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HT7022A-2 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT7022A-2 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 17 page  HT70xxA-2 Rev. 1.20 6 December 14, 2012 Functional Description The HT70xxA-2 series is a set of voltage detectors equipped with a high stability voltage reference which is connected to the negative input of a comparator ¾ denoted as VREF in the following figure for NMOS output voltage detector. When the voltage drop to the positive input of the comparator (i,e,VB) is higher than VREF, VOUT goes high, M1 turns off, and VB is expressed as VBH=VDD ´ (RB+RC)/(RA+RB+RC). If VDD is decreased so that VB falls to a value less than VREF, the comparator output inverts from high to low, VOUT goes low, VC is high, M1 turns on, RC is bypassed, and VB becomes: VBL=VDD ´ RB /(RA+RB), which is less than VBH. By so doing, the comparator output will stay low to prevent the circuit from oscillating when VB » VREF. If VDD falls below the minimum operating voltage, the output becomes undefined. When VDD goes from low to VDD ´ RB /(RA+RB)>VREF, the comparator output and VOUT goes high. The detectable voltage is defined as: VDET ( -)= R+ R + R R+ R AB C BC ´ VREF The release voltage is defined as: VDET (+) = R+ R R AB B ´ VREF The hysteresis width is: VHYS =VDET (+) - VDET (-) The figure demonstrates the NMOS output type with positive output polarity (VOUT is normally open, active low). The HT70xxA-2 series also supplies options for other output types with active high outputs. Application circuits shown are examples of positive output polarity (normally open, active low) unless otherwise specified. V S S V D D R A R B R C M 1 M N C o m p a r a t o r V O U T R L V R E F V B V C NMOS Output Voltage Detector |
Similar Part No. - HT7022A-2 |
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Similar Description - HT7022A-2 |
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