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IN1232 Datasheet, PDF (1/6 Pages) Integral Corp. – MICROMONITOR CHIP | |||
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IN1232
MICROMONITOR CHIP
DESCRIPTION
The IN1232 MicroMonitor Chip monitors three vital conditions for a microprocessor: power supply,
software execution, and external override. First, a precision temperatureâcompensated reference and
comparator cir-
cuit monitors the status of VCC. When an outâofâtolerance condition occurs, an internal power fail
signal is generated which forces reset to the active state. When VCC returns to an inâtolerance
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.
The second function the IN1232 performs is pushbutton reset control. The IN1232 debounces the
pushbutton input and guarantees an active reset pulse width of 250 ms minimum. The third function is
a watchdog timer. The IN1232 has an internal timer that forces the reset signals to the active state if
the strobe input is not driven low prior to timeâout. The watchdog timer function can be set to operate
on timeâout settings of approximately 150 ms, 600 ms, and 1.2 seconds.
FEATURES
Halts and restarts an outâofâcontrol
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
Dip-8
PBRST
TD
TOL
GND
RST
RST
ST
VCC
NC
SO-14
PIN DESCRIPTION
Pushbutton Reset Input
Time Delay Set
Selects 5% or 10% VCC Detect
Ground
Reset Output (Active High)
Reset Output (Active Low, open
drain)
Strobe Input
+5 Volt Power
No Connections
1
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