A1359_16 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – Factory-Programmed Dual Output Linear Hall Effect Sensor IC With Analog and Pulse Width Modulated Outputs

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 Allegro^™ for
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…
V_SUPPLY
VCC
C_BYPASS
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
R_PULLUP
PWMOUT
GND
A1359-DS, Rev. 1