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CS8101YDWFR20 데이터시트(PDF) 4 Page - Cherry Semiconductor Corporation

부품명 CS8101YDWFR20
상세설명  Micropower 5V, 100mA Low Dropout Linear Regulator with RESET and ENABLE
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제조업체  CHERRY [Cherry Semiconductor Corporation]
홈페이지  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

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Figure 3. RC Network for
Delay
An external RC network on the
lead (Figure 3) pro-
vides a sufficiently long delay for most microprocessor
based applications. RC values can be chosen using the
following formula:
ÐtDelay
RTOTCRST =
[ln
]
where:
RRST =
Delay resistor
RIN
= µP port impedance
RTOT = RRST in parallel with RIN
CRST =
Delay capacitor
tDelay = desired delay time
VRST = VSAT of
lead (0.7V @ turn - ON)
VT
=
threshold
RESET
RESET
RESET
RESET
)
VT Ð VOUT
VRST Ð VOUT
(
RESET
RESET
RESET
CS8101
VOUT
CRST
RRST
COUT
5V to
mP
and
System
Power
to
mP
RESET
Port
The circuit depicted in Figure 4 lets the microprocessor
control its power source, the CS8101 regulator. An I/O
port on the µP and the SWITCH port are used to drive the
base of Q1. When Q1 is driven into saturation, the voltage
on the
lead falls below its lower threshold. The
regulatorÕs output is enabled. When the drive current is
removed, the voltage on the
lead rises, the out-
put is switched off and the IC moves into Sleep mode
where it draws 50µA (max).
By coupling these two controls with the
lead, the
system has added flexibility. Once the system is running,
the state of the SWITCH is irrelevant as long as the I/O
port continues to drive Q1. The microprocessor can turn
off its own power by withdrawing drive current, once the
SWITCH is open. This software control at the I/O port
allows the microprocessor to finish key housekeeping
functions before power is removed.
The logic options are summarized in Table 1.
ENABLE
ENABLE
ENABLE
4
Applications Notes
Circuit Description: continued
0.1
mF
VIN
Gnd
CS8101
VOUT
500k
W
Q1
500k
W
100k
W
100k
W
CRST
RRST
COUT
VCC
I/O Port
mP
SWITCH
VBAT
RESET
ENABLE
RESET
Figure 4. Microprocessor Control of CS8101 using external switching transistor Q1.


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