ECONOMONITOR- 3-Pin System Supervisor with Power Supply Monitor Watchd
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TC32M
ECONOMONITOR- 3-Pin System Supervisor with Power Supply Monitor Watchdog
Incorporates Functionality Industry Standard TC1232 (Processor Monitor, Watchdog Manual Override RESET Controller) into Small, Lower Cost Package Guards Against Unstable Processor Operation Resulting from Power "Brown-Out" Automatically Halts Restarts Out-ofControl Microprocessor Output Wire-ORed, Hooked Manual RESET Push-button Switch Space-Saving 3-Pin TO-92 SOT-223 Package
General Description
TC32M fully-integrated processor supervisor 3-pin package. provides three important functions safeguard processor sanity: precision power on/off RESET control, watchdog timer external RESET override. power-up, TC32M holds processor reset state minimum 500msec after within tolerance ensure stable system start-up. Microprocessor sanity monitored on-board watchdog circuit. microprocessor must provide high-to-low level shift (through external resistor divider) TC32M. Should processor fail supply this signal within specified timeout period (typically 700msec), out-of-control processor indicated TC32M issues processor reset result. output TC32M wire-ORed with push-button switch electronic signal) override TC32M unconditionally reset processor. When connected push-button switch, TC32M provides contact debounce. TC32M packaged space-saving TO-92 SOT-223 package. provides functionality industry standard TC1232 smaller, lower cost configuration.
Applications
Microprocessor-Based Systems Battery Powered Computers 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 +70°C +70°C -40°C +85°C -40°C +85°C
Package Type
TC32MCDB TC32MEDB TC32MCZB TC32MEZB
2002 Microchip Technology Inc.
DS21402B-page
TC32M
Functional Block Diagram
Typical Operating Circuit
TC32M
VREF1
Watchdog Timer Detector
Microcontroller
PO.1
RESET RESET
VREF2 Delay Timer
TC32M
DS21402B-page
2002 Microchip Technology Inc.
TC32M
ELECTRICAL CHARACTERISTICS
*Stresses above those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only functional operation device these other conditions above those indicated operation sections specifications implied. Exposure Absolute Maximum Rating conditions extended periods affect device reliability.
Absolute Maximum Ratings*
Supply Voltage GND) +6.0V Input Voltage Pin. (GND 0.3V) (VDD +0.3V) Operating Temperature Range TC32MC Package. +70°C TC32ME Package -40°C +85°C Storage Temperature Range -65°C +150°C
TC32M ELECTRICAL SPECIFICATIONS
Recommended Operating Conditions: -40°C +85°C unless otherwise noted. Symbol Symbol VSTH VSTL VRST Symbol COUT Symbol tRST tRPD
Note
Parameter Supply Voltage Input HIGH Level Input Level
Units
Test Conditions
Electrical Characteristics: 4.5V 5.5V, -40°C +85°C unless otherwise noted. Parameter Input Leakage Output Current Operating Current Strobe HIGH Level Strobe Level RESET Threshold (VDD 0.5V) 2.00 4.25 (VDD 1.5V) 4.50 Units 0.4V Note Figure Figure Falling (Note Figure 3-3) Test Conditions Test Conditions
Capacitance Electrical Characteristics: 25°C unless otherwise noted. Parameter Input Capacitance Output Capacitance Units
Electrical Characteristics: -40°C +85°C, ±10%, unless otherwise noted. Parameter RESET Active Time Strobe Pulse Width Watchdog Timeout Period Detect
output load. voltages referenced ground.
Units msec nsec msec nsec
Test Conditions Figure Figure Figure Figure
2002 Microchip Technology Inc.
DS21402B-page
TC32M
DESCRIPTIONS
descriptions pins listed Table 2-1.
TABLE 2-1:
(SOT-223, TO-92)
FUNCTION TABLE
Symbol Ground. power supply input. RESET/STROBE (Bidirectional). open drain goes active falls below 4.5V nominal. pulled external electronic signal switch closure. watchdog strobed within minimum watchdog timeout period. During power-up power-down. input mode, connects voltage level shift network (typically resistor divider VDD.) watchdog timer reset when processor causes voltage level VSTL applied power supply input (SOT-223 only). Description
DS21402B-page
2002 Microchip Technology Inc.
TC32M
DETAILED DESCRIPTION
FIGURE 3-1:
VSTH (MIN) VSTL (MAX) VSTL (MIN) Note: maximum elapsed time between strobes which will keep watchdog timer from forcing LOW. STROBE defined high-to-low transition from VSTH VSTL).
WATCHDOG STROBE
TC32M provides three important functions safeguard stable processor operation: precision processor monitor, watchdog sanity timer external override reset control.
Processor Monitor
immediately driven time below nominal threshold voltage. result, this when power initially applied, holding processor reset state. remains minimum 500msec after within tolerance allow power supply processor stabilize.
Watchdog Timer
processor drives with input/output (I/O) line series with resistor voltage divider VDD. Pulling bottom resistor this divider results internal voltage change (strobe) sufficient reset watchdog timer, above input threshold processor RESET pin. processor must continuously apply strobes this manner within period verify proper software execution. momentary reset (500msec minimum) generated TC32M hardware software failure keeps from being strobed within watchdog timeout period. This action typically initiates processor's power-up routine. interruption persists, reset pulses generated each timeout period until strobed. This timeout period typically 700msec.
software routine that drives strobe must section program that executes frequently enough time between toggles less than watchdog timeout period. strobe signal derived from microprocessor address, data and/or control signals. Typical circuit examples shown Figure 3-4.
Resistor Value Selection
values must chosen ensure valid strobe level (VSTL) when processor line low. 10k, tolerance resistors recommended. These values result nominal strobe level (min/max 2.13V/ 3.08V, assuming 5.0V ±10%). Other resistor values used, long additive tolerances power supply resistor values result strobe that falls within VSTH VSTL under additive tolerance conditions.
2002 Microchip Technology Inc.
DS21402B-page
TC32M
External Override Reset Control
FIGURE 3-3:
VRST
built-in debounce circuit allows push-button switch (PB) other electronic signal wire-ORed this external RESET override control. external RESET required active signal. Internally, this input timed provide minimum RESET pulse width 500msec. Reference Figure 3-2.
POWER UP/DOWN RESET TIMING
FIGURE 3-2:
PULLED PUSH-BUTTON RESET
Closed Open
tRPD
tRST
tRST
Supply Monitor Noise Sensitivity
TC32M optimized fast response negativegoing changes VDD. Systems with inordinate amount electrical noise (such systems using relays), require 0.01µF bypass capacitor reduce detection sensitivity. This capacitor should installed close TC32M possible keep capacitor lead length short.
FIGURE 3-4:
TC32M HARDWARE CONNECTIONS (R1, CHOSEN MEET VSTH, VSTL)
R2,10k
Microcontroller
Decoder
Microprocessor
PO.1
TC32M
RESET RESET Microcontroller Example RESET Microprocessor Example
Address
RESET
TC32M
DS21402B-page
2002 Microchip Technology Inc.
TC32M
PACKAGING INFORMATION
Package Marking Information
Package marking data available this time.
Taping Form
Component Taping Orientation 3-Pin SOT-223 Devices
User Direction Feed
Device Marking
Standard Reel Component Orientation Suffix Device (Mark Right Side
Carrier Tape, Number Components Reel Reel Size
Package Carrier Width Pitch Part Full Reel Reel Size
3-Pin SOT-223
4000
Component Taping Orientation 3-Pin TO-92
User Direction Feed
Mark Face
MARK FACE MARK FACE MARK FACE
Seal Tape Back Tape
2002 Microchip Technology Inc.
DS21402B-page
TC32M
Package Dimensions
3-Pin SOT-223
.264 (6.70) .248 (6.30)
.122 (3.10) .114 (2.90)
.287 (7.30) .146 (3.70) .264 (6.70) .130 (3.30)
.091 (2.30) TYP. .031 (0.80) .024 (0.60) .071 (1.80) MAX. .004 (0.10) .001 (0.02) .181 (4.60) TYP.
.041 (1.04) .033 (0.84)
MAX. .036 (0.91) MIN.
.013 (0.33) .009 (0.24)
Dimensions: inches (mm)
TO-92-3
.165 (4.19) .125 (3.18) .210 (5.33) .170 (4.32) .500 (12.70) MIN. .105 (2.67) .080 (2.03) .135 (3.43) MIN.
.205 (5.21) .175 (4.45) .018 (0.46) .015 (0.38)
.105 (2.67) .095 (2.41) .055 (1.40) .045 (1.14)
.018 (0.46) .015 (0.38) Dimensions: inches (mm)
DS21402B-page
2002 Microchip Technology Inc.
TC32M
PRODUCT IDENTIFICATION SYSTEM
order obtain information, e.g., pricing delivery, refer factory listed sales office.
PART CODE
TC32M
Temperature: Commercial (0°C +70°C) Extended (-40°C +85°C) Package Type: 3-Pin TO-92 3-Pin SOT223 DB713: 3-Pin Tape Reel SOT223
Sales Support
Data Sheets Products supported preliminary Data Sheet have errata sheet describing minor operational differences recommended workarounds. determine errata sheet exists particular device, please contact following: Your local Microchip sales office Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision silicon Data Sheet (include Literature using. Customer Notification System Register site (www.microchip.com/cn) receive most current information products.
2002 Microchip Technology Inc.
DS21402B-page9
TC32M
NOTES:
DS21402B-page10
2002 Microchip Technology Inc.
TC32M
Information contained this publication regarding device applications like intended through suggestion only superseded updates. your responsibility ensure that your application meets with your specifications. representation warranty given liability assumed Microchip Technology Incorporated with respect accuracy such information, infringement patents other intellectual property rights arising from such otherwise. Microchip's products critical components life support systems authorized except with express written approval Microchip. licenses conveyed, implicitly otherwise, under intellectual property rights.
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Microchip received QS-9000 quality system certification worldwide headquarters, design wafer fabrication facilities Chandler Tempe, Arizona July 1999 Mountain View, California March 2002. Company's quality system processes procedures QS-9000 compliant PICmicro 8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory analog products. addition, Microchip's quality system design manufacture development systems 9001 certified.
2002 Microchip Technology Inc.
DS21402B-page
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DS21402B-page
2002 Microchip Technology Inc.
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