering the VCC
supply, select the desired parameter register and address its bit
field. When addressing the bit field, each VPM pulse increments
the value of the parameter register, up to the maximum possible
code (see Programming Logic table). The addressed parameter
value remains stored in the device even after the programming
drive voltage is removed from the VOUT pin, allowing the value
to be measured. Note that for accurate time measurements, the
blow capacitor, CBLOW, should be removed during output voltage
measurement.
It is not possible to decrement the value of the register without
resetting the parameter bit field. To reset the bit field, and thus the
value of the programmable parameter, cycle the supply (VCC) voltage.
Blow Mode
After the required value of the programmable parameter is found
using Try mode, its corresponding code should be blown to make
its value permanent. To do this, select the required parameter
register, and address and blow each required bit separately (as
described in the Fuse Blowing section). The supply must be
cycled between blowing each bit of a given code. After a bit is
blown, cycling the supply will not reset its value.
Lock Mode
To lock the device, address the LOCK bit and apply a blow pulse
with CBLOW in place. After locking the device, no future pro-
gramming of any parameter is possible.
Programming Modes


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