TC32M_06 Datasheet, PDF (1/12 Pages) Microchip Technology – ECONOMONITOR- 3-Pin System Supervisor with Power Supply Monitor and Watchdog

TC32M
ECONOMONITOR™ – 3-Pin System Supervisor with
Power Supply Monitor and Watchdog
Features:
• Incorporates the Functionality of the Industry
Standard TC1232 (Processor Monitor, Watchdog
and Manual Override Reset Controller) into a
Small, Lower Cost Package
• Guards Against Unstable Processor Operation
Resulting from Power “Brown-Out”
• Automatically Halts and Restarts an Out-of-
Control Microprocessor
• Output can be Wire-ORed, or Hooked to Manual
Reset Push-button Switch
• Space-Saving 3-Pin TO-92 or SOT-223 Package
Applications:
• All Microprocessor-Based Systems
• Battery Powered Computers and Controllers
• Automotive Systems
• Intelligent Instruments
• Critical Processor Monitoring
• Embedded Controllers
Device Selection Table
Part Number Package
TC32MCDB
TC32MCZB
SOT-223
TO-92
TC32MEDB
TC32MEZB
SOT-223
TO-92
Temp. Range
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
Package Type
1 23
TC32MCZB
TC32MEZB
V_DD
4
TC32MCDB
TC32MEDB
1
2
3
GND V_{DD RS}
General Description:
The TC32M is a fully-integrated processor supervisor
in a 3-pin package. It provides three important func-
tions to safeguard processor sanity: precision power
on/off Reset control, Watchdog Timer and external
Reset override.
On power-up, the TC32M holds the processor in the
Reset state for a minimum of 500 msec after V_DD is
within tolerance to ensure a stable system start-up.
Microprocessor sanity is monitored by the on-board
Watchdog circuit. The microprocessor must provide a
high-to-low level shift (through an external resistor
divider) on the RS pin of the TC32M. Should the
processor fail to supply this signal within the specified
time-out period (typically 700 msec), an out-of-control
processor is indicated and the TC32M issues a
processor Reset as a result.
The output of the TC32M can be wire-ORed with a
push-button switch (or electronic signal) to override the
TC32M and unconditionally reset the processor. When
connected to a push-button switch, the TC32M
provides contact debounce.
The TC32M is packaged in a space-saving TO-92 or
SOT-223 package. It provides all of the functionality of
the industry standard TC1232 in a smaller, lower cost
configuration.
© 2006 Microchip Technology Inc.
DS21402C-page 1