TC1232 Microprocessor Monitor Features: General Description: • Precision Voltage Monitor: - Adjustable +4.5V or +4.75V • Reset Pulse Width – 250 ms minimum • No External Components • Adjustable Watchdog Timer: - 150 ms, 600 ms or 1.2s • Operating Voltage 4.0V to 5.5V • Debounced Manual Reset Input for External Override The TC1232 is a fully-integrated processor supervisor that provides three important functions to safeguard processor sanity: precision power on/off Reset control, Watchdog Timer and external Reset override. On power-up, the TC1232 holds the processor in the Reset state for a minimum of 250 ms after VCC 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 periodic low-going signal on the ST input. Should the processor fail to supply this signal within the selected time-out period (150 ms, 600 ms or 1200 ms), an outof-control processor is indicated and the TC1232 issues a processor Reset as a result. Block Diagram VCC RST Tolerance Select (5% or 10%) TOL + – + + VREF – PB RST Debounce TD Watchdog Timebase Select The outputs of the TC1232 are immediately driven active when the PB input is brought low by an external push button switch or other electronic signal. When connected to a push button switch, the TC1232 provides contact debounce. RST The TC1232 is packaged in a space-saving 8-Pin PDIP or SOIC package, a 16-Pin SOIC (wide) package and requires no external components. Reset Generator Watchdog Timer ST Package Types 8-Pin PDIP 8 VCC PB RST 1 TD 2 TOL 3 8-Pin SOIC TC1232 PB RST 1 8 VCC TD 2 7 ST TOL 3 6 RST GND 4 5 RST 7 ST 6 RST 5 GND 4 16-Pin SOIC (Wide) RST TC1232 TC1232 NC PB RST NC TD NC TOL NC GND 1 2 3 4 5 6 7 8 TC1232 16 15 14 13 12 11 10 9 NC VCC NC ST NC RST NC RST Device Features RST pin Device Type TC1232 Open-drain RST pin Pull-up Active Resistor Level External 2002-2014 Microchip Technology Inc. Low Type Push-pull Minimum WDI Input Trip Points Reset MR Typical Active (Max) Active Time Input Timeouts (ms) Level (ms) High 4.75V or 4.5V 250 150, 600 or 1200 Yes DS20001370E-page 1 TC1232 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† Voltage on Any Pin (With Respect to GND) ...................................................... -0.3V to +5.8V Operating Temperature Range: C-Version ........................................ 0°C to +70°C E-Version......................................-40°C to +85°C Storage Temperature Range: ............-65°C to +150°C DC CHARACTERISTICS Electrical Specifications: Unless otherwise noted, TA = TMIN to TMAX; VCC = +4.0V to 5.5V. Parameters Sym. Min. Typ. Max. Units Supply Voltage VCC 4.0 5.0 5.5 V ST and PB RST Input High Level VIH 2.0 — VCC +0.3 V ST and PB RST Input Low Level VIL -0.3 — +0.8 V IL -1.0 — +1.0 µA Output Current RST IOH -1.0 -12 — mA VOH = 2.4V Current RST, RST IOL 2.0 10 — mA VOL = 0.4V Operating Current ICC — 50 200 µA Note 2 VCC 5% Trip Point VCCTP 4.50 4.62 4.74 V TOL = GND (Note 3) VCC 10% Trip Point VCCTP 4.25 4.37 4.49 V TOL = VCC (Note 3) Input Leakage ST, TOL Conditions Note 1 Capacitance Electrical Characteristics: Unless otherwise noted, TA = +25°C. (Note 4) Input Capacitance ST, TOL Output Capacitance RST, RST Note 1: 2: 3: 4: CIN — — 5 pF COUT — — 7 pF PB RST is internally pulled up to VCC with an internal impedance of typically 40 k. Measured with outputs open. All voltages referenced to GND. Ensured by design. DS20001370E-page 2 2002-2014 Microchip Technology Inc. TC1232 tF VCC tR +4.75V +4.75V +4.25V +4.25V VCC VCC = 5V 4.6V (5% Trip Point) +4.5V (5% Trip Point) 4.5V(10% Trip Point) +4.25V (10% Trip Point) VCC tRPU tRPD RST RST RST Determined by external Pull-up resistor FIGURE 1-1: VOH VOH VOL VOL RST Determined by external Pull-up resistor Rise Time, Fall Time and Reset Detected to Reset Active Timing Waveforms. AC CHARACTERISTICS Electrical Specifications: Unless otherwise noted, TA = TMIN to TMAX; VCC = +4.0V to 5.5V. Parameters VCC Fall Time VCC Rise Time Sym. Min. Typ. Max. Units tF 10 — — µs Conditions Note 1 tR 0 — — µs Note 1 VCC Trip Point Detected to RST High and RST Low tRPD — — 100 ns VCC falling VCC Trip Point Detected to RST High and RST Open tRPU 250 610 1000 ms VCC rising (Note 2) Note 1: 2: Ensured by design. tR = 5 µs. 2002-2014 Microchip Technology Inc. DS20001370E-page 3 TC1232 tPB ST tTD tST tPBD PB RST VIH VIL RST (when tTD tTD (min)) tRST “H” RST (when tTD(min) tTD tTD(max)) RST RST RST (when tTD tTD(max)) The debounced PB RST input ignores input pulses less than 1 ms and is designed to recognize pulses of 20 ms or greater. RST (when tTD tTD(min)) “L” RST (when tTD(min) tTD tTD(max)) RST (when tTD tTD(max)) FIGURE 1-2: Push Button Reset and Watchdog Timer Reset Timing Waveforms. AC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise noted, TA = TMIN to TMAX; VCC = +4.0V to 5.5V. Parameters Sym. Min. Typ. Max. Units PB RST Pulse Width tPB 20 — — ms PB RST Falling Edge Low to Reset Active tPBD 1 4 20 ms PB RST Rising Edge High to Reset Inactive tRST 250 610 1000 ms ST Pulse Width tST 20 — — ns ST Time-out Period tTD 62.5 150 250 ms TD Pin = 0V 250 600 1000 ms TD Pin = Open 500 1200 2000 ms TD Pin = VCC Note 1: Conditions Note 1 PB RST must be held low for a minimum of 20 ms to ensure a Reset. DS20001370E-page 4 2002-2014 Microchip Technology Inc. TC1232 2.0 TYPICAL PERFORMANCE CURVES Performance Graphs are not available. 2002-2014 Microchip Technology Inc. DS20001370E-page 5 TC1232 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLES Pin No. Buffer/ Pin 8-pin Symbol Driver 16-pin Type PDIP, Type SOIC SOIC Function 1 2 PB RST I ST Push Button Reset Input. Input for a Manual Reset Switch. This input debounces (ignores) pulses less than 1 ms in duration and is ensured to recognize inputs of 20 ms or greater. L = Manual Reset Switch is Active, Force RST/RST pins Active H = Manual Reset Switch is Inactive. State of RST/RST pins determined by other system conditions. 2 4 TD I ST Time Delay Input. The voltage level on this input determines the Watchdog Timer Time-out period. TD = 0V tTD = 150 ms TD = Open tTD = 600 ms TD = VCC tTD = 1.2s 3 6 TOL I ST Tolerance Input. TOL = GND, Max Voltage Trip Point (VCCTP) = 4.75V (5% tolerance) TOL = VCC, Max Voltage Trip Point (VCCTP) = 4.5V (10% tolerance) 4 8 GND — P 5 9 RST O Push Pull Reset Output (Active-High) Goes active (High) if one of these conditions occurs: 1. If VCC falls below the selected Reset voltage threshold. 2. If PB RST pin is forced low. 3. If ST pin is not strobed within the minimum selected time-out period. (see TD pin) 4. During power-up. 6 11 RST O Open Drain Reset Output (Active-Low) Goes active (Low) if one of these conditions occurs: 1. If VCC falls below the selected Reset voltage threshold. 2. If PB RST pin is forced low. 3. If ST pin is not strobed within the minimum selected time-out period. (see TD pin) 4. During power-up. 7 13 ST I ST 8 15 VCC — P The positive supply (+5V) for the device. — 1,3,5, 7,10,1 2,16 NC — — No internal connection. DS20001370E-page 6 The ground reference for the device. Strobe Input Input for Watchdog Timer. WDT period determined by state of TD pin Falling Edge Resets Watchdog Timer counter (no time-out) 2002-2014 Microchip Technology Inc. TC1232 4.0 OPERATIONAL DESCRIPTION 4.1 Power Monitor VCC = 5V The TC1232 provides the function of warning the processor of a power failure. When VCC is detected as being below the voltage levels defined by the TOL pin, the TC1232’s comparator outputs the RST and RST signals to a logic level that warns the system of an outof-tolerance power supply. The RST and RST signals switch at a threshold value of 4.5V if TOL is tied to VCC, and at a value of 4.75V if TOL is grounded. The RST and RST signals are held active for a minimum of 250 ms to ensure that the power supply voltage has been stabilized. +4.5V (5% Trip Point) +4.25V (10% Trip Point) tRPD RST VOH VOL Figure 4-1 shows the VCC fall time. RST Figure 4-2 shows the VCC rise time. VCC SLEW RATE = 1.66 mV/µs (0.5V/300 µs) Figure 4-3 shows the time from when the voltage trip point is detected to the Reset output pin going active. Figure 4-4 shows the time from when the voltage trip point is exited to the Reset output pin going inactive. FIGURE 4-3: VCC Detect Reset Output Delay (Power-Down). 4.6V (5% Trip Point) tF VCC 4.5V(10% Trip Point) +4.75V VCC +4.25V tRPU RST VOH FIGURE 4-1: Power-Down Slew Rate. RST VOL FIGURE 4-4: VCC Detect Reset Output Delay (Power-Up). tR +4.75V +4.25V VCC FIGURE 4-2: Power-up Slew Rate. 2002-2014 Microchip Technology Inc. DS20001370E-page 7 TC1232 4.2 Push Button Reset Input +5V The debounced manual Reset input (PB RST) manually forces the Reset outputs into their active states. Figure 4-5 shows a block diagram for using the TC1232 with a push button switch. VCC Once PB RST has been low for a time tPBD (the push button delay time), the Reset outputs go active. The Reset outputs remain in their active states for a minimum of 250 ms after PB RST rises above VIH. Figure 4-6 shows a waveform for the push button switch input and the Reset pins output. A mechanical push button or active logic signal can drive the PB RST input. The debounced input ignores input pulses less than 1 ms and recognizes pulses of 20 ms or greater. No external pull-up resistor is required because the PB RST input has an internal pull-up to VCC of approximately 100 µA. TD ST PB RST TC1232 I/O Microprocessor RST Reset GND TOL FIGURE 4-5: Watchdog Timer. Push Button Reset and tPB PB RST tPBD VIH VIL tRST RST RST The debounced PB RST input ignores input pulses less than 1 ms and is designed to recognize pulses of 20 ms or greater. FIGURE 4-6: PB RST Input. DS20001370E-page 8 Push Button Reset – 2002-2014 Microchip Technology Inc. TC1232 4.3 Watchdog Timer When the ST input is not stimulated for a preset time period, the Watchdog Timer function forces RST and RST signals to the active state. The preset time period is determined by the TD inputs to be 150 ms with TD connected to ground, 600 ms with TD floating or 1200 ms with TD connected to VCC (typ.). The Watchdog Timer starts timing-out from the set time period as soon as RST and RST are inactive. If a highto-low transition occurs on the ST input pin prior to time-out, the Watchdog Timer is reset and begins to time-out again. If the Watchdog Timer is allowed to time-out, the RST and RST signals are driven to the active state for 250 ms, minimum (Figure 4-7). The software routine that strobes ST is critical. The code must be in a section of software that is executed frequently enough so the time between toggles is less than the Watchdog Time-out period. One common technique controls the microprocessor I/O line from two sections of the program. The software might set the I/O line high while operating in the Foreground mode and set it low while in the Background or Interrupt modes. If both modes do not execute correctly, the Watchdog Timer issues Reset pulses. tTD is the maximum elapsed time between ST high-tolow transitions (ST is activated by falling edges only), which will keep the Watchdog Timer from forcing the Reset outputs active for a time of tRST. tTD is a function of the voltage at the TD pin, as tabulated below: TABLE 4-1: WATCHDOG TIMER PERIODS tTD Condition Min. Typ. Max. TD pin = 0V 62.5 ms 150 ms 250 ms TD pin = Open 250 ms 600 ms 1000 ms TD pin = VCC 500 ms 1200 ms 2000 ms Figure 4-8 shows the expected Reset output pin waveforms depending on the period of the ST pin falling edge and the state of the TD input pin. ST tTD tST RST (when tTD tTD (min)) “H” RST (when tTD(min) tTD tTD(max)) RST (when tTD tTD(max)) RST (when tTD tTD(min)) “L” RST (when tTD(min) tTD tTD(max)) RST (when tTD tTD(max)) FIGURE 4-8: 4.4 Strobe Input. Supply Monitor Noise Sensitivity The TC1232 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 0.01 µF or 0.1 µF bypass capacitor to reduce detection sensitivity. This capacitor should be installed as close to the TC1232 as possible to keep the capacitor lead length short. Figure 4-7 shows a block diagram for using the TC1232 with a PIC® MCU and the Watchdog input. +5V 10 k 3-Terminal Regulator (example: MCP1700) +5V 0.1 µF VCC RST RESET TC1232 ST I/O PIC® MCU TD TOL GND FIGURE 4-7: Watchdog Timer. 2002-2014 Microchip Technology Inc. DS20001370E-page 9 TC1232 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 8-Lead PDIP (300 mil) XXXXXXXX XXXXXNNN YYWW TC1232 I/P256 0518 8-Lead SOIC (150 mil) 16-Lead SOIC (150 mil) XXXXXXXXXXXXX XXXXXXXXXXXXX YYWWNNN Legend: XX...X Y YY WW NNN e3 * DS20001370E-page 10 TC1232 e3 256 CPA^^ 0518 OR Examples: TC1232 COA0518 256 XXXXXXXX XXXXYYWW NNN Note: Examples: TC1232E e3 0518 OA^^ 256 OR Examples: e3 TC1232COE^^ TC1232COE XXXXXXXXXX 0518256 OR XXXXXXXXXX 0518256 Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC® designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 2002-2014 Microchip Technology Inc. TC1232 4&'!&"& 5#*!( !!& 5 %&&#& && 366***' '6 5 N NOTE 1 E1 1 3 2 D E A2 A L A1 c e eB b1 b 7&! '!:'&! 8"')%! 8,9. 8 8 8; < = & && > > ##55!! 1 - 1 2!&& 1 > > "#&"#?#& . - -1 ##5?#& . 1 = ; :& -= -1 && : 1 - 1 :#5!! = 1 ) ) = 2 > > 7 :#?#& :*:#?#& ; * + 2, - !"#$%&"' ()"&'"!&)&#*&&&# +%&,&!& - '!!#.#&"#'#%! &"!!#%! &"!!!&$#/ !# '!#& .01 2,32!'!&$& "!**&"&&! * ,=2 2002-2014 Microchip Technology Inc. DS20001370E-page 11 TC1232 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS20001370E-page 12 2002-2014 Microchip Technology Inc. TC1232 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2002-2014 Microchip Technology Inc. DS20001370E-page 13 TC1232 ! " "##$%&'!"( 4&'!&"& 5#*!( !!& 5 %&&#& && 366***' '6 5 DS20001370E-page 14 2002-2014 Microchip Technology Inc. TC1232 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2002-2014 Microchip Technology Inc. DS20001370E-page 15 TC1232 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS20001370E-page 16 2002-2014 Microchip Technology Inc. TC1232 )* ! " "+,%-&.!"(# 4&'!&"& 5#*!( !!& 5 %&&#& && 366***' '6 5 2002-2014 Microchip Technology Inc. DS20001370E-page 17 TC1232 NOTES: DS20001370E-page 18 2002-2014 Microchip Technology Inc. TC1232 APPENDIX A: REVISION HISTORY Revision E (February 2014) • Removed the “Preliminary” watermark. Revision D (November 2012) • Added a note to the package outline drawing. Revision C (June 2005) The following is the list of modifications: 1. 2. 3. 4. Since no data is given in Section 2.0 “Typical Performance Curves”, “Preliminary” was added to the bottom of this document. Corrected Operating Voltage in the Electrical Specifications. General Data Sheet Enhancements. Added Revision History Appendix Section. Revision B (March 2003) • Not logged Revision A (March 2002) • Original Release of this Document. 2002-2014 Microchip Technology Inc. DS20001370E-page 19 TC1232 NOTES: DS20001370E-page 20 l 2002-2014 Microchip Technology Inc. TC1232 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device X /XX Temperature Range Package Device: TC1232: Microprocessor Monitor Temperature Range: C E Package: PA = Plastic DIP (300 mil Body), 8-lead OA = Plastic SOIC, (150 mil Body), 8-lead OA713 = Plastic SOIC, (150 mil Body), 8-lead Tape and Reel OE = Plastic SOIC (300 mil Body), 16-lead OE713 = Plastic SOIC (300 mil Body), 16-lead Tape and Reel = 0°C to +70°C = -40°C to +85°C 2002-2014 Microchip Technology Inc. Examples: a) TC1232COA: 0°C to +70°C, 8L-SOIC b) TC1232COA713: 0°C to +70°C, 8L-SOIC, Tape and Reel c) TC1232COE: 0°C to +70°C, 16L-SOIC d) TC1232COE713: 0°C to +70°C, 16L-SOIC Tape and Reel e) TC1232CPA: 0°C to +70°C, 8L-PDIP f) TC1232EOA: -40°C to +85°C, 8L-SOIC g) TC1232EOA713: -40°C to +85°C, 8L-SOIC, Tape and Reel h) TC1232EOE: -40°C to +85°C, 16L-SOIC i) TC1232EOE713: -40°C to +85°C, 16L-SOIC, Tape and Reel j) TC1232EPA: -40°C to +85°C, 8L-PDIP DS20001370E-page 21 TC1232 NOTES: DS20001370E-page 22 2002-2014 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, dsPIC, FlashFlex, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, PIC32 logo, rfPIC, SST, SST Logo, SuperFlash and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor, MTP, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. Analog-for-the-Digital Age, Application Maestro, BodyCom, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP, Mindi, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE, rfLAB, Select Mode, SQI, Serial Quad I/O, Total Endurance, TSHARC, UniWinDriver, WiperLock, ZENA and Z-Scale are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. GestIC and ULPP are registered trademarks of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. © 2002-2014, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. ISBN: 978-1-62077-944-6 QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV == ISO/TS 16949 == 2002-2014 Microchip Technology Inc. Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. 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