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A1381 Datasheet(PDF) 13 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) 13 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
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
in figure 3, decimal code 5 is equivalent to the binary number
101. Therefore bit 2 (code 4) must be addressed and blown, the
device power supply cycled, and then bit 0 (code 1) addressed
and blown. An appropriate sequence for blowing code 5 is shown
in figure 4. The order of blowing bits, however, is not important.
Blowing bit 0 first, and then bit 2 is acceptable.
Note: After blowing, the programming is not reversible, even
after cycling the supply power. Although a register bit field fuse
cannot be reset after it is blown, additional bits within the same
register can be blown at any time until the device is locked. For
example, if bit 1 (binary 10) has been blown, it is still possible to
blow bit 0. The end result would be binary 11 (decimal code 3).
Locking the Device
After the desired code for each parameter is programmed, the
device can be locked to prevent further programming of any
Additional Guidelines
The additional guidelines in this section should be followed to
ensure the proper behavior of these devices:
A 0.1 μF blowing capacitor, C
BLOW, must be mounted between
the VOUT pin and the GND pin during programming, to ensure
enough current is available to blow fuses.
The C
BLOW blowing capacitor must be replaced in the final
application with a suitable CL. (The maximum load capacitance
is 10 nF for proper operation.)
The power supply used for programming must be capable of
delivering at least 26 V and 300 mA.
Be careful to observe the t
LOW delay time before powering
down the device after blowing each bit.
The following programming order is recommended:
4. OUT(Q)
LOCK (only after all other parameters have been pro-
grammed and validated, because this prevents any further
programming of the device)
Figure 4. Example of programming pulses applied to the VOUT pin that
result in permanent parameter settings. In this example, the register cor-
responding to key 1 is selected and code 5 is addressed and blown.
(Key 1)
VCC = 0 V
(Key 1)
Programming of Code 5 in Key 1
(Code 4)
(Code 1)
(Code 4 in
Key 1)
(Code 1 in
Key 1)
VCC = 0 V
VCC = 0 V
Figure 3. Example of code 5 broken into its binary components, which are
code 4 and code 1.
(Decimal Equivalent)
Code 5
Bit Field Selection
Address Code Format
Code in Binary
Fuse Blowing
Target Bits
Fuse Blowing
Address Code Format
1 0 1
Bit 2
Bit 0
Code 4
Code 1
(Decimal Equivalents)

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