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PDF A1386 Data sheet ( Hoja de datos )
| Número de pieza | A1386 | |
| Descripción | 5V Field-Programmable Linear Hall Effect Sensor IC | |
| Fabricantes | Allegro | |
| Logotipo |  |
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A1386
5 V Field-Programmable Linear Hall Effect Sensor IC
with 3 V Supply Functionality, Analog Output, and Miniature Package Options
Features and Benefits
• Low power consumption using 3 V supply
• Factory programmed sensitivity temperature coefficient
(0.13%/°C nominal)
• Programmability at end-of-line
• Ratiometric sensitivity, quiescent voltage output, and
clamps for interfacing with application DAC
• Temperature-stable quiescent voltage output and sensitivity
• Precise recoverability after temperature cycling
• Output voltage clamps provide short circuit diagnostic
capabilities
• Wide ambient temperature range: –40°C to 150°C
• Resistant to mechanical stress
• Miniature package options
Packages
3-pin ultramini SIP
1.5 mm × 4 mm × 3 mm
(suffix UA)
Description
The Allegro® A1386 programmable, linear, Hall effect sensor
IC is designed for low power, high accuracy, and small package
size applications. The accuracy of this device is enhanced via
programmability on the output pin for end-of-line optimization
without the added complexity and cost of a fully programmable
device.
The A1386 has two operating modes, normal and low power.
In normal operation mode the A1386 operates much like its
predecessors, theA1381,A1382,A1383, andA1384, as a highly
accurate, user-programmable linear sensor IC with a ratiometric
output. In low power mode, the device actually disengages some
internal components in order to reduce power consumption.
Although the accuracy of the device is substantially reduced
during low power operation, it remains effective as a detector
of magnetic regions (such as north and south poles on a rotating
ring magnet). This unique feature allows the device to be used
in systems that are put to sleep, during which time there may
be only 3 V available, or in applications that have start-up
conditions where the available supply voltage may drop below
4.5 V for a period of time.
This ratiometric Hall effect device provides a voltage output
that is proportional to the applied magnetic field over the entire
Approximate scale
Continued on the next page…
Functional Block Diagram
V+
VCC
Chip Reference
Currents
To all subcircuits
CBYPASS
A1386-DS, Rev. 3
Amp
Out VOUT
GND
Hall Drive Circuit
Gain
Gain Temperature
Coefficient
Offset
Trim Control
1 page  
A1386
5 V Field-Programmable Linear Hall Effect Sensor IC with 3 V Supply
Functionality Analog Output, and Miniature Package Options
OPERATING CHARACTERISTICS (continued), valid over full operating temperature range, TA; CBYPASS= 0.1 μF, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ. Max. Units1
Drift Characteristics
Quiescent Voltage Output Drift
Through Temperature Range2
Maximum Sensitivity Drift
ThroughTemperature Range14,15
Sensitivity Drift Due to Package
Hysteresis2,15
∆VOUT(Q)
∆SensTC
∆SensPKG
VCC = VCC(NORM), Sens = 3.3 mV/G, TA = 25°C to 150°C
VCC = VCC(LOWPWR), Sens = 1.75 mV/G, TA = 25°C to 150°C
VCC = VCC(NORM)
VCC = VCC(LOWPWR)
TA = 25°C; after temperature cycling
–
–
–
–
–
– ±35 mV
±35 – mV
±3 – %
±5 – %
±2 – %
11G (gauss) = 0.1 mT (millitesla).
2See Characteristic Definitions section.
3fC varies up to approximately ± 20% over the full operating ambient temperature range, TA, and process.
4Sens, VOUT(Q), VCLP(LOW) , and VCLP(HIGH) scale with VCC due to ratiometry.
5For optimal device accuracy in the VCC(NORM) operating range, the device should be programmed with VCC = 5 V.
6VOUT(Q)(max) is the value available with all programming fuses blown (maximum programming code set). The VOUT(Q) range is the total range from
VOUT(Q)init up to and including VOUT(Q)(max). See Characteristic Definitions section.
7Step size is larger than required, to account for manufacturing spread. See Characteristic Definitions section.
8Non-ideal behavior in the programming DAC can cause the step size at each significant bit rollover code to be greater than twice the maximum
specified value of StepVOUT(Q) or StepSENS.
9Overall programming value accuracy. See Characteristic Definitions section.
10Sens(max) is the value available with all programming fuses blown (maximum programming code set). Sens range is the total range from Sensinit up
to and including Sens(max). See Characteristic Definitions section.
11Factory programmed at 150°C and calculated relative to 25°C.
12Percent change from actual value at VCC = 3 V or VCC = 5 V, for a given temperature, over the guaranteed supply voltage operating range.
13Percent change from actual value at VCC = 3 V or VCC = 5 V, with TA = 25°C, over the guaranteed supply voltage operating range.
14Sensitivity drift from expected value of VOUT at TA , after programming TCSENS. See Characteristic Definitions section.
15Guaranteed by design only. Parameter is not tested in production flow.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A1386
5 V Field-Programmable Linear Hall Effect Sensor IC with 3 V Supply
Functionality Analog Output, and Miniature Package Options
Programming Guidelines
Overview
Definition of Terms
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 target programmable
parameter and change its value. There are two programming
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 A1386 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 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 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 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.
Although any programmable variable power supply can be used
to generate the pulse waveforms, Allegro highly recommends
using the Allegro Sensor Evaluation Kit, available on the Allegro
website On-line Store. The manual for that kit is available for
download free of charge, and provides additional information on
programming these devices.
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 Pulse Requirements, Protocol at TA = 25°C
Characteristic
Symbol
Notes
Programming Voltage
Programming Current
VP(LOW)
VP(MID)
VP(HIGH)
IP
Measured at the VOUT pin.
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.
Pulse Width
Pulse Rise Time
Pulse Fall Time
tOFF(HIGH)
tOFF(MID)
tACTIVE(HIGH)
tACTIVE(MID)
tBLOW
tPr
tPf
Duration at VP(LOW) level following a VP(HIGH) level.
Duration at VP(LOW) level following a VP(MID) level.
Duration of VP(HIGH) level for VPH pulses during key/code selection.
Duration of VP(MID) level for VPH pulses during key/code selection.
Duration at VP(HIGH) level for fuse blowing.
Rise time required for transitions from VP(LOW) to either VP(MID) or VP(HIGH).
Fall time required for transitions from VP(HIGH) to either VP(MID) to VP(LOW).
Min.
-
14
26
300
30
5
30
15
30
1
1
Typ.
-
15
27
-
-
-
-
-
-
-
-
Max. Units
5.5 V
16 V
28 V
- mA
- μs
- μs
- μs
- μs
- μs
100 μs
100 μs
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet A1386.PDF ] | |
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