LTC1726
10
1726fd
For more information www.linear.com/LTC1726
Typical applicaTions
Disabling the Watchdog Timer
Triple Supply Monitor (3.3V, 5V and Adjustable) Dual Supply Monitor (3.3V and 5V, Defeat V
CCA
Input)
1
2
3
4
8
7
6
5
V
CC3
V
CCA
GND
RT
WT
RST
WDI
3.3V
SYSTEM
RESET
*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
C
RT
5V/2.5V
R2*
R1*
1726 TA03
SUPPLY
V
CC5
/V
CC25
1
2
3
4
8
7
6
5
V
CC3
V
CC5
V
CCA
GND
RT
WT
RST
WDI
3.3V
SYSTEM RESET
*TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL
COMBINATION OF R1 AND R2 ≤ 66.5k
C
RT
C
WT
WDI
5V
R2*
R1*
1726 TA04
ADJUSTABLE SUPPLY
OR DC/DC FEEDBACK
DIVIDER
1
2
3
4
8
7
6
5
V
CC3
V
CC5
V
CCA
GND
RT
WT
RST
WDI
3.3V
SYSTEM RESET
WDI
5V
1726 TA05
C
RT
C
WT
Dual Supply Monitor (3.3V or 5V Plus Adjustable)
Dual Supply Monitor (3.3V Plus Adjustable) Using V
CCA
Tied to DC/DC Feedback Divider
1
2
3
4
8
7
6
5
V
CC3
V
CC5
V
CCA
GND
RT
WT
RST
WDI
LTC1726-5
R2*
1726 TA06
R1*
SUPPLY
5V
10k
SYSTEM RESET
*TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL
COMBINATION OF R1 AND R2 ≤ 66.5k
C
RT
C
WT
WDI
REFER TO LTC1726-X OVERRIDE FUNCTIONS IN
THE APPLICATIONS INFORMATION SECTION
1
2
3
4
8
7
6
5
V
CC3
V
CC25
V
CCA
GND
RT
WT
RST
WDI
LTC1726-2.5
SYSTEM RESET
WDI
R2*
1726 TA07
R1*
ADJUSTABLE
SUPPLY
10k
*TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL
COMBINATION OF R1 AND R2 ≤ 66.5k
C
RT
C
WT
1
2
3
4
8
7
6
5
V
CC3
V
CC5
V
CCA
GND
RT
WT
RST
WDI
LTC1726-5
3.3V
SYSTEM RESET
WDI
5V
22.1k
1%
1726 TA08
35.7k
1%
LTC1435
ADJUSTABLE
RESET TRIP
THRESHOLD 2.74V
2.8k
1%
6
V
OSENSE
C
RT
C
WT
