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UH255G-AG6-R Datasheet(PDF) 6 Page - Unisonic Technologies |
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UH255G-AG6-R Datasheet(HTML) 6 Page - Unisonic Technologies |
6 / 6 page UH255 CMOS IC UNISONICTECHNOLOGIESCO.,LTD 6 of 6 www.unisonic.com.tw QW-R118-027.a 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. |
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