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A1359
Factory-Programmed Dual Output Linear Hall Effect Sensor IC
With Analog and Pulse Width Modulated Outputs
Features and Benefits
• Dual tracking outputs: analog voltage output and pulse
width modulated (PWM) output
• Matched analog and PWM outputs enable user to detect
various output error conditions
• Factory-programmed offset, sensitivity, and polarity
• Sensitivity temperature coefficient (TC) and QVO/QD
temperature coefficient programmed at Allegrofor
improved accuracy
• High speed chopping scheme minimizes quiescent voltage
output (QVO) drift across temperature
• Temperature-stable QVO and sensitivity
• Output voltage clamps provide short circuit diagnostic
capabilities
• Wide ambient temperature range: –40°C to 150°C
• Immune to mechanical stress
• Enhanced EMC performance for stringent automotive
applications
Package: 8-pin TSSOP (suffix LE)
surface mount
Description
New applications for linear output Hall effect sensors, such
as displacement and angular position, require high accuracy
in conjunction with redundant outputs. The Allegro A1359
programmable, linear, Hall effect sensor IC has been designed
specifically to achieve both goals. The features associated
with this linear device make it ideal for use in automotive
and industrial applications requiring high accuracy, and
this temperature-stable device operates across an extended
temperature range: –40°C to 150°C.
The accuracy of the device is enhanced via programmability
at the Allegro factory for optimization of device sensitivity,
the quiescent voltage output (QVO: output with no magnetic
field), and quiescent duty cycle (QD) for a given application or
circuit. The A1359 also allows optimized performance across
the entire operating temperature range via programming the
temperature coefficients for both sensitivity and QVO/QD at
Allegro end-of-line test. This ratiometric Hall effect sensor IC
provides a analog voltage, and a PWM signal with duty cycle,
that are proportional to the applied magnetic field.
Each BiCMOS monolithic circuit integrates a Hall element,
temperature-compensating circuitry to reduce the intrinsic
sensitivity drift of the Hall element, a small-signal high-gain
Not to scale
Continued on the next page…
VSUPPLY
VCC
CBYPASS
100 nF
Functional Block Diagram
Chopper
Switches
Amp
Signal
Recovery
Signal
Conditioning
Low-Pass
Filter
Sensitivity, QVO, and
Temperature Compensation
PWM
Frequency Trim
PWM Carrier
Generation
Mismatch
Compensation
VOUT
RPULLUP
PWMOUT
GND
A1359-DS, Rev. 1

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A1359
Factory-Programmed Dual Output Linear Hall Effect Sensor IC
With Analog and Pulse Width Modulated Outputs
Description (continued)
amplifier, a clamped low-impedance output stage and a proprietary
dynamic offset cancellation technique.
The A1359 is provided in an 8-contact surface mount TSSOP
(suffix LE) which is lead (Pb) free, with 100% matte tin
leadframe plating.
Selection Guide
Part Number
A1359LLETR-T
Factory Programmed Output Polarity
Forward: Output voltage increases with increasing
positive (south) applied magnetic field
A1359LLETR-RP-T
Reverse: Output voltage increases with increasing
negative (north) applied magnetic field
*Contact Allegro for additional packing options
Packing*
4000 units / reel
4000 units / reel
Absolute Maximum Ratings
Characteristic
Forward Supply Voltage
Reverse Supply Voltage
Forward Output Voltage
Reverse Output Voltage
Forward PWM Output Voltage
Reverse PWM Output Voltage
Output Source Current
Output Sink Current
PWM Output Source Current
PWM Output Sink Current
Operating Ambient Temperature
Storage Temperature
Maximum Junction Temperature
Symbol
VCC
VRCC
VOUT
VROUT
VPWM
VRPWM
IOUT(SOURCE)
IOUT(SINK)
IPWM(SOURCE)
IPWM(SINK)
TA
Tstg
TJ(max)
Notes
Refer to Power Derating section
Refer to Power Derating section
Refer to Power Derating section
VOUT to GND
VCC to VOUT
VPWM > –0.5 V, TA = 25°C
Internal current limiting is intended to protect the
device from momentary short circuits and not
intended for continuous operation
Temperature range L
Rating
6
–0.1
7
–0.1
7
–0.1
2
10
–50
25
–40 to 150
–65 to 170
165
Unit
V
V
V
V
V
V
mA
mA
mA
mA
ºC
ºC
ºC
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2

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A1359
Factory-Programmed Dual Output Linear Hall Effect Sensor IC
With Analog and Pulse Width Modulated Outputs
Pin-out Diagram
PWMOUT 1
VCC 2
NC 3
VOUT 4
8 NC
7 GND
6 NC
5 NC
Terminal List Table
Number
1
Name
PWMOUT Open drain PWM output
Function
2
VCC
Input power supply; tie to GND with bypass capacitor
3 NC No connect, tie to either GND or VCC
4 VOUT Output signal
5 NC No connect, tie to either GND or VCC
6 NC No connect, tie to either GND or VCC
7 GND Device ground
8 NC No connect, tie to either GND or VCC
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Value
Package Thermal Resistance
RθJA On 4-layer PCB based on JEDEC standard
145
*Additional thermal information available on the Allegro website
Unit
ºC/W
Power Dissipation versus Ambient Temperature
1000
900
800
700
600
500
400
300
200
100
0
20 40 60 80 100 120 140 160 180
Temperature, TA (°C)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3