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TC32M
ECONOMONITORTM - 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-ofControl Microprocessor * Output can be Wire-ORed, or Hooked to Manual RESET Push-button Switch * Space-Saving 3-Pin TO-92 or SOT-223 Package
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. On power-up, the TC32M holds the processor in the reset state for a minimum of 500msec after VDD 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.
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 0C to +70C 0C to +70C -40C to +85C -40C to +85C
Package Type
1 23 VDD 4
TC32MCDB TC32MEDB TC32MCZB TC32MEZB
1 GND GND VDD RS 2 VDD 3 RS
2002 Microchip Technology Inc.
DS21402B-page 1
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TC32M
Functional Block Diagram
VDD
Typical Operating Circuit
5V
TC32M
VREF1
R1, 10k
Watchdog Timer DV Detector
Microcontroller
R2, 10k PO.1
RS
RS
RESET RESET
VREF2 Delay Timer GND
TC32M
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DS21402B-page 2
2002 Microchip Technology Inc.
TC32M
1.0 ELECTRICAL CHARACTERISTICS
*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.
Absolute Maximum Ratings*
Supply Voltage (V DD to GND) ............................. +6.0V Input Voltage Any Pin..... (GND - 0.3V) to (VDD +0.3V) Operating Temperature Range TC32MC Package........................... 0C to +70C TC32ME Package ........................ -40C to +85C Storage Temperature Range ............. -65C to +150C
TC32M ELECTRICAL SPECIFICATIONS
Recommended DC Operating Conditions: TA = -40C to +85C unless otherwise noted. Symbol VDD VIH VIL Symbol IIL IOL ICC VSTH VSTL VRST Symbol CIN COUT Symbol tRST tST tTD tRPD
Note 1: 2:
Parameter Supply Voltage RS Input HIGH Level for PB RS Input LOW Level for PB
Min 4.5 2.0 --
Typ -- -- --
Max 5.5 -- 0.3
Units V V V
Test Conditions
DC Electrical Characteristics: VDD = 4.5V to 5.5V, TA = -40C to +85C unless otherwise noted. Parameter RS Input Leakage RS Output Current Operating Current RS Strobe HIGH Level RS Strobe LOW Level RESET Threshold Min -1 2.0 -- (VDD - 0.5V) 2.00 4.25 Typ -- 10 50 -- -- -- Max +1 -- 200 -- (VDD - 1.5V) 4.50 Units A mA A V V V VOL = 0.4V Note 1 Figure 3-1 Figure 3-1 VDD Falling (Note 2, Figure 3-3) Test Conditions Test Conditions
Capacitance Electrical Characteristics: TA = 25C unless otherwise noted. Parameter Input Capacitance Output Capacitance Min -- -- Typ -- -- Max 5 7 Units pF pF
AC Electrical Characteristics: TA = -40C to +85C, VDD = 5V 10%, unless otherwise noted. Parameter RESET Active Time RS Strobe Pulse Width Watchdog Timeout Period VDD Detect to RS LOW
No output load. All voltages referenced to ground.
Min 500 500 500 --
Typ 700 -- 700 --
Max 900 -- 900
Units msec nsec msec nsec
Test Conditions Figure 3-2 Figure 3-1 Figure 3-1 Figure 3-3
2002 Microchip Technology Inc.
DS21402B-page 3
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TC32M
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (SOT-223, TO-92) 1 2 3
PIN FUNCTION TABLE
Symbol GND VDD RS Ground. The +5V power supply input. RESET/STROBE (Bidirectional). The open drain goes active if: 1. VDD falls below 4.5V nominal. 2. If pulled low by an external electronic signal or switch closure. 3. If the watchdog is not strobed within the minimum watchdog timeout period. 4. During power-up and power-down. In the input mode, RS connects to a voltage level shift network (typically a resistor divider to VDD.) The watchdog timer is reset when processor causes a voltage level VSTL to be applied to RS. The +5V power supply input (SOT-223 only). Description
4
VDD
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DS21402B-page 4
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TC32M
3.0 DETAILED DESCRIPTION
FIGURE 3-1:
tST RS VSTH (MIN) VSTL (MAX) VSTL (MIN) tTD Note: tTD is the maximum elapsed time between strobes which will keep the watchdog timer from forcing RS LOW. (A STROBE is defined as a high-to-low transition from VSTH to VSTL).
WATCHDOG STROBE
The TC32M provides three important functions to safeguard stable processor operation: precision processor monitor, watchdog sanity timer and external override reset control.
3.1
Processor Monitor
The RS pin is immediately driven low any time V DD is below the nominal threshold voltage. As a result, this pin is LOW when power is initially applied, holding the processor in its reset state. RS remains low for a minimum of 500msec after VDD is within tolerance to allow the power supply and processor to stabilize.
3.2
Watchdog Timer
The processor drives the RS pin with an input/output (I/O) line in series with an resistor voltage divider to VDD. Pulling the bottom resistor of this divider low results in an internal voltage change (strobe) sufficient to reset the watchdog timer, but above the VIL input threshold of the processor RESET pin. The processor must continuously apply strobes in this manner within a set period to verify proper software execution. A momentary reset (500msec minimum) is generated by the TC32M if a hardware or software failure keeps RS from being strobed within the watchdog timeout period. This action typically initiates the processor's power-up routine. If the interruption persists, new reset pulses are generated each timeout period until RS is strobed. This timeout period is typically 700msec.
The software routine that drives the RS strobe must be in a section of the program that executes frequently enough so the time between toggles is less than one watchdog timeout period. The strobe signal can be derived from microprocessor address, data and/or control signals. Typical circuit examples are shown in Figure 3-4.
3.3
Resistor Value Selection
The values of R1 and R2 must be chosen to ensure a valid low strobe level (VSTL) on RS when the processor I/O line is low. The use of 10k, 5% tolerance resistors are recommended. These values result in a nominal strobe level of 2.5 on RS (min/max of 2.13V/ 3.08V, assuming VDD = 5.0V 10%). Other resistor values can be used, so long as the additive tolerances of the power supply and resistor values result in a strobe that falls within VSTH and VSTL under all additive tolerance conditions.
2002 Microchip Technology Inc.
DS21402B-page 5
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TC32M
3.4 External Override Reset Control
FIGURE 3-3:
VDD VRST
A built-in debounce circuit allows a push-button switch (PB) or other electronic signal to be wire-ORed to this pin as an external RESET override control. The external RESET is required to be an active low signal. Internally, this input is timed to provide a minimum RESET pulse width of 500msec. Reference Figure 3-2.
POWER UP/DOWN RESET TIMING
FIGURE 3-2:
RS PULLED LOW BY PUSH-BUTTON RESET
PB Closed PB Open
tRPD RS VIL
tRST VIH
3.5
RS VIL tRST VIH
Supply Monitor Noise Sensitivity
The TC32M is optimized for fast response to negativegoing changes in VDD. Systems with an inordinate amount of electrical noise on VDD (such as systems using relays), may require a 0.01F bypass capacitor to reduce detection sensitivity. This capacitor should be installed as close to the TC32M as possible to keep the capacitor lead length short.
FIGURE 3-4:
TC32M HARDWARE CONNECTIONS (R1, R2 CHOSEN TO MEET VSTH, VSTL)
5V 5V
R1, 10k R2,10k
Microcontroller
R1, 10k R2, 10k Decoder
Microprocessor
PO.1
RS
TC32M
RS RESET RESET Microcontroller Example RESET Microprocessor Example
Address
RESET
TC32M
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DS21402B-page 6
2002 Microchip Technology Inc.
TC32M
4.0
4.1
PACKAGING INFORMATION
Package Marking Information
Package marking data not available at this time.
4.2
Taping Form
Component Taping Orientation for 3-Pin SOT-223 Devices
User Direction of Feed
Device Marking
W
PIN 1
P Standard Reel Component Orientation for TR Suffix Device (Mark Right Side Up)
Carrier Tape, Number of Components Per Reel and Reel Size
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
3-Pin SOT-223
12 mm
8 mm
4000
13 in
Component Taping Orientation for 3-Pin TO-92
User Direction of Feed
P
Mark Face
MARK FACE MARK FACE MARK FACE
Seal Tape Back Tape
W
2002 Microchip Technology Inc.
DS21402B-page 7
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TC32M
4.3 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)
PIN 1 .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)
10 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)
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DS21402B-page 8
2002 Microchip Technology Inc.
TC32M
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART CODE
TC32M
X
XX
Temperature: C: Commercial (0C to +70C) E: Extended (-40C to +85C) Package Type: ZB: 3-Pin TO-92 DB: 3-Pin SOT223 DB713: 3-Pin Tape & Reel SOT223
Sales and Support
Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2002 Microchip Technology Inc.
DS21402B-page9
TC32M
NOTES:
DS21402B-page10
2002 Microchip Technology Inc.
TC32M
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip's products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights.
Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, MXLAB, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. (c) 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company's quality system processes and procedures are QS-9000 compliant for its PICmicro (R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001 certified.
2002 Microchip Technology Inc.
DS21402B-page 11
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DS21402B-page 12
2002 Microchip Technology Inc.

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