A1351LKTTN-T

A1351LKTTN-T Datasheet

A1351 High Precision Linear Hall Effect Sensor IC with a Push/Pull, Pulse Width Modulated Output

Part	Datasheet
A1351LKTTN-T	A1351LKTTN-T (pdf)

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A1351KKTTN-T	A1351KKTTN-T

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A1351 High Precision Linear Hall Effect Sensor IC with a Push/Pull, Pulse Width Modulated Output Last Time Buy This part is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change October 31, 2011 Deadline for receipt of LAST TIME BUY orders April 27, 2012 Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales. NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. A1351 High Precision Linear Hall Effect Sensor IC with a Push/Pull, Pulse Width Modulated Output •Pulse width modulated PWM output provides increased noise immunity compared to an analog output •1 mm case thickness provides greater coupling for current sensing applications •Push/pull output •Customer-programmable offset and sensitivity •Factory-programmed 0%/°C Sensitivity Temperature Coefficient •Programmability at end-of-line •Selectable unipolar or bipolar quiescent duty cycles •Selectable sensitivity range between and D/G •Temperature-stable quiescent duty cycle output and sensitivity •Precise recoverability after temperature cycling •Output duty cycle clamps provide short circuit diagnostic capabilities •Optional 50% D calibration test mode at device power-up •Wide ambient temperature range to 125°C •Resistant to mechanical stress Package 4 pin SIP suffix KT 1 mm case thickness TheA1351 device is a high precision, programmable linear Hall effect sensor IC with a pulse width modulated PWM output. The duty cycle, D, of the PWM output signal is proportional to an applied magnetic field. The A1351 device converts an analog signal from its internal Hall element to a digitally encoded PWM output signal. The coupled noise immunity of the digitally encoded PWM output is far superior to the noise immunity of an analog output signal. A simple RC network can be used to convert the digital PWM signal back to analog signal. The BiCMOS, monolithic circuit inside of theA1351 integrates a Hall element, precision temperature-compensating circuitry to reduce the intrinsic sensitivity and offset drift of the Hall element, a small-signal high-gain amplifier, proprietary dynamic offset cancellation circuits, and PWM conversion circuitry. The dynamic offset cancellation circuits reduce the residual offset voltage of the Hall element. Hall element offset is normally caused by device over molding, temperature dependencies, and thermal stress. The high frequency offset cancellation chopping clock allows for a greater sampling rate, which increases the accuracy of the output signal and results in faster signal processing capability. Not to scale Continued on the next V+ VCC CBYPASS Functional Block Diagram Regulator VREG PWM Frequency Trim PWM Carrier Generation Chopper Switches Signal Recovery Signal Conditioning Sensitivity Temperature % Duty Trim Compensation Cycle % Duty Cycle Temperature Coefficient PWM Modulation Logic with Push-Pull Output PWMOUT/ Programming A1351 High Precision Linear Hall Effect Sensor IC with a Push/Pull, Pulse Width Modulated Output Description continued An internal filter of approximately 150 Hz is used to achieve 11 bits of output resolution. Key applications for the A1351 include battery current sensing, exhaust gas return EGR , throttle position, ride height and seat belt tensioning systems. The A1351 is provided in an extremely thin case 1 mm thick , 4-pin SIP single in-line package, suffix KT that is lead Pb free, with 100% matte tin leadframe plating.

PDF Datasheet Preview

A1351 High Precision Linear Hall Effect Sensor IC with a Push/Pull, Pulse Width Modulated Output

Last Time Buy

This part is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available.

Date of status change October 31, 2011 Deadline for receipt of LAST TIME BUY orders April 27, 2012

Recommended Substitutions:

For existing customer transition, and for new customers or new applications, contact Allegro Sales.

NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative.

A1351

High Precision Linear Hall Effect Sensor IC with a Push/Pull, Pulse Width Modulated Output
•Pulse width modulated PWM output provides increased noise immunity compared to an analog output
•1 mm case thickness provides greater coupling for current sensing applications
•Push/pull output
•Customer-programmable offset and sensitivity
•Factory-programmed 0%/°C Sensitivity Temperature Coefficient
•Programmability at end-of-line
•Selectable unipolar or bipolar quiescent duty cycles
•Selectable sensitivity range between and D/G
•Temperature-stable quiescent duty cycle output and sensitivity
•Precise recoverability after temperature cycling
•Output duty cycle clamps provide short circuit diagnostic
capabilities
•Optional 50% D calibration test mode at device power-up
•Wide ambient temperature range to 125°C
•Resistant to mechanical stress

Package 4 pin SIP suffix KT
1 mm case thickness

TheA1351 device is a high precision, programmable linear Hall effect sensor IC with a pulse width modulated PWM output. The duty cycle, D, of the PWM output signal is proportional to an applied magnetic field. The A1351 device converts an analog signal from its internal Hall element to a digitally encoded PWM output signal. The coupled noise immunity of the digitally encoded PWM output is far superior to the noise immunity of an analog output signal. A simple RC network can be used to convert the digital PWM signal back to analog signal.

The BiCMOS, monolithic circuit inside of theA1351 integrates a Hall element, precision temperature-compensating circuitry to reduce the intrinsic sensitivity and offset drift of the Hall element, a small-signal high-gain amplifier, proprietary dynamic offset cancellation circuits, and PWM conversion circuitry. The dynamic offset cancellation circuits reduce the residual offset voltage of the Hall element. Hall element offset is normally caused by device over molding, temperature dependencies, and thermal stress. The high frequency offset cancellation chopping clock allows for a greater sampling rate, which increases the accuracy of the output signal and results in faster signal processing capability.

Not to scale

Continued on the next

V+ VCC

CBYPASS

Functional Block Diagram

Regulator

VREG

PWM Frequency Trim

PWM Carrier Generation

Chopper Switches

Signal Recovery

Signal Conditioning

Sensitivity Temperature % Duty

Trim

Compensation Cycle
% Duty Cycle Temperature Coefficient

PWM Modulation Logic with Push-Pull

Output

PWMOUT/ Programming

A1351

High Precision Linear Hall Effect Sensor IC with a Push/Pull, Pulse Width Modulated Output

Description continued An internal filter of approximately 150 Hz is used to achieve 11 bits of output resolution.

Key applications for the A1351 include battery current sensing, exhaust gas return EGR , throttle position, ride height and seat belt tensioning systems.

The A1351 is provided in an extremely thin case 1 mm thick , 4-pin SIP single in-line package, suffix KT that is lead Pb free, with 100% matte tin leadframe plating.

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Datasheet ID: A1351LKTTN-T 516006