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BD3021HFP-M 데이터시트(PDF) 7 Page - Rohm |
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BD3021HFP-M 데이터시트(HTML) 7 Page - Rohm |
7 / 15 page Technical Note 7/14 BD3021HFP-M www.rohm.com 2010.11 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. ● BD3021HFP-M (Power on Reset / Watchdog Timer) Power ON reset (output delay time) is adjustable by CT pin capacitor. TdLH(S) ≒(1.15V×CT capacitance(µF) / Ictc(µA) (Typ.) ・ TdLH :Output delay time( power ON reset) ・ 1.15V :Upper switching threshold voltage(Typ.) ・ CT capacitance :capacitor connected to CT pin ・ Ictc :WDT charge current Calculation example) with 0.01µF CT pin capacitor TdLH(S)=1.15V×0.01µF/6µA ≒ 1.9msec ※ If the CT capacitance is not the same as the condition on the electrical characteristics table, i.e., 0.01µF, choose the capacitance value in ratio referring to the above equation. Watch Dog Timer ( WDT watch time, reset time) is adjustable by the CT pin capacitor TWH(S) ≒(1.00V×CT capacitance (µF))/ Ictd(µA) (Typ.) TWL(S) ≒(1.00V×CT capacitance (µF))/ Ictc(µA) (Typ.) ・ TWH :WDT watch time (delay time to turn the reset ON) ・ TWL :WDT reset time (time the reset is ON) ・ 1.00V :Upper switching threshold voltage - lower switching threshold voltage ・ CT capacitance :CT pin capacitor ※Shared with power ON reset ・ Ictc :WDT charge current ・ Ictd :WDT discharge current Calculation example) with 0.01µF CT pin capacitor TWH(S)≒1.00V×0.01µF/2µA≒5.0msec (Typ.) TWL(S)≒1.00V×0.01µF/6µA≒1.7msec (Typ.) ※ If the CT capacitance is not the same as the condition on the electrical characteristics table, i.e., 0.01µF, choose the capacitance value in ratio referring to the above equation. < Timing Chart> Reset ON Power on reset 13.5V 4.0V 4.0V 4.60V CT pull up voltage Reset ON Reset ON Vcc Power on reset 4.50V VHS 100mV 3V 0V 5V 0V 1.25V 1.15V 0.15V 0V 0V 0V OUT voltage VOUT CT CLK RESET |
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