TYPICAL APPLICATIO S
Disabling the Watchdog Timer
ADJUSTABLE
SUPPLY
LTC1726-5/2.5
1
3.3V
VCC3
5V/2.5V
R1*
2
3
VCC5/
VCC25
VCCA
R2*
4
GND
8
RT
7
WT
6
RST
5
WDI
CRT
SYSTEM
RESET
1726 TA03
*TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL
COMBINATION OF R1 AND R2 ≤ 66.5k
THE WATCHDOG TIMER CAN BE DISABLED BY CONNECTING
THE WDI AND WT PINS TO GROUND. THE PART WILL ACT
STRICTLY AS A TRIPLE SUPPLY MONITOR WITH AN
ADJUSTABLE RESET TIME-OUT PERIOD
Triple Supply Monitor (3.3V, 5V and Adjustable)
ADJUSTABLE SUPPLY
OR DC/DC FEEDBACK
DIVIDER
3.3V
5V
R1*
R2*
LTC1726-5
1
VCC3
2
VCC5
3
VCCA
4
GND
8
RT
7
WT
6
RST
5
WDI
CRT
CWT
SYSTEM RESET
WDI
1726 TA04
*TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL
COMBINATION OF R1 AND R2 ≤ 66.5k
LTC1726
Dual Supply Monitor (3.3V and 5V, Defeat VCCA Input)
LTC1726-5
CRT
1
8
3.3V
VCC3
RT
2
7
5V
VCC5
WT
CWT
3
6
VCCA RST
SYSTEM RESET
4
GND
5
WDI
WDI
1726 TA05
9