TC32M Datasheet, PDF (1/4 Pages) TelCom Semiconductor, Inc – ECONOMONITOR - 3-PIN SYSTEM SUPERVISOR WITH POWER SUPPLY MONITOR AND WATCHDOG

1
TC32M
ECONOMONITOR™ – 3-PIN SYSTEM SUPERVISOR WITH POWER
SUPPLY MONITOR AND WATCHDOG
2
FEATURES
s Incorporates the Functionality of the Industry
Standard TC1232 (Processor Monitor, Watchdog
and Manual Override RESET Controller) into a
Small, Lower Cost Package
s Guards Against Unstable Processor Operation
Resulting from Power "Brown-Out"
s Automatically Halts and Restarts an Out-of-
Control Microprocessor
s Output can be Wire-ORed, or Hooked to Manual
RESET Push-button Switch
s Space-Saving 3-Pin TO-92 or SOT-223 Package
APPLICATIONS
s All Microprocessor-Based Systems
s Battery Powered Computers and Controllers
s Automotive Systems
s Intelligent Instruments
s Critical Processor Monitoring
s Embedded Controllers
PIN CONFIGURATIONS
TO-92
1 23
SOT-223
VDD
4
TC32MCZB
TC32MEZB
TC32MCDB
TC32MEDB
1
2
3
GND VDD _RS
GENERAL DESCRIPTION
The TC32M is a fully-integrated processor supervisor in
a 3-pin package. It provides three important functions to
safeguard processor sanity: precision power on/off RESET
control, watchdog timer and external RESET override.
3 ^{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. Microproces-
sor 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-
4 ^{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 configu-
ration.
5
ORDERING INFORMATION
Part No.
Package
Temperature
Range
TC32MCDB
TC32MCZB
TC32MEDB
TC32MEZB
SOT-223
TO-92
SOT-223
TO-92
0°C to +70°C
0°C to +70°C
– 40°C to +85°C
– 40°C to +85°C
6
FUNCTIONAL BLOCK DIAGRAM
V_DD
TYPICAL OPERATING CIRCUIT
5V
WATCHDOG
TIMER
V_REF1
∆V
DETECTOR
TC32M
V_REF2
DELAY
TIMER
RS
GND
TELCOM SEMICONDUCTOR, INC.
R1, 10k
MICRO-
CONTROLLER
7
R2,10k
PO.1
RS
TC32M
RESET
RESET
MICROCONTROLLER EXAMPLE
TC32M-2 9/26/96
5-3
8