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A1389 Schematic ( PDF Datasheet ) - Allegro

Teilenummer A1389
Beschreibung Linear Hall-Effect Sensor IC
Hersteller Allegro
Logo Allegro Logo 




Gesamt 12 Seiten
A1389 Datasheet, Funktion
A1388 and A1389
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
Features and Benefits
• 5.0 V supply operation
• QVO temperature coefficient programmed at Allegrofor
improved accuracy
• Miniature package options
• High bandwidth, low noise analog output
• High speed chopping scheme minimizes QVO drift across
operating temperature range
• Temperature-stable quiescent voltage output and sensitivity
• Precise recoverability after temperature cycling
• Output voltage clamps provide short circuit diagnostic
capabilities
• Undervoltage lockout (UVLO)
• Wide ambient temperature range: –40°C to 150°C
• Immune to mechanical stress
• Enhanced EMC performance for stringent automotive
applications
Packages
3-pin SOT23-W
2 mm × 3 mm × 1 mm
(suffix LH)
3-pin ultramini SIP
1.5 mm × 4 mm × 3 mm
(suffix UA)
Description
New applications for linear output Hall-effect sensors, such
as displacement and angular position, require higher accuracy
and smaller package sizes. The Allegro A1388 and A1389
linear Hall-effect sensor ICs have been designed specifically to
meet both requirements. These temperature-stable devices are
available in both surface-mount and through hole packages.
The accuracy of each device is enhanced via end-of-line
optimization. Each device features non-volatile memory to
optimize device sensitivity and the quiescent voltage output
(QVO: output in the absence of a magnetic field) for a given
application or circuit. This A1388 and A1389 optimized
performance is sustained across the full operating temperature
range by programming the temperature coefficient for both
sensitivity and QVO at Allegro end-of-line test.
These ratiometric Hall-effect sensor ICs provide a voltage
output that is proportional to the applied magnetic field. The
quiescent voltage output is adjusted around 50% of the supply
voltage.
The features of these linear devices make them ideal for use in
automotive and industrial applications requiring high accuracy,
and they operate across an extended temperature range,
–40°C to 150°C.
Each BiCMOS monolithic circuit integrates a Hall element,
temperature-compensating circuitry to reduce the intrinsic
Approximate footprint
Continued on the next page…
V+
VCC
Functional Block Diagram
VOUT
CBYPASS
Sensitivity and
Sensitivity TC
Offset and
Offset TC
A13889-DS, Rev. 1
GND






A1389 Datasheet, Funktion
A1388 and
A1389
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
Characteristic Definitions
Power On Time When the supply is ramped to its operating
voltage, the device output requires a finite time to react to an
input magnetic field. Power On Time, tPO , is defined as the time
it takes for the output voltage to begin responding to an applied
magnetic field after the power supply has reached its minimum
specified operating voltage, VCC(min), as shown in figure 1.
Delay to Clamp A large magnetic input step may cause the
clamp to overshoot its steady state value. The Delay to Clamp,
tCLP , is defined as the time it takes for the output voltage to settle
within 1% of its steady state value, after initially passing through
its steady state voltage, as shown in figure 2.
Quiescent Voltage Output In the quiescent state (no signifi-
cant magnetic field: B = 0 G), the output, VOUT(Q), is at a con-
stant ratio to the supply voltage, VCC, across the entire operating
ranges of VCC and Operating Ambient Temperature, TA.
Quiescent Voltage Output Drift Across Temperature
Range Due to internal component tolerances and thermal
considerations, the Quiescent Voltage Output, VOUT(Q), may
drift due to temperature changes within the Operating Ambient
Temperature, TA. For purposes of specification, the Quiescent
Voltage Output Drift Across Temperature Range, ∆VOUT(Q) (mV),
is defined as:
V
VCC(typ)
90% VOUT
VCC
VOUT
VCC(min)
tPO
t1 t2
t1= time at which power supply reaches
minimum specified operating voltage
t2= time at which output voltage settles
within ±10% of its steady state value
under an applied magnetic field
0
Figure 1. Definition of Power On Time, tPO
+t
VCLPHIGH
Magnetic Input Signal
tCLP
VOUT
t1 t2
t1= time at which output voltage initially
reaches steady state clamp voltage
t2= time at which output voltage settles to
within 1% of steady state clamp voltage
time (µs)
Figure 2. Definition of Delay to Clamp, tCLP
VOUT(Q) = VOUT(Q)(TA) VOUT(Q)(25°C)
(1)
Sensitivity The amount of the output voltage change is propor-
tional to the magnitude and polarity of the magnetic field applied.
This proportionality is specified as the magnetic sensitivity,
Sens (mV/G), of the device and is defined as:
Sens = VOUT(B+) VOUT(B–)
(B+) – (B–)
(2)
where B+ is the magnetic flux density in a positive field (south
polarity) and B– is the magnetic flux density in a negative field
(north polarity).
Sensitivity Temperature Coefficient The device sensitivity
changes as temperature changes, with respect to its Sensitivity
Temperature Coefficient, TCSENS. TCSENS is programmed at
150°C, and calculated relative to the baseline sensitivity program-
ming temperature of 25°C. TCSENS is defined as:
TCSens
=
SensSTe2n–sTS1ensT1
×
100
T21–T1
(%/°C) (3)
where T1 is the baseline Sens programming temperature of 25°C,
and T2 is the TCSENS programming temperature of 150°C.
The ideal value of Sens across the full ambient temperature
range, SensIDEAL(TA), is defined as:
SensIDEAL(TA) = SensT1 × [100 (%) + TCSENS (TA T1)] (4)
Sensitivity Drift Across Temperature Range Second order
sensitivity temperature coefficient effects cause the magnetic
sensitivity, Sens, to drift from its ideal value across the operating
ambient temperature range, TA. For purposes of specification,
the Sensitivity Drift Across Temperature Range, ∆SensTC, is
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6

6 Page









A1389 pdf, datenblatt
A1388 and
A1389
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
Revision History
Revision
Rev. 1
Revision Date
June 27, 2014
Description of Revision
Update product offerings
Copyright ©2009-2014, Allegro MicroSystems, LLC
Allegro MicroSystems, LLC reserves the right to make, from time to time, such departures from the detail specifications as may be required to
permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that
the information being relied upon is current.
Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of
Allegro’s product can reasonably be expected to cause bodily harm.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties which may result from its use.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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