DS1831C Datasheet, PDF (1/14 Pages) Dallas Semiconductor – 3.3V/2.5V Multi-Supply MicroMonitor

DS1831C/D/E
3.3V/2.5V Multi-Supply MicroMonitor
www.dalsemi.com
FEATURES
2.5V power-on reset
3.3 (or 3V) power-on reset
2 referenced comparators with separate
outputs for monitoring additional supplies
Internal power is drawn from higher of either
the IN_2.5V input or the IN_3.3V input
Excellent for systems designed to operate
with multiple power supplies
Asserts resets during power transients
Pushbutton reset input for system override
Maintains reset for user configurable times
of 10 ms, 100 ms, or 1 sec
Watchdog timer for software monitoring
(DS1831D)
Precision temperature-compensated voltage
reference and voltage sensor
16 pin DIP & 16 pin 150 mil SOIC available
Operating Temperature of -40°C to +85°C
PIN ASSIGNMENT
DS1831C
IN_2.5V
1
RST_2.5V 2
TOL_2.5V 3
TD_2.5V
4
PBRST_2.5V 5
IN1 6
16 IN_3.3V
15 RST_3.3V
14
TOL_3.3V
13 TD_3.3V
12 PBRST_3.3V
11 NMI1
IN2 7
10 NMI2
GND 8
9 MPBRST
16-Pin (300 mil) DIP
&
16-Pin (150 mil) SOIC
DS1831D
IN1 ₆
11 NMI1
ST
7
10 WDS
GND ₈
9
TD_WD
DS1831E
TD_2.5V
4
PBRST_2.5V
5
IN1 ₆
13
TD_3.3V
12 PBST
11 NMI1
DESCRIPTION
The DS1831C Multi-Supply Monitor & Reset monitors up to 4 system voltages: 2.5 volt supply, 3.3 (or
3) volt supply, and 2 additional user configurable voltage monitors. DS1831 power for internal operation
comes from the higher voltage level of the 3.3 volt input or the 2.5 volt input. One of these inputs must
be greater than 1 volt for device operation. Pushbutton (manual reset) functionality is provided for the
2.5 volt reset, the 3.3 volt 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
3.3-volt 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.
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