參數(shù)資料
型號(hào)： A1351LKTTN-T
廠商： Allegro Microsystems Inc
文件頁(yè)數(shù)： 15/24頁(yè)
文件大?。?/td> 663K
描述： IC SENSOR HALL EFFECT 4-SIP
產(chǎn)品培訓(xùn)模塊： Current Sensor
標(biāo)準(zhǔn)包裝： 1
傳感范圍： 0.055% ~ 0.095% DC/G
類型： 線性 - 單極，雙極
電源電壓： 4.5 V ~ 5.5 V
電流 - 電源： 10mA
電流 - 輸出（最大）： 1mA
輸出類型： 數(shù)字，推挽式
特點(diǎn)： 高精度
工作溫度： -40°C ~ 125°C
封裝/外殼： 4-SIP
供應(yīng)商設(shè)備封裝： 4-SIP
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 1139 (CN2011-ZH PDF)
其它名稱： 620-1228-6
A1351
High Precision Linear Hall Effect Sensor IC
 with a Push/Pull, Pulse Width Modulated Output
14
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Overview
Programming is accomplished by sending a series of input volt-
age pulses serially through the PWMOUT 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,
V
P(HIGH)
, mid, V
P(MID)
, and low, V
P(LOW)
. There are two program-
ming pulse levels. A high voltage pulse, V
PH
, refers to a V
P(LOW)
 
V
P(HIGH)
 V
P(LOW)
 sequence. A mid voltage pulse, V
PM
, refers to
a V
P(LOW)
 V
P(MID)
 V
P(LOW)
 sequence.
The 1351 features three modes used during programming: Try
mode, Blow mode, and Lock mode:
" 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
Register One of several sections of the programming logic that 
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 key 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 PWMOUT 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.
Fuse Blowing Applying a high voltage pulse of sufficient duration 
to permanently set an addressed bit by blowing a fuse internal to
the device. After a bit (fuse) has been blown, it cannot be reset.
Blow Pulse A high voltage pulse of sufficient duration to blow the 
addressed fuse.
Cycling the Supply Powering-down, and then powering-up the 
supply voltage. Cycling the supply is used to clear the program-
ming settings in Try mode.
Programming Guidelines
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