TC623 3V, Dual Trip Point Temperature Sensor Package Type Features • Integrated Temp Sensor and Detector Operate from a Supply Voltage as Low as 2.7V • Replaces Mechanical Thermostats and Switches • On-Chip Temperature Sense • 8-Pin DIP or SOIC for Direct PCB Mounting • 2 User Programmable Temperature Set Points • 2 Independent Temperature Limit Outputs • Heat/Cool Regulate Output Applications • • • • • • CPU Thermal Management System Over or Under Temperature Shutdown Advanced Thermal Warning Fan Speed Control Circuits Accurate Appliance Temperature Sensing Environmental Control Device Selection Table Part Number Package Temp. Range TC623CCOA 8-Pin SOIC 0°C to +70°C TC623CCPA 8-Pin PDIP 0°C to +70°C TC623CEOA 8-Pin SOIC -40°C to +85°C TC623CEPA 8-Pin PDIP -40°C to +85°C TC623CVOA 8-Pin SOIC -40°C to +125°C NOTE: Latch Output (C option), is a Standard Device. Contact Factory for Latch Q Output (H option). Functional Block Diagram NC 1 2 1 8 VCC LOW SET 2 7 LOW LIMIT HIGH SET 3 GND 4 NC TC623CCOA TC623CEOA TC623CVOA 6 HIGH LIMIT 5 CONTROL PDIP NC 1 LOW SET 2 HIGH SET 3 GND 4 TC623CCPA TC623CEPA 8 VCC 7 LOW LIMIT 6 HIGH LIMIT 5 CONTROL General Description The TC623 is a 3V solid-state, programmable temperature sensor designed for use in thermal management applications. It features dual thermal interrupt outputs (LOW LIMIT and HIGH LIMIT) each of which are set with an external resistor. The HIGH LIMIT and LOW LIMIT outputs are driven active (high) when measured temperature equals the user programmed limits. The CONTROL output is driven active (high) when temperature equals the HIGH LIMIT set point and turned off when temperature falls below the LOW LIMIT set point. The CONTROL output can be used to provide simple ON/OFF control to a cooling fan if so desired. Low voltage operation, easy set point programming, small size and low cost make the TC623 an ideal choice for many thermal management applications. 8 Temperature To Voltage Converter VREF Gen. VCC TC623 + LOW SET SOIC 7 LOW LIMIT – VREF + 6 HIGH LIMIT HIGH SET GND 3 VREF Gen. – R SQ Latch 4 5 CONTROL RLOW < R HIGH 2002 Microchip Technology Inc. DS21441B-page 1 TC623 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 ......................................................5.5V Input Voltage Any Input .. (GND – 0.3V) to (VDD +0.3V) Package Power Dissipation (TA ≤ 70°C) Plastic DIP .............................................730mW SOIC......................................................470mW Derating Factors Plastic DIP ............................................8mW/°C SOIC .....................................................6mW/°C Operating Temperature V Version ................................. -40°C to +125°C E Version ................................... -40°C to +85°C C Version ...................................... 0°C to +70°C Storage Temperature.......................... -65°C to +150°C TC623 ELECTRICAL SPECIFICATIONS Electrical Characteristics: Over Operating Temperature Range, VDD = 2.7V to 4.5V, unless otherwise specified. Symbol Parameter Min Typ. Max Unit Test Conditions VDD Supply Voltage Range 2.7 — 4.5 V IDD Supply Current — 150 250 µA 2.7V ≤ VDD ≤ 4.5V TSET Absolute Accuracy T- 3 T ±1 T+3 °C T = Programmed Temperature VOH Output Voltage High 0.9 x VDD 0.8 x VDD — — — — V V IOH = 250µA IOH = 500µA VOL Output Voltage Low — — — — 0.1 x VDD 0.2 x VDD V V IOL = 500 µA IOL = 1mA HYS Hysteresis — — -2 °C Falling Temperature DS21441B-page 2 2002 Microchip Technology Inc. TC623 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) PIN FUNCTION TABLE Symbol Description 1 NC 2 LOW SET No Internal Connection. Low temperature set point. Connect an external 1% resistor from LOW SET to VDD to set trip point. 3 HIGH SET High temperature set point. Connect an external 1% resistor from HIGH SET to VDD to set trip point. 4 GND 5 CONTROL 6 HIGH LIMIT High temperature push/pull output. 7 LOW LIMIT Low temperature push/pull output. 8 VCC 2002 Microchip Technology Inc. Ground Terminal. Control output. Power supply input. DS21441B-page 3 TC623 3.0 DETAILED DESCRIPTION 3.1 TC623 Operation The TC623 has a positive temperature coefficient (Silicon) temperature sensor and dual threshold detector. Temperature set point programming is accomplished with external resistors from the HIGH SET and LOW SET inputs to VCC. The HIGH LIMIT and LOW LIMIT outputs remain inactive (low) as long as the measured temperature is below set point values. As temperature increases, the LOW LIMIT is driven high when temperature equals the LOW LIMIT set point (±3°C). If temperature continues to climb, the HIGH LIMIT output is driven high when temperature equals the HIGH LIMIT set point (±3°C). Figure 3-1 shows the relationship between the sense resistance values and trip point temperature. FIGURE 3-1: TC623 SENSE RESISTORS VS. TRIP TEMPERATURE RESISTANCE, RTRIP (kΩ) 250 200 150 100 50 -55 -35 -15 5 25 45 65 85 105 125 The CONTROL output is driven high when the HIGH LIMIT output goes high and is RESET low when the LOW LIMIT output goes low. This output provides the logic for simple ON/OFF fan control. Figure 3-2 shows overall TC623 operation. FIGURE 3-2: TC623 TEMPERATURE VS. OUTPUT High Set Point Temperature Low Set Point Low Limit Output High Limit Output Control Output (Cool Option) To prevent output "chattering" when measured temperature is at (or near) the trip point values, the LOW SET and HIGH SET inputs each have a built-in hysteresis of -2°C max. As a result, the HIGH LIMIT and LOW LIMIT outputs remain active until the measured temperature falls a maximum of 2°C below the programmed HIGH SET and LOW SET thresholds as shown in Figure 3-3. The programmed setting threshold of Figure 3-3 is user programmed temperature trip points of either the LOW SET or HIGH SET inputs. The LOW LIMIT or HIGH LIMIT output is driven active when temperature equals the set point value (to within 3°C). The output remains active until the temperature falls an additional 2°C below the set point due to hysteresis. FIGURE 3-3: TEMPERATURE (˚C) HIGH SET AND LOW SET THRESHOLDS Programmed Setpoint -2˚C Hysteresis High Limit or Low Limit Ouput DS21441B-page 4 2002 Microchip Technology Inc. TC623 4.0 TYPICAL APPLICATIONS 4.1 Mounting If the TC623 is used to measure the temperature of another device, it is important that the top surface of the TC623 package be in intimate contact with the measured device. Good thermal conductivity and no air space is critical to accurate temperature measurement in applications of this type. 4.2 Trip Point Programming The resistance values required for the HIGH SET and LOW SET inputs are calculated using the formula below: RTRIP = 0.5997 x T 2.1312 Where; RTRIP = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin. For example, to program a trip point of 50°C, the programming resistor is: RTRIP = 0.5997 x (50 + 273.15)2.1312) = 133.65kΩ 2002 Microchip Technology Inc. DS21441B-page 5 TC623 5.0 PACKAGING INFORMATION 5.1 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 8-Pin SOIC (N) 5.3 Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 12 mm 8 mm 2500 13 in Package Dimensions 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) .010 (0.25) .007 (0.18) 8° MAX.. .050 (1.27) .016 (0.40) Dimensions: inches (mm) DS21441B-page 6 2002 Microchip Technology Inc. TC623 Package Dimensions (Continued) 8-Pin Plastic DIP PIN 1 .260 (6.60) .240 (6.10) .045 (1.14) .030 (0.76) .070 (1.78) .040 (1.02) .310 (7.87) .290 (7.37) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .040 (1.02) .020 (0.51) .150 (3.81) .115 (2.92) .110 (2.79) .090 (2.29) .022 (0.56) .015 (0.38) .015 (0.38) .008 (0.20) 3° MIN. .400 (10.16) .310 (7.87) Dimensions: inches (mm) 2002 Microchip Technology Inc. DS21441B-page 7 TC623 NOTES: DS21441B-page 8 2002 Microchip Technology Inc. TC623 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. DS21441B-page 9 TC623 NOTES: DS21441B-page 10 2002 Microchip Technology Inc. TC623 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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