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BD3021HFP-M 데이터시트(PDF) 7 Page - Rohm

부품명 BD3021HFP-M
상세설명  Regulator with Voltage Detector and Watchdog Timer
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
Logo ROHM - Rohm

BD3021HFP-M 데이터시트(HTML) 7 Page - Rohm

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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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