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SRC0CS25D Datasheet(PDF) 26 Page - STMicroelectronics

Part # SRC0CS25D
Description  Power-up duration determined primarily by push-button press
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SRC0CS25D Datasheet(HTML) 26 Page - STMicroelectronics

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DocID026008 Rev 2
Figure 20. Undervoltage detected for <tSRD
1.
VCC goes above VTH+ within tSRD thus power is not disabled after tSRD expires.
2.
tSRD period is set by external capacitor CSRD.
Figure 21. Undervoltage detected for >tSRD
1.
After tSRD expires VCC is still insufficient (below VTH+) thus power is disabled (EN goes low or EN goes
high).
2.
tSRD period is set by external capacitor CSRD.
PB status ignored
V CC
under-
voltage
detection
ignored
VCC-Min
VCC
LO
VCC
(1)
EN
and EN is deasserted
accordingly
PB status
ignored
processor interrupt starts power-down sequence
processor sets PSHOLD low
tSRD(2)
set by CSRD
tDEBOUNCE
tINT_Min
tEN_OFF
INT
VCC undervoltage
detected
V
TH+
V
TH–
PSHOLD
AM00254v1
EN
VCC
LO
VCC-Min
PB status
ignored
VCC is below VTH+ even after tSRD expires
thus power is disabled (EN goes low) and
PB is monitored for regular startup
VCC
under-
voltage
detection
ignored
INT
PS
HOLD
VCC
undervoltage
detected
VTH+
VTH–
VCC
(1)
PB status ignored
t
DEBOUNCE
t
INT_Min
t
EN_OFF
t
SRD
(2)
set by C
SRD
AM00255v1



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