TC622

TC622/TC624 Low Cost Single Trip Point Temperature Sensor Features • Temperature Set Point Easily Programs with a Single External Resistor • Operates with 2.7V Power Supply (TC624) • TO-220 Package for Direct Mounting to Heatsink (TC622XAT) or Standard 8-Pin PDIP and SOIC General Description The TC622 and TC624 are programmable solid-state temperature sensors designed to replace mechanical switches in sensing and control applications. Both devices integrate the temperature sensor with a voltage reference and all required detector circuitry. The desired temperature set point is set by the user with a single external resistor. Ambient temperature is sensed and compared to the programmed set point. The OUT and OUT outputs are driven to their active state when the measured temperature exceeds the programmed set point. The TC622 has a power supply voltage range of 4.5V to 18.0V while the TC624 operates over a power supply range of 2.7V to 4.5V. Both devices are usable over a temperature range of -40°C to +125°C (TC622VXX, TC624VXX). Both devices feature low supply current making them suitable for portable applications. Eight-pin through-hole and surface mount packages are available. The TC622 is also offered in a 5-pin TO-220 package. The TC622 and TC624 are single point temperature detectors ideal for use in a wide variety of applications. Applications • • • • • Power Supply Over-Temperature Detection Consumer Electronics Fire/ Heat Detection UPSs, Amplifiers, Motors CPU Thermal Management in PCs Device Selection Table Part Number TC622COA TC622CPA TC622EAT TC622EOA TC622EPA TC622VAT TC622VOA TC622VPA TC624COA TC624CPA TC624EOA TC624EPA TC624VOA TC624VPA Voltage Operation 4.5V to 18V 4.5V to 18V 4.5V to 18V 4.5V to 18V 4.5V to 18V 4.5V to 18V 4.5V to 18V 4.5V to 18V 2.7V to 4.5V 2.7V to 4.5V 2.7V to 4.5V 2.7V to 4.5V 2.7V to 4.5V 2.7V to 4.5V Package 8-Pin SOIC 8-Pin PDIP 5-Pin TO-220 8-Pin SOIC 8-Pin PDIP 5-Pin TO-220 8-Pin SOIC 8-Pin PDIP 8-Pin SOIC 8-Pin PDIP 8-PinSOIC 8-Pin PDIP 8-Pin SOIC 8-Pin PDIP Ambient Temperature 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +125°C -40°C to +125°C -40°C to +125°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +125°C -40°C to +125° 2002 Microchip Technology Inc. DS21440B-page 1 © TC622/TC624 Package Type PDIP NC OUT OUT GND 1 2 3 4 8 NC VDD NC TSET NC OUT OUT GND 1 2 3 4 SOIC 8 NC VDD NC TSET SOT-220 TC622CPA TC622EPA TC622VPA 7 6 5 TC622COA TC622EOA TC622VOA 7 6 5 TC622EAT TC622VAT NC OUT OUT GND 1 2 3 4 8 NC NC OUT 1 2 3 4 8 NC VDD 12345 TC624CPA TC624EPA TC624VPA OUT OUT +9V OUT GND 6 5 NC TSET 6 NC 5 TSET Note: For TO-220 Package, Pin 3 is connected to case heatsink. Functional Block Diagram 9V Battery RSET Horn 1 5 NC TSET VDD 7 Microcontrollers NC 8 TC622 TC624 6 4 OUT NC GND OUT 3 2 ALARM © DS21440B-page 2 2002 Microchip Technology Inc. GND TSET VDD 7 VDD TC624COA TC624EOA TC624VOA 7 TC622/TC624 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 (TC622) ......................................... 20V (TC624) ........................................ 5.5V Input Voltage Any Input .. (GND – 0.3V) to (VDD +0.3V) Operating Temperature ...................... -40°C to +125°C C Version .............................. 0°C to +70°C E Version ........................... -40°C to +85°C V Version ......................... -40°C to +125°C Storage Temperature ......................... -65°C to +150°C . TC622/TC624 ELECTRICAL SPECIFICATIONS Electrical Characteristics: Over operating temperature range, unless otherwise specified. Symbol VDD IDD VOH Parameter Supply Voltage Range Supply Current Output Voltage (High) Device TC622 TC624 TC622 TC624 TC622 Min 4.5 2.7 — — 0.90 x VDD 0.80 x VDD VOL Output Voltage (Low) TC622 — — — — 0.90 x VDD 0.80 x VDD — — — T-5 T-5 — — Typ — — 200 170 — — — — — — — — — — T±1 T±1 2 2 Max 18 4.5 600 300 — — 0.15 x VDD 0.30 x VDD 0.35 x VDD — — 0.1 x VDD 0.2 x VDD 0.25 x VDD T+5 T+5 — — V Unit V µA V 5.0V ≤ VDD ≤ 18V 2.7V ≤ VDD ≤ 4.5V 5.0V ≤ VDD ≤ 18V, -40°C ≤ TA ≤ +125°C, IOH = 250µA IOH = 500µA -40°C ≤ TA ≤ +85°C, IOL = 500µA IOL = 1mA -40°C ≤ TA ≤ +125°C, IOL = 1mA 2.7V ≤ VDD ≤ 4.5V -40°C ≤ TA ≤ +125°C, IOH = 250µA IOH = 500µA -40°C ≤ TA ≤ +85°C, IOL = 500µA IOL = 1mA -40°C ≤ TA ≤ +125°C, IOL = 1mA TSET = Programmed Temperature TSET = Programmed Temperature Test Conditions VOH Output Voltage (High) TC624 V V VOL Output Voltage (Low) TC624 TSET OUT Absolute Accuracy Trip Point Hysteresis TC622 TC624 TC622 TC624 °C °C 2002 Microchip Technology Inc. DS21440B-page 3 © TC622/TC624 2.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 2-1. TABLE 2-1: Pin No. (8-Pin SOIC) (8-Pin PDIP) 1 2 3 4 5 6 7 8 PIN FUNCTION TABLE Symbol NC OUT OUT GND TSET NC VDD NC No Internal Connection. Active low output. Active high output. Ground Terminal. Temperature set point. Connect an external 1% resistor from TSET to VCC to set trip point. No Internal Connection. Power supply input. No Internal Connection. Description Pin No. (5-Pin SOT-220) 1 2 3 4 5 Symbol OUT OUT VDD GND TSET Active low output. Active high output. Power supply input. Ground Terminal. Description Temperature set point. Connect an external 1% resistor from TSET to VCC to set trip point. © DS21440B-page 4 2002 Microchip Technology Inc. TC622/TC624 3.0 3.1 DETAILED DESCRIPTION Trip Point Programming 3.2 Hysteresis When the temperature of the device exceeds the programmed temperature trip point, TSET, the OUT and OUT outputs are driven into their active states. The desired trip point temperature is programmed with a single external resistor connected between the TSET input and VCC. The relationship between the resistor value and the trip point temperature is given by Equation 3-1. To prevent output “chattering” at the trip point temperature, the temperature detector in the TC622/TC624 has 2°C hysteresis (see Figure 3-2). The outputs are driven active when the temperature crosses the set point determined by the external resistor. As temperature declines below the set point, the hysteresis action will hold the outputs true until the temperature drops 2°C below the threshold. FIGURE 3-2: TC622/TC624 HYSTERESIS Temperature EQUATION 3-1: RTRIP = 0.5997 x T 2.1312 Where: RTRIP = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin. Set Point (Set Point – 2 Degrees C) OUT For example, as shown in Figure 3-1, to program the device to trip at 50°C, the programming resistor is: RTRIP = 0.5997 x ((50 + 273.15)2.1312) = 133.65kΩ OUT FIGURE 3-1: PROGRAMMING RESISTOR VALUES VS. TEMPERATURE 250 RESISTANCE, RTRIP (kΩ) 200 150 100 50 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (˚C) 2002 Microchip Technology Inc. DS21440B-page 5 © TC622/TC624 4.0 4.1 TYPICAL APPLICATIONS Over-Temperature Shutdown 4.2 Cooling and Heating Applications The TC622 can be used to create a simple over-temperature shutdown circuit. In this circuit, temperature is sensed within the system enclosure (internal system ambient) or at the heatsink itself. When measured temperature exceeds a preset limit, a fault is indicated and the system shuts down. Figure 4-1 illustrates an over-temperature shutdown circuit using the TC622 sensor in a single TO-220 package, allowing direct attachment to the heatsink surface. As shown, the TC622 outputs are driven active when the heatsink temperature equals the trip point temperature set by RTRIP. When this happens, the crowbar circuit is activated, causing the supply output to fold back to zero. The TC622 outputs remain active until the heatsink temperature falls a minimum of 2°C (built-in hysteresis) below the trip point temperature, at which time the device again allows normal supply operation. The TC622/TC624 can be used to control a DC fan as shown in Figure 4-2. The fan turns on when the sensed temperature rises above T SET and remains on until the temperature falls below TSET - 2°C. Figure 4-3 shows the TC622 acting as a heater thermostat. Circuit operation is identical to that of the cooling fan application. FIGURE 4-1: TC622 POWER SUPPLY OVER-TEMPERATURE SHUTDOWN Heatsink Output Device TC622 VCC Output Device VOUT Circuit Board TC622 Heatsink Mounting RTRIP Power Good Signal TC622 TSET VDD OUT GND OUT OVERTEMP Crowbar Circuit Heatsink Surface © DS21440B-page 6 2002 Microchip Technology Inc. TC622/TC624 FIGURE 4-2: TC624 AS A FAN CONTROLLER FOR NOTEBOOK PC +2.7 to 4.5V +12V FIGURE 4-3: TC622 AS A HEATER THERMOSTAT +4.5 to 18.0V +12V RSET 1 NC VDD 7 NC 8 + DC Fan RSET 1 VDD 7 NC NC 8 Heater 5T SET 5T SET TC622 6 NC OUT OUT 2 N-Channel Level Logic MOSFET TC624 6 4 NC GND OUT 3 N-Channel Logic Level MOSFET 4 GND OUT 2 Temperature Temperature OUT Fan "On" TSET TSET TSET – 2 C TSET – 2 C OUT Heater "On" 2002 Microchip Technology Inc. DS21440B-page 7 © TC622/TC624 5.0 5.1 PACKAGING INFORMATION Package Marking Information Package marking data not available at this time. 5.2 Taping Form Component Taping Orientation for 8-Pin SOIC (Narrow) Devices User Direction of Feed PIN 1 W P Standard Reel Component Orientation for TR Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 8-Pin SOIC (N) 12 mm 8 mm 2500 13 in 5.3 Package Dimensions 8-Pin Plastic DIP PIN 1 .260 (6.60) .240 (6.10) .045 (1.14) .030 (0.76) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92) .070 (1.78) .040 (1.02) .310 (7.87) .290 (7.37) .040 (1.02) .020 (0.51) .015 (0.38) .008 (0.20) .400 (10.16) .310 (7.87) 3° MIN. .110 (2.79) .090 (2.29) .022 (0.56) .015 (0.38) Dimensions: inches (mm) © DS21440B-page 8 2002 Microchip Technology Inc. TC622/TC624 5.4 Package Dimensions (Continued) 8-Pin SOIC PIN 1 .157 (3.99) .150 (3.81) .244 (6.20) .228 (5.79) .050 (1.27) TYP. .197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) 8° MAX. . .050 (1.27) .016 (0.40) Dimensions: inches (mm) .010 (0.25) .007 (0.18) 5-Pin TO-220 .185 (4.70) .165 (4.19) .117 (2.97) .103 (2.62) .415 (10.54) .390 (9.91) .156 (3.96) .140 (3.56) DIA. .055 (1.40) .045 (1.14) .293 (7.44) .204 (5.18) .613 (15.57) .569 (14.45) 3° - 7.5° 5 PLCS. .590 (14.99) .482 (12.24) .037 (0.95) .025 (0.64) .025 (0.64) .012 (0.30) .072 (1.83) .062 (1.57) .273 (6.93) .263 (6.68) .115 (2.92) .087 (2.21) PIN 1 Dimensions: inches (mm) 2002 Microchip Technology Inc. DS21440B-page 9 © TC622/TC624 NOTES: © DS21440B-page 10 2002 Microchip Technology Inc. TC622/TC624 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. DS21440B-page 9 © TC622/TC624 NOTES: © DS21440B-page 10 2002 Microchip Technology Inc. TC622/TC624 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. 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