Datasheet

DS1831C/D/E
2 of 15
reset, the 3.3V reset or for all reset outputs by the master pushbutton. The DS1831D replaces one
reference comparator and the master pushbutton with watchdog and the DS1831E replaces the 3.3V
PBRST with a last reset status output.
TOL and TD inputs allow user configuration of the DS1831 for multiple applications. The TOL inputs
configure the tolerance for the specified output and the TD inputs configure the reset time delays.
PIN DESCRIPTION
IN
2.5V
2.5V Power Supply Input
MPBRST
TD
WD
Master Pushbutton (DS1831C/E)
Watchdog Time Delay Select
(DS1831D)
RST
2.5V
2.5V Reset Open Drain
Output
NMI2
WDS
Non-maskable Interrupt 2 (DS1831C/E)
Watchdog Status Output (DS1831D)
TOL
2.5V
Selects 2.5V Input
Tolerance
NMI1 Non-maskable Interrupt 1
TD
2.5V
Selects 2.5V Reset Time
Delay
PBRST
3.3V
PBST
3.3V Reset Pushbutton (DS1831C/E)
Pushbutton Status Output (DS1831E)
PBRST
2.5V
2.5V Reset Pushbutton TD
3.3V
Select 3.3V Reset Time Delay
IN1 Sense Input 1 TOL
3.3V
Selects 3.3V Input Tolerance
IN2
ST
Sense Input 2 (DS1831C/E)
Watchdog Strobe Inputs
(DS1831D)
RST
3.3V
3.3V Reset Open Drain Output
GND Ground IN
3.3V
3.3V Power Supply Input