UNISONIC TECHNOLOGIES CO., LTD UH255 CMOS IC SMART MOTOR DRIVER WITH INTEGRATED HALL SENSOR DESCRIPTION The UH255 is a single coil motor driver with integrated Hall sensor.Lock-shutdown and auto-restart function protects the motor from being over-heated and restarts the motor after being locked. The rotation speed function is also integrated in the UH255, the system could detect the rotation speed of motor when using UH255 by the ‘FG’ pin. The UH255 also uses Soft-switch phase-switching technique to reduce the vibration and acoustic noise. PWM is used for the speed control for UH255.Two types of PWM input signals could be used: voltage mode PWM & pulse mode PWM. 6 5 4 1 2 3 SOT-26 FEATURES * Soft switching output driver. * Built-in Hall sensor motor driver. * Motor lock protection and automatic restart. * Thermal shutdown protection. * PWM speed control. ORDERING INFORMATION Ordering Number UH255G-AG6-R Package SOT-26 Packing Tape Reel MARKING www.unisonic.com.tw Copyright © 2016 Unisonic Technologies Co., Ltd 1 of 6 QW-R118-027.a UH255 CMOS IC PIN CONFIGURATIONS PIN DESCRIPTIONS PIN NAME PIN TYPE PIN DESCRIPTION FG O Frequency generation VSS G Ground NO O Driver output SO O Driver output VDD P Power supply PWM I Pulse width modulation speed control Note: I=Input, O=Output, I/O=Input/Output, P=Power Supply, G=Ground. BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R118-027.a UH255 CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT DC Supply Voltage(VDD,FG) VDD 6.5 V Supply Current IDD 3 mA Continous Current ICONT 500 mA Hold Current IHOLD 800 mA PG,RD sink current ISINK 25 mA Magnetic Flux Density B Unlimited Gauss Allowable power dissipation PD 520 mW Junction Temperature TJ 170 °C Operating Temperature TOPR -20 ~ +105 °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. RECOMMENDED OPERATING COMDITIONS PARAMETER Input Voltage Operating Temperature SYMBOL VDD TA MAX 5.5 90 UNIT V °C SYMBOL θJA RATINGS 278 UNIT °C/W ELECTRICAL CHARACTERISTICS (TA =25°C, unless otherwise specified) PARAMETER Average Supply Current(No load) Output Saturation Voltage (FG) Output leakage current (FG) On resistance (Rpmos+Rnmos) Thermal Shutdown Threshold TYP THERMAL DATA PARAMETER Junction to Ambient MIN 1.8 -10 SYMBOL TEST CONDITIONS IDD VSAT IOUT= 10mA ILEAK VOUT=5V RON TSD MIN TYP 1.8 MAX 0.5 1 0.8 165 UNIT mA V uA Ω °C MAGNETIC CHARACTERISTICS PARAMETR Operate Point Release Point Hysteresis SYMBOL BOP BRP BHYS UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP 25 -25 50 MAX UNIT G G G 3 of 6 QW-R118-027.a UH255 CMOS IC HYSTERESIS CHARACTERISTICS TYPICAL APPLICATIONS CIRCUIT Notes: 1.Capacitor C1 is necessary to use for the decoupling between VDD and VSS and should be placed as close to the IC as possible. 2. The PWM pin contains an internal pull-up resistor so the UH255 will rotate at full-speed(100% ON) when this pin is floating. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R118-027.a UH255 CMOS IC OUTPUT WAVEFORMS DESCRIPTION VDD Restart Time Shutdown Time Ton Toff NO&SO The voltage level depends on ‘SO’pin’s level before ‘Lock-shutdown’ FG Notes: 1. FG is open drain,the high level of signal depends on the external supply voltage. 2. The on torque time of motor is equal to the restart time. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R118-027.a UH255 CMOS IC FUNCTIONAL DESCRIPTIONS Refer to the block diagram above, UH255 is composed of the following blocks: 1.Bias generator The bias generator provides bias references for the analog blocks. 2.Oscillator The integrated oscillator provides the clock signal for the digital control logics. 3.Power-on Reset The block of power-on reset is used to detect the power-up ramp and reset the digital circuits. 4.Chopper Amplifier The chopper amplifier structure can achieve a higher magnetic sensitivity and dynamically removes both the offset and flicker noise at the same time. 5.Digital control logics Generates controlling signals for the Hall sensor and Coil driver and a tachometer signal output(FG). 6.PWM speed control Voltage mode PWM: Applying a DC voltage to the PWM pin and the UH255 will generate PWM pulses internally. The rotation speed will be higher if the voltage applied to the PWM pin is higher. The relation of the applying DC voltage and the ‘ON’ duty cycle of PWM pulse is as follows: When the applying DC voltage is from 0.14×VDD to 0.5×VDD, the ‘ON’ duty cycle of PWM pulse is linear with the DC voltage. Otherwise the ‘ON’ duty cycle is zero(DC voltage is lower than 0.14×VDD) and 100%(DC voltage is higher than 0.5×VDD). Pulse mode PWM: User can also apply PWM pulses directly to the PWM pin. The UH255 will pass this pulse to the coil driver with the original duty-cycle ratio. Notes: 1.While using pulse mode PWM, the ‘High’ value of the input pulse should be higher than 0.5×VDD and the ‘Low’ value should be lower than 0.14×VDD. 2. The PWM pulse frequency should be higher than 200Hz, and the recommended frequency range is higher than 30KHz where there PWM input pulses will not generate acoustic noise. 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 6 of 6 QW-R118-027.a