TC32M ECONOMONITOR™ – 3-Pin System Supervisor with Power Supply Monitor and Watchdog Features General Description • 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 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. Applications • • • • • • All Microprocessor-Based Systems Battery Powered Computers and Controllers Automotive Systems Intelligent Instruments Critical Processor Monitoring Embedded Controllers 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. Device Selection Table Part Number TC32MCDB 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. Package Temp. Range SOT-223 0°C to +70°C TC32MCZB TO-92 0°C to +70°C TC32MEDB SOT-223 -40°C to +85°C TC32MEZB TO-92 -40°C to +85°C 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. Package Type 1 2 3 VDD 4 TC32MCDB TC32MEDB 1 2 3 GND VDD RS RS VDD GND TC32MCZB TC32MEZB 2002 Microchip Technology Inc. DS21402B-page 1 TC32M Functional Block Diagram Typical Operating Circuit VDD 5V TC32M VREF1 R1, 10kΩ Watchdog Timer DV Detector Microcontroller R2, 10kΩ PO.1 RS RESET RS TC32M VREF2 RESET Delay Timer GND 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........................... 0°C to +70°C TC32ME Package ........................ -40°C to +85°C Storage Temperature Range ............. -65°C to +150°C TC32M ELECTRICAL SPECIFICATIONS Recommended DC Operating Conditions: TA = -40°C to +85°C unless otherwise noted. Symbol Parameter Min Typ Max Units VDD Supply Voltage 4.5 — 5.5 V VIH RS Input HIGH Level for PB 2.0 — — V VIL RS Input LOW Level for PB — — 0.3 V Test Conditions DC Electrical Characteristics: VDD = 4.5V to 5.5V, TA = -40°C to +85°C unless otherwise noted. Symbol Parameter Min Typ Max Units Test Conditions IIL RS Input Leakage -1 — +1 µA IOL RS Output Current 2.0 10 — mA VOL = 0.4V ICC Operating Current — 50 200 µA Note 1 VSTH RS Strobe HIGH Level (VDD – 0.5V) — — V VSTL RS Strobe LOW Level 2.00 — (VDD – 1.5V) V Figure 3-1 Figure 3-1 VRST RESET Threshold 4.25 — 4.50 V VDD Falling (Note 2, Figure 3-3) Capacitance Electrical Characteristics: TA = 25°C unless otherwise noted. Symbol Parameter Min Typ Max Units CIN Input Capacitance — — 5 pF COUT Output Capacitance — — 7 pF Test Conditions AC Electrical Characteristics: TA = -40°C to +85°C, VDD = 5V ±10%, unless otherwise noted. Symbol Parameter Min Typ Max Units Test Conditions tRST RESET Active Time 500 700 900 msec Figure 3-2 tST RS Strobe Pulse Width 500 — — nsec Figure 3-1 tTD Watchdog Timeout Period 500 700 900 msec Figure 3-1 — — nsec Figure 3-3 VDD Detect to RS LOW tRPD Note 1: 2: No output load. All voltages referenced to ground. 2002 Microchip Technology Inc. DS21402B-page 3 TC32M 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. (SOT-223, TO-92) Symbol 1 GND Ground. Description 2 VDD The +5V power supply input. 3 RS 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. 4 VDD The +5V power supply input (SOT-223 only). DS21402B-page 4 2002 Microchip Technology Inc. TC32M 3.0 DETAILED DESCRIPTION FIGURE 3-1: tST The TC32M provides three important functions to safeguard stable processor operation: precision processor monitor, watchdog sanity timer and external override reset control. VSTL (MAX) 3.1 VSTL (MIN) 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. 2002 Microchip Technology Inc. WATCHDOG STROBE RS VSTH (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). 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 10kΩ, ±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. DS21402B-page 5 TC32M 3.4 FIGURE 3-3: External Override Reset Control 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. FIGURE 3-2: VDD VRST tRPD RS PULLED LOW BY PUSH-BUTTON RESET PB Closed VIH VIL 3.5 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 0.01µF 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. VIH VIL tRST FIGURE 3-4: tRST RS PB Open RS POWER UP/DOWN RESET TIMING TC32M HARDWARE CONNECTIONS (R1, R2 CHOSEN TO MEET VSTH, VSTL) 5V 5V R1, 10kΩ Microcontroller Microprocessor R1, 10kΩ R2, 10kΩ R2,10kΩ PO.1 Decoder RS Address TC32M RS RESET RESET TC32M RESET Microcontroller Example DS21402B-page 6 RESET Microprocessor Example 2002 Microchip Technology Inc. TC32M 4.0 PACKAGING INFORMATION 4.1 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 3-Pin SOT-223 Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 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 Back Tape 2002 Microchip Technology Inc. W Seal Tape DS21402B-page 7 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) .041 (1.04) .033 (0.84) PIN 1 .091 (2.30) TYP. .031 (0.80) .024 (0.60) .071 (1.80) MAX. .013 (0.33) .009 (0.24) 10° MAX. .004 (0.10) .001 (0.02) .181 (4.60) TYP. .036 (0.91) MIN. Dimensions: inches (mm) TO-92-3 .165 (4.19) .125 (3.18) .210 (5.33) .170 (4.32) .500 (12.70) MIN. .205 (5.21) .175 (4.45) .105 (2.67) .080 (2.03) .105 (2.67) .095 (2.41) .018 (0.46) .015 (0.38) .135 (3.43) MIN. .055 (1.40) .045 (1.14) .018 (0.46) .015 (0.38) Dimensions: inches (mm) 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 (0°C to +70°C) E: Extended (-40°C to +85°C) 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. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. 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Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883 United Kingdom Microchip Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 05/01/02 DS21402B-page 12 2002 Microchip Technology Inc.