TC32M Datasheet, PDF (1/12 Pages) TelCom Semiconductor, Inc – 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
TC32MCDB
TC32MCZB
TC32MEDB
TC32MEZB
Package
SOT-223
TO-92
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
V_DD
4
TC32MCZB
TC32MEZB
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 500msec 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
timeout period (typically 700msec), 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.
© 2002 Microchip Technology Inc.
DS21402B-page 1