Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

A1381 Datasheet(PDF) 11 Page - Allegro MicroSystems

Part No. A1381
Description  Programmable Linear Hall Effect Sensor ICs with Analog Output
Download  19 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
Logo 

A1381 Datasheet(HTML) 11 Page - Allegro MicroSystems

Zoom Inzoom in Zoom Outzoom out
 11 / 19 page
background image
Programmable Linear Hall Effect Sensor ICs with Analog Output
Available in a Miniature Thin Profile Surface Mount Package
A1381, A1382,
A1383, and A1384
11
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Programming Pulse Requirements, Protocol at TA = 25°C
Characteristic
Symbol
Notes
Min. Typ. Max. Units
Programming Voltage
VP(LOW)
Measured at the VOUT pin.
-
-
5.5
V
VP(MID)
14
15
16
V
VP(HIGH)
26
27
28
V
Programming Current
IP
Minimum supply current required to ensure proper fuse blowing. In addition, a min-
imum capacitance, CBLOW = 0.1 μF, must be connected between the VOUT and
GND pins during programming to provide the current necessary for fuse blowing.
300
-
-
mA
Pulse Width
tOFF(HIGH)
Duration at VP(LOW) level following a VP(HIGH) level.
30
-
-
μs
tOFF(MID)
Duration at VP(LOW) level following a VP(MID) level.
5
-
-
μs
tACTIVE(HIGH) Duration of VP(HIGH) level for VPH pulses during key/code selection.
30
-
-
μs
tACTIVE(MID) Duration of VP(MID) level for VPH pulses during key/code selection.
15
-
-
μs
tBLOW
Duration at VP(HIGH) level for fuse blowing.
30
-
-
μs
Pulse Rise Time
tPr
Rise time required for transitions from VP(LOW) to either VP(MID) or VP(HIGH).
1
-
100
μs
Pulse Fall Time
tPf
Fall time required for transitions from VP(HIGH) to either VP(MID) to VP(LOW).
1
-
100
μs
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 program-
mable parameter and change its value. There are two program-
ming pulses, referred to as a high voltage pulse, VPH, consisting
of a VP(LOW) –VP(HIGH) –VP(LOW) sequence and a mid voltage
pulse, VPM, consisting of a VP(LOW) –VP(MID) –VP(LOW) sequence.
The 138x features 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 temporar-
ily, 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 permanently set 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 fur-
ther 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.
Although any programmable variable power supply can be
used to generate the pulse waveforms, Allegro highly recom-
mends 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. The section of the programming logic that controls the
choice of programmable modes and parameters.
Bit Field. The internal fuses unique to each register, represented
as a binary number. Incrementing the bit field of a particular
register causes its programmable parameter to change, based on
the internal programming logic.
Key. A series of VPM voltage pulses used to select a register, with
a value expressed as the decimal equivalent of the binary value.
The LSB of a register is denoted as key 1, or bit 0.
Code. The number used to identify the combination of fuses
activated in a bit field, expressed as the decimal equivalent of the
binary value. The LSB of a bit field is denoted as code 1, or bit 0.
Addressing. Incrementing the bit field code of a selected register
by serially applying a pulse train through the VOUT pin of the
device. Each parameter can be measured during the addressing
process, but the internal fuses must be blown before the program-
ming code (and parameter value) becomes permanent.
Fuse Blowing. Applying a VPH voltage pulse of sufficient dura-
tion at the VP(HIGH) level to permanently set an addressed bit by
blowing a fuse internal to the device. Once a bit (fuse) has been
blown, it cannot be reset.
Blow Pulse. A VPH voltage pulse of sufficient duration at the
VP(HIGH) level 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


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn