ltc693csw-trpbf Linear Technology Corporation, ltc693csw-trpbf Datasheet - Page 8

• Manufacturer Part Number: ltc693csw-trpbf
• Description: Microprocessor Supervisory Circuits
• Manufacturer: Linear Technology Corporation

LTC692/LTC693
WDI: Watchdog Input. WDI is a three level input. Driving
WDI either high or low for longer than the watchdog time-
out period, forces both RESET and WDO low. Floating WDI
disables the watchdog timer. The timer resets itself with
each transition of the watchdog input (see Figure 11).
BLOCK DIAGRAM
PIN FUNCTIONS
8
OSC SEL
OSC IN
V BATT
CE IN
V CC
WDI
PFI
TRANSITION
DETECTOR
GND
1.3V
OSC
–
+
+
–
–
+
C1
C2
C3
M2
RESET PULSE
GENERATOR
WATCHDOG
WDO: Watchdog Logic Output. When the watchdog input
remains either high or low for longer than the watchdog
time-out period, WDO goes low. WDO is set high whenever
there is a transition on the WDI pin, or LOW LINE goes
low. The watchdog timer can be disabled by fl oating WDI
(see Figure 11).
TIMER
CHARGE
PUMP
M1
LTC692/3 • BD
BATT ON
CE OUT
LOW LINE
PFO
RESET
RESET
WDO
V OUT
0692fa