UNISONIC TECHNOLOGIES CO., LTD UH4921 Preliminary LINEAR INTEGRATED CIRCUIT DYNAMIC DIFFERENTIAL HALL EFFECT SENSOR IC WITH DIGITAL SIGNAL OUTPUT DESCRIPTION The differential Hall Effect sensor UTC UH4921 provides a superior stability and a high sensitivity over temperature and symmetrical thresholds in order to achieve a stable duty cycle. The integrated circuit provides a digital signal output with frequency proportional to the speed of rotation. Unlike other rotational sensors differential Hall ICs are not influenced by radial vibration within the effective airgap of the sensor and require no external signal processing. UTC UH4921 is particularly suitable for rotational speed detection and timing applications of ferromagnetic toothed wheels such as anti-lock braking systems, transmissions, crankshafts, etc. FEATURES * Digital output signal * Low cut-off frequency * High sensitivity * Symmetrical thresholds * Reduced power consumption * AC coupled * Output protection against electrical disturbances * Large temperature range ORDERING INFORMATION Ordering Number UH4921G-G04-K * Large airgap * Protection against overvoltage * Protection against reversed polarity * Two-wire and three-wire configuration possible * Advanced performance * South and north pole pre-induction possible * High piezo resistivity Package SIP-4 Packing Bulk MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 5 QW-R118-025.b UH4921 LINEAR INTEGRATED CIRCUIT PIN DESCRIPTION PIN NO. 1 2 3 4 Preliminary PIN NAME VS Q GND C DESCRIPTION Supply voltage Output Ground Capacitor BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R118-025.b UH4921 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Voltage (Note 1) VS 30 V Output Voltage VQ -0.7 ~ 30 V Output Current IQ 50 mA Output Reverse Current -IQ 50 mA Capacitor Voltage VC -0.3 ~ 3 V Current Through Input-Protection Device t<2ms, v=0.1 ISZ 200 mA Current Through Output-Protection Device t<2ms, v=0.1 IQZ 200 mA Junction Temperature TJ 150 °C Storage Temperature TSTG -40 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL RESISTANCES CHARACTERISTICS PARAMETER SYMBOL θJA Junction to Ambient UNIT K/W OPERATING RANGE PARAMETER SYMBOL VS B0 ∆B Supply Voltage Pre-Induction Differential Induction RATINGS 190 MIN TYP MAX 24 500 80 UNIT V mT mT MIN 3.8 4.3 TYP 11 12 0.25 MAX 15 18 0.6 50 UNIT mA mA V µA -2 0 2 mT 0 mT mT mT µs µs µs µs µs kΩ mV/mT V -500 -80 AC/DC ELECTRICAL CHARACTERISTICS PARAMETER Supply Current (Note 1) Output Saturation Voltage Output Leakage Current Centre of Switching Points: (∆BOP+∆BRP)/2 Operate Point Release Point Hysteresis Output Rise Time Output Fall Time Delay Time SYMBOL IS VQsat IQL ∆Bm ∆BOP ∆BRP ∆BHy tr tf tdop tdrp tdop-tdrp RC SC VC TEST CONDITIONS VQ=high, IQ=0mA VQ=low, IQ=40mA IQ=40mA VQ<=24V -20mT< ∆B<20mT (Note 2, 3)；f=200Hz f=200Hz, ∆B=20mT f=200Hz, ∆B=20mT f=200Hz, ∆B=20mT IQ=40mA, CL=10pF IQ=40mA, CL=10pF f=10kHz, ∆B=5mT 0 1.5 0.5 0.5 25 10 15 62 0 Filter Input Resistance 25°C±2°C 35 55 Filter Sensitivity to ∆B -5 Filter Bias Voltage ∆B=0 1.6 2 2.4 Notes: 1. Reverse current<10mA 2. The Current consumption characteristic will be different and the specified values can slightly change. 3. Leakage currents at pin 4 should be avoided. The bias shift of Bm caused by a leakage current IL can be calculated by: ∆Bm=(IL × RC(T))/SC(T). 4. For higher ∆B the values may exceed the limits like following |∆Bm| < |0.05 × ∆B| UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R118-025.b UH4921 Preliminary LINEAR INTEGRATED CIRCUIT TEST CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 5 QW-R118-025.b UH4921 Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT Two-wire-application Line 4 1 VS Q C 2 VS RL GND 3 CF 470nF VSIGNAL RS Sensor Mainframe for example : RL=330Ω RS=120Ω Three-wire-application RP 4 CF 470nF 1 VS VS RS Q C Line 2 GND 3 VSIGNAL 4.7nF Sensor 4.7nF Mainframe for example : RL=330Ω RP=0~330Ω UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 5 QW-R118-025.b