High Precision Linear Hall-Effect Sensor IC with Open Drain Pulse Width Modulated Output A1356
Product Overview
The Allegro A1356 is a high-precision, programmable Hall-effect linear sensor IC featuring an open-drain Pulse Width Modulated (PWM) output. This device converts an applied magnetic field into a digitally encoded PWM signal, offering superior noise immunity compared to analog outputs. Its integrated BiCMOS monolithic circuit includes a Hall element, precision temperature-compensating circuitry, a high-gain amplifier, dynamic offset cancellation, and PWM conversion. Key benefits include simultaneous programming of PWM carrier frequency, quiescent duty cycle, and sensitivity for system optimization, factory-programmed temperature coefficient and drift, and end-of-line programmability. The PWM output provides increased noise immunity and precise recoverability after temperature cycling, with output duty cycle clamps for short-circuit diagnostics. It operates over a wide ambient temperature range of 40C to 150C and a wide power supply range of 4.5 to 18 V.
Product Attributes
- Brand: Allegro MicroSystems
- Package Type: 3-pin SIP (suffix KB)
- Lead Finish: 100% matte tin
- Material: BiCMOS, monolithic circuit
- Output Type: Open Drain Pulse Width Modulated (PWM)
Technical Specifications
| Characteristic | Symbol | Min. | Typ. | Max. | Unit | Notes |
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 4.5 | 18 | V | Operating range | |
| Supply Current | ICC | 6 | 10 | mA | ||
| Operating Ambient Temperature | TA | 40 | 150 | C | ||
| PWM Output Saturation Voltage | VSAT | 0.6 | V | IOUTSINK 20 mA, PWMOUT transistor on | ||
| PWM Output Leakage Current | ILEAK | 0.1 | 10 | A | VCC = 3.2 V, 0 V PWMOUT 24 V, PWMOUT transistor off | |
| PWM Rise Time | tr | 3 | s | R = 2 k, C = 20 pF, Guaranteed by design | ||
| PWM Fall Time | tf | 3 | s | R = 2 k, C = 20 pF, Guaranteed by design | ||
| Clamp Duty Cycle (High) | DCLP(HIGH) | 90 | 95 | % D | ||
| Clamp Duty Cycle (Low) | DCLP(LOW) | 5 | 10 | % D | ||
| Guaranteed Quiescent Duty Cycle Output Range | D(Q) | 40 | 60 | % D | TA = 25C | |
| Guaranteed Sensitivity Range | SensLOW | 45 | 75 | (m% D)/G | TA = 25C | |
| Carrier Frequency Programming Range | fPWM | 1.8 | 2 | 2.2 | kHz | TA = 25C |
| Sensitivity Temperature Coefficient | SensTC | 0.03 | %/C | Programmed at 150C, calculated relative to 25C | ||
| Sensitivity Drift Through Temperature Range | SensTC | < 3 | % | TA = 150C | ||
| Linearity Sensitivity Error | LinERR | 3.0 | % | |||
| Symmetry Sensitivity Error | SymERR | 1.5 | % | Valid for bipolar devices | ||
| Part Number | A1356LKB-T | 500 pieces per bag |
Product Status
Discontinued Product. This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available.
Package Information
Package: 3-pin SIP (suffix KB)
Dimensions: Refer to Package Outline Drawing for detailed dimensions.
Programming
Programming is accomplished via the VCC pin using a series of input voltage pulses (VP(LOW), VP(MID), VP(HIGH)). Features include Try mode, Blow mode, and Lock mode for parameter setting and permanent configuration. Key programmable parameters include Sensitivity, Quiescent Duty Cycle Output, and PWM Carrier Frequency. A 0.1 F blowing capacitor (CBLOW) is required during programming.
Output Calibration Test Mode
The Output Calibration Test Mode provides a fixed 50% duty cycle for 50 ms upon power-up, regardless of the applied magnetic field. This mode aids in compensating for potential threshold errors caused by differences in ground potentials between the sensor and interface circuitry. It must be enabled by blowing a specific programming bit.
2401241356_ALLEGRO-A1356LKB-T_C3716249.pdf
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