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R3115Z101C Datasheet(PDF) 8 Page - RICOH electronics devices division |
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R3115Z101C Datasheet(HTML) 8 Page - RICOH electronics devices division |
8 / 28 page R3115Z 8 OPERATION Current Source Rd Rb Rc Vref Tr.1 Tr.2 CD Nch Pch VDD OUT GND Schmitt Trigger Comparator Ra Fig. 1 Block Diagram with an external capacitor Released Voltage +VDET Detector Threshold −VDET 1 2 3 4 5 Supply Voltage(VDD) Minimum Operating −VDEL GND Output Voltage(OUT) GND A B HYSTERESIS RANGE Delay Time Voltage Operation Status 1 2 3 4 5 Compartor (−) Pin Input Voltage Compartor Output L H Indefinite ON OFF Tr.1,2 OFF ON Indefinite ON OFF Nch OFF ON Indefinite ON OFF Output Tr. Pch ON OFF Indefinite OFF ON × VDD Rb +Rc Ra +Rb+Rc × VDD Rb Ra +Rb Fig. 2 Operation Diagram 1. Output voltage is equal to supply voltage. (As for Nch open drain type, equal to pull-up voltage.) 2. When the supply voltage is down to the detector threshold voltage level(Point A), Vref > = VDD×(Rb+Rc)/(Ra+Rb+Rc) is true, then output of the comparator is reversed from “L” to “H”, therefore output voltage becomes GND level. 3. When the supply voltage is lower than minimum operating voltage, the operation of output transistor is indefinite. In the case of Nch open drain type, output voltage is equal to pull-up voltage. 4. Output Voltage becomes GND level. 5. When the supply voltage is higher than released voltage (Point B), Vref < = VDD×Rb/(Ra+Rb) is true, then output of the comparator reaches the threshold level, and Output of Shmitt Trigger is reversed from “H” to “L”, then output voltage is equal to supply voltage. (As for Nch open drain type, equal to pull-up voltage.) ∗) The difference between released voltage and detector threshold voltage means hysteresis range voltage. |
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