CS8140YDWR24 ON Semiconductor, CS8140YDWR24 Datasheet - Page 11

• Manufacturer Part Number: CS8140YDWR24
• Description: IC REG LDO LIN 500MA 5V 24-SOIC
• Manufacturer: ON Semiconductor

Specifications of CS8140YDWR24

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: 7 ~ 26 V
• Voltage - Dropout (typical): 1.25V @ 500mA
• Number Of Regulators: 1
• Current - Output: 500mA
• Current - Limit (min): 700mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: CS8140YDWR24OS

The designer using this part need only be concerned with
t
regulator with integrated microprocessor control features.
Using the CS8140 or CS8141 as indicated in Figure 21, the
microprocessor can control its own power down sequence.
Hz
WDI(LOWER)
ms
FAIL
ENERGY CONSERVATION AND SMART FEATURES
Energy conservation is another benefit of using a
Figure 20. WDI Signal for C
141
7
Supply and Control Function to the Microprocessor. In this Application, the Microprocessor
Figure 21. Application Diagram for CS8140. The CS8140 Provides a 5.0 V Tightly Regulated
as shown in Figure 20.
110 K
R
13
76
CS8141
1
9.0 V
Switch
C
0.1 mF
Delay
1
Controls its own Power Down Sequence (see text).
= 0.82 mF using
PASS
10 mF
ENABLE
V
CS8140, CS8141
IN
http://onsemi.com
C
2.7 kW
DELAY
CS8140/1
C
0.1 mF
11
2
V
RESET
WATCHDOG PORT
The momentary contact switch quickly charges C1 through
R1.
threshold), the output switches on and V
After a delay period determined by C
programmable reset pulse train is generated at the reset
output. The pulse train continues until the correct watchdog
signal appears at the WDI lead. C1 is now left to discharge
through the input impedance of the enable lead
(approximately 150 kW) and the enable signal disappears.
The output voltage remains at 5.0 V as long as the CS8140
continues to receive the correct watchdog signal.
its watchdog signal. When the microprocessor finishes its
housekeeping or power down software routine, it stops
sending a watchdog signal. In response, the regulator
generates a reset signal and goes into a sleep mode where
V
CC
OUT
When the voltage across C1 reaches 3.95 V ( the enable
The microprocessor can power itself down by terminating
RESET
GND
V
drops to 0 V, shutting down the microprocessor.
WDI
OUT
Microprocessor
Delay
OUT
, a frequency
rises to 5.0 V.