DS1232 Datasheet, PDF (1/7 Pages) Dallas Semiconductor – MicroMonitor Chip

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DS1232
MicroMonitor Chip
FEATURES
Halts and restarts an out-of-control
microprocessor
Holds microprocessor in check during power
transients
Automatically restarts microprocessor after
power failure
Monitors pushbutton for external override
Accurate 5% or 10% microprocessor power
supply monitoring
Eliminates the need for discrete components
Space-saving, 8-pin mini-DIP
Optional 16-pin SOIC surface mount package
Industrial temperature -40°C to +85°C
available, designated N
PIN ASSIGNMENT
PBRST 1
8 VCC
TD 2
TOL 3
GND 4
7 ^ST
6 RST
5 RST
DS1232 8-Pin DIP (300-mil)
See Mech. Drawings Section
NC
PBRST
NC
TD
NC
TOL
NC
GND
1 16
2 15
3 14
4 13
5 12
6 11
7 10
8
9
NC
VCC
NC
ST
NC
RST
NC
RST
DS1232S 16-Pin SOIC (300-mil)
See Mech. Drawings Section
PIN DESCRIPTION
PBRST
TD
TOL
GND
RST
- Pushbutton Reset Input
- Time Delay Set
- Selects 5% or 10% V_CC Detect
- Ground
- Reset Output (Active High)
RST
- Reset Output (Active Low, open
drain)
ST
- Strobe Input
V_CC
- +5 Volt Power
NC
- No Connections
DESCRIPTION
The DS1232 MicroMonitor Chip monitors three vital conditions for a microprocessor: power supply,
software execution, and external override. First, a precision temperature-compensated reference and
comparator circuit monitors the status of V_CC. When an out-of-tolerance condition occurs, an internal
power fail signal is generated which forces reset to the active state. When V_CC returns to an in-tolerance
condition, the reset signals are kept in the active state for a minimum of 250 ms to allow the power supply
and processor to stabilize.
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