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CS8101 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. CS8101
Description  Micropower 5.0 V, 100 mA Low Dropout Linear Regulator with RESET and ENABLE
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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CS8101 Datasheet(HTML) 6 Page - ON Semiconductor

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CS8101
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6
The RESET output is an open collector NPN transistor,
controlled by a low voltage detection circuit. The circuit is
functionally independent of the rest of the IC thereby
guaranteeing that the RESET signal is valid for VOUT as low
as 1.0 V.
Figure 5. RC Network for RESET Delay
VOUT
CS8101
5.0 V to
mP
and System
Power
RESET
RRST
to
mP
RESET
Port
CRST
COUT
An external RC network on the lead (Figure 5) provides
a sufficiently long delay for most microprocessor based
applications. RC values can be chosen using the following
formula:
RTOTCRST +
−tDelay
ln
VT*VOUT
VRST*VOUT
where:
RRST = RESET Delay resistor
RIN = mP port impedance
RTOT = RRST in parallel with RIN
CRST = RESET Delay capacitor
tDelay = desired delay time
VRST = VSAT of RESET lead (0.7 V @ turn − ON)
VT = RESET threshold.
The circuit depicted in Figure 6 lets the microprocessor
control its power source, the CS8101 regulator. An I/O port
on the
mP and the SWITCH port are used to drive the base
of Q1. When Q1 is driven into saturation, the voltage on the
ENABLE lead falls below its lower threshold. The
regulator’s output is enabled. When the drive current is
removed, the voltage on the ENABLE lead rises, the output
is switched off and the IC moves into Sleep mode where it
draws 50
mA (max).
By coupling these two controls with the ENABLE 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.
Table 1. Logic Control of CS8101 Output
Microprocessor
I/O Drive
Switch
ENABLE
Output
ON
Closed
LOW
ON
Open
LOW
ON
OFF
Closed
LOW
ON
Open
HIGH
OFF
The I/O port of the microprocessor typically provides
50
mA to Q1. In automotive applications the SWITCH is
connected to the ignition switch.


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