A1360 datasheet(14/25 Pages) ALLEGRO | Low-Noise Programmable Linear Hall Effect Sensor ICs with

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A1360, A1361,

and A1362

Overview

Programming is accomplished by sending a series of input volt-

age pulses serially through the VOUT pin of the device. A unique

combination of different voltage level pulses controls the internal

programming logic of the device to select a desired programmable

parameter and change its value.

There are three voltage levels that must be taken into account

when programming. These levels are referred to as high,

VP(HIGH), mid, VP(MID), and low, VP(LOW). There are two program-

ming pulse levels. A high voltage pulse, VPH, refers to a VP(LOW)

–VP(HIGH) –VP(LOW) sequence. A mid voltage pulse, VPM, refers

to a VP(LOW) –VP(MID) –VP(LOW) sequence.

The 136x features four modes used during programming: Hold

mode, Try mode, Blow mode, and Lock mode:

• In Hold mode, the value of two programmable parameters may

be set and measured simultaneously. The parameter values are

stored temporarily, and reset after cycling the supply voltage.

• In Try mode, the value of a single programmable parameter may

be set and measured. The parameter value is stored temporarily,

and resets after cycling the supply voltage. (Note that other

parameters cannot be accessed simultaneously in this mode.)

• In Blow mode, the value of a single programmable parameter

may be set permanently by blowing solid-state fuses internal to

the device. Additional parameters may be blown sequentially.

• In Lock mode, a device-level fuse is blown, blocking the further

programming of all parameters.

The programming sequence is designed to help prevent the device

from being programmed accidentally; for example, as a result of

noise on the supply line. Any programmable variable power sup-

ply can be used to generate the pulse waveforms, although Allegro

highly recommends using the Allegro Sensor IC Evaluation Kit,

available on the Allegro Web site On-line Store. The manual

for that kit is available for download free of charge, and provides

additional information on programming these devices.

Definition of Terms

control the bit fields storing the code choices for setting program-

ming modes and programmable parameters.

Bit Field The set of internal fuses controlled by a single register.

Each fuse in a bit field represents a binary digit in the code setting

for that register. The internal logic of the device interprets that

code and applies the result to a programmable parameter of the

device. Individual fuses can be temporarily activated for testing of

the result, or permanently blown.

Key A series of one or more consecutive mid voltage pulses that

indicate by their quantity the register being addressed. The quan-

tity of mid voltage pulses corresponds to the decimal equivalent

of the binary value of the register being addressed. For example,

the LSB of a zone is bit 0 (binary 0), corresponding to register 1,

and indicated by key 1 (decimal 1), a single mid voltage pulse.

Code A series of one or more consecutive mid voltage pulses that

indicate by their quantity the combination of fuses to be activated

or blown in the currently-selected register. The quantity of pulses

in the code corresponds to the decimal equivalent of the binary

value of the bits (links) to be activated or blown. The LSB of a bit

field is bit 0, activated by code 1 (decimal 1), a single mid voltage

pulse.

Addressing Indicating the target register or bit field setting by

incrementing the key or code by means of pulse trains of consecu-

tive mid voltage pulses transmitted through the VOUT pin of the

device. During the addressing process, each parameter can be

measured, before either blowing the fuses to permanently set the

programming code (and parameter value), or cycling the power to

reset the unblown bits.

Programming Guidelines

Low-Noise Programmable Linear Hall Effect Sensor ICs with

Adjustable Bandwidth (50 kHz Maximum) and Analog Output

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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