ncv8518 ON Semiconductor, ncv8518 Datasheet - Page 7

• Manufacturer Part Number: ncv8518
• Description: 5v/250ma Ldo With Watchdog, Wake Up, Reset , Delay And Enable
• Manufacturer: ON Semiconductor

V
RESET
Wake Up
WDI
V
RESET High
to Wake Up
Delay Time
IN
OUT
, ENABLE
V
RESET
Wake Up
WDI
V
RESET
Wake Up
WDI
V
V
IN
OUT
IN
OUT
, ENABLE
, ENABLE
Power Up
Figure 3. Error Condition: Watchdog Remains Low and a RESET is Issued
Figure 4. Power Down, Restart Sequence, and Wake Up Response to WDI
POR
POR
POR
edge delay after
Microprocessor
Min WDI falling
Wake Up rising
Figure 2. Power Up, Sleep Mode and Normal Operation
Sleep Mode
edge
Wake Up Period
TIMING DIAGRAMS
http://onsemi.com
Normal Operation with Varying Watchdog Signal
RESET High
to Wake Up
Delay Time
NCV8518
RESET Delay Time
7
RESET Threshold
V
OUT
Power Down
Response to Reset
Decreasing
Wake Up
Wake Up Duty Cycle will be 50% when the WDI
pulse occurs at the low state of the Wake Up Signal.
Duty Cycle = 50%
Wake Up
POR
Wake Up
Period
Response to
Wake Up
WDI