Product Overview
The Allegro A1357 is a high-precision, programmable two-wire Hall-effect linear sensor IC featuring a Pulse Width Modulated (PWM) current output. It converts analog signals from its internal Hall sensor element into a digitally encoded PWM signal, offering superior noise and EMC immunity compared to analog outputs. The device integrates a Hall element, precision temperature-compensating circuitry, a high-gain amplifier, dynamic offset cancellation circuits, and PWM conversion circuitry. Key benefits include reduced wiring costs due to its two-wire output, simultaneous programming of PWM carrier frequency, quiescent duty cycle (QDC), and sensitivity for system optimization, and increased EMC immunity from its fully differential signal path. The A1357 is suitable for applications requiring precise magnetic field sensing with enhanced robustness against environmental factors and electrical noise. However, it is classified as NOT FOR NEW DESIGN and is restricted to existing customer applications.
Product Attributes
- Brand: Allegro MicroSystems
- Product Status: NOT FOR NEW DESIGN (Restricted to existing customer applications)
- Output Type: Pulse Width Modulated (PWM) Current Output
- Package: 3-pin SIP (suffix KB)
- Lead Finish: 100% matte tin
Technical Specifications
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| ABSOLUTE MAXIMUM RATINGS | ||||||
| Forward Supply Voltage | VCC | 28 | V | |||
| Reverse Supply Voltage | VRCC | 18 | V | |||
| Forward Supply Current | ICC | 50 | mA | |||
| Reverse Supply Current | IRCC | 50 | mA | |||
| Operating Ambient Temperature | TA | 40 | 150 | C | ||
| Maximum Junction Temperature | TJ(max) | 165 | C | |||
| Storage Temperature | Tstg | VCC = 0 V | 65 | 170 | C | |
| ELECTRICAL CHARACTERISTICS | ||||||
| Supply Voltage | VCC | 4.5 | 18 | V | ||
| Supply Current | ICC_LOW | 6 | 8 | mA | ||
| Supply Current | ICC_HIGH | 12 | 16.5 | mA | ||
| Supply Zener Clamp Voltage | VZsupply | ICC = 18 mA, TA = 25C | 28 | V | ||
| Internal Bandwidth | BWi | Small signal 3 dB, 100 G(P-P) magnetic input signal, TA = 25C | 400 | Hz | ||
| Chopping Frequency | fC | TA = 25C | 200 | kHz | ||
| OUTPUT CURRENT CHARACTERISTICS | ||||||
| PWMOUT Rise Time | tr | VCC pin, No CBYPASS or RSENSE, TA = 25C | 6.5 | mA/s | ||
| PWMOUT Fall Time | tf | VCC pin, No CBYPASS or RSENSE, TA = 25C | 6.5 | mA/s | ||
| Maximum Propagation Delay | tPROP | TA = 25C | 2 | 3 | ms | |
| Response Time | tRESPONSE | Impulse magnetic field of 300 G, fpwm = 1 kHz, slew rate < 120 G/ms, TA = 25C | 2 | 3.125 | ms | |
| Duty Cycle Jitter | JitterPWM | Measured over 1000 output PWM clock periods, 3 sigma values, Sens = 60 m% / G, TA = 25C | 0.090 | % D | ||
| Clamp Duty Cycle | DCLP(HIGH) | 90 | 95 | % D | ||
| Clamp Duty Cycle | DCLP(LOW) | 5 | 10 | % D | ||
| PRE-PROGRAMMING TARGET | ||||||
| Pre-Programming Quiescent Current Duty Cycle | D(Q)PRE | B = 0 G, TA = 25C | 50 | % D | ||
| Pre-Programming Sensitivity | SensPRE | TA = 25C | 25 | (m% D)/G | ||
| Pre-Programming PWMOUT Carrier Frequency | fPWMPRE | TA = 25C | 1.5 | kHz | ||
| QUIESCENT CURRENT DUTY CYCLE PROGRAMMING | ||||||
| Initial Quiescent Current Duty Cycle | D(Q)init | B = 0 G, TA = 25C | D(Q)PRE | % D | ||
| Guaranteed Quiescent Current Duty Cycle Output Range | D(Q) | B = 0 G, TA = 25C | 40 | 60 | % D | |
| Quiescent Current Duty Cycle Programming Bits | 9 | bit | ||||
| Average Quiescent Current Duty Cycle Step Size | StepD(Q) | TA = 25C | 0.091 | 0.103 | 0.115 | % D |
| Quiescent Current Duty Cycle Programming Resolution | ErrPGD(Q) | TA = 25C | StepD(Q) 0.5 | % D | ||
| SENSITIVITY PROGRAMMING | ||||||
| Initial Sensitivity | Sensinit | TA = 25C | SensPRE | (% D)/G | ||
| Sensitivity Programming Bits Range_ Selection | TA = 25C | 1 | bit | |||
| Sensitivity Programming Bits Fine | TA = 25C | 8 | bit | |||
| Guaranteed Sensitivity Range | SensRange1 | TA = 25C | 35 | 70 | (m% D)/G | |
| Guaranteed Sensitivity Range | SensRange2 | TA = 25C | 70 | 145 | (m% D)/G | |
| Average Sensitivity Step Size | StepSENS1 | TA = 25C | 215 | 300 | 375 | (% D)/G |
| Average Sensitivity Step Size | StepSENS2 | TA = 25C | 430 | 600 | 750 | (% D)/G |
| Sensitivity Programming Resolution | ErrPGSENS | TA = 25C | StepSENS 0.5 | (% D)/G | ||
| CARRIER FREQUENCY PROGRAMMING | ||||||
| Initial Carrier Frequency | fPWMinit | TA = 25C | fPWMPRE | Hz | ||
| Carrier Frequency Programming Range | fPWM | TA = 25C | 0.9 | 1 | 1.1 | kHz |
| Carrier Frequency Programming Bits | 4 | bit | ||||
| Average Carrier Frequency Step Size | StepfPWM | TA = 25C | 38 | 54 | 70 | Hz |
| Carrier Frequency Programming Resolution | ErrPGfPWM | TA = 25C | StepfPWM 0.5 | Hz | ||
| CALIBRATION TEST MODE | ||||||
| Calibration Test Mode Selection Bit | 1 | bit | ||||
| Calibration Test Mode Duration | tCAL | fPWM = 1 kHz | 45 | 50 | 55 | ms |
| Output Duty Cycle During Calibration Mode | DCAL | 49 | 50 | 51 | % D | |
| LOCK BIT PROGRAMMING | ||||||
| Overall Programming Lock Bit | LOCK | 1 | bit | |||
| FACTORY-PROGRAMMED SENSITIVITY TEMPERATURE COEFFICIENT AND DRIFT CHARACTERISTICS | ||||||
| Sensitivity Temperature Coefficient | SensTC_NdFeB | TA = 150C | 0.11 | %/C | ||
| Sensitivity Drift Through Temperature Range | SensTC | TA = 150C | < 3 | % | ||
| Sensitivity Drift Due to Package Hysteresis | SensPKG | TA = 150C, after temperature cycling | < 1 | % | ||
| FACTORY-PROGRAMMED QUIESCENT CURRENT DUTY CYCLE DRIFT | ||||||
| Quiescent Current Duty Cycle Temperature Coefficient | DTC(Q) | TA = 150C | 0 | (% D)/C | ||
| Quiescent Current Duty Cycle Drift Through Temperature Range | D(Q) | Sens = SensPRE, TA = 150C | < 0.35 | % D | ||
| ERROR COMPONENTS | ||||||
| Linearity Sensitivity Error | LinERR | < 1.5 | % | |||
| Symmetry Sensitivity Error | SymERR | < 1.5 | % | |||
| PACKAGE DIMENSIONS (KB, 3-Pin SIP) | ||||||
| Dimension | Min. | Typ. | Max. | Unit | ||
| Width | 5.21 | mm | ||||
| Height | 14.73 | mm | ||||
| Pin Pitch | 2.60 | mm | ||||
2504101957_ALLEGRO-A1357LKB-T_C17469025.pdf
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