TC623 TC623CCOA TC623CCPA TC623CEOA TC623CEPA TC623CVOA DS21441A TC623-5 11F-3

3V, Dual Trip Point Temparature Sensor FEATURES GENERAL DESCRIPTION s The TC623 is a 3V solid-state, programmable temperature

TC623 TC623 3V, Dual Trip Point Temparature Sensor FEATURES GENERAL DESCRIPTION s The TC623 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 program with a single 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 setpoint, and turned off when temperature falls below the LOW LIMIT setpoint. The CONTROL output can be used to provide simple ON/OFF control to a cooling fan if so desired. Low voltage operation, easy setpoint programming, small size and low cost make the TC623 TC623 an ideal choice for many thermal management applications. s s s s s s 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 s s s s s s CPU Thermal Management System Over-or Under-Temperature Shutdown Advanced Thermal Warning Fan Speed Control Circuits Accurate Appliance Temperature Sensing Environmental Control ORDERING INFORMATION Part No. TC623CCOA TC623CCOA TC623CCPA TC623CCPA TC623CEOA TC623CEOA TC623CEPA TC623CEPA TC623CVOA TC623CVOA FUNCTIONAL BLOCK DIAGRAM NC 1 8 VCC TEMP TO VOLTAGE CONVERTER + LOW SET VREF GEN. 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 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 NOTE: Latch Q Output, ("C" Option), is a Standard Device. Contact Factory for Latch Q Output, ("H" Option). PIN CONFIGURATION (DIP and SOIC) TC623 TC623 2 Temperature Range Package 7 LOW LIMIT NC HIGH SET 3 6 VCC 7 LOW LIMIT 3 6 HIGH LIMIT GND + 8 2 HIGH SET VREF 1 LOW SET 4 5 CONTROL HIGH LIMIT VREF GEN. R S 5 CONTROL 4 LATCH RLOW < RHIGH Q NC DS21441A DS21441A HIGH SET 3 4 TC623CCPA TC623CCPA TC623CEPA TC623CEPA VCC 7 2 GND © 2001 Microchip Technology Inc. 8 1 LOW SET GND TC623CCOA TC623CCOA TC623CEOA TC623CEOA TC623CVOA TC623CVOA LOW LIMIT 6 HIGH LIMIT 5 CONTROL TC623-5 TC623-5 9/18/96 3V, Dual Trip Point Temparature Sensor TC623 TC623 Maximum Chip Temperature . +150°C Storage Temperature . 65°C to +150°C Lead Temperature (Soldering, 10 sec) . +300°C ABSOLUTE MAXIMUM RATINGS* Package Power Dissipation (TA 70°C) Plastic DIP .730mW SOIC . 470mW Derating Factors Plastic DIP . 8mW/°C SOIC . 6mW/°C Supply Voltage .5.5V Input Voltage Any Input . (GND 0.3V) to (VDD +0.3V) Operating Temperature V Version . 40°C to +125°C E Version . 40°C to +85°C C Version . 0°C to +70°C ELECTRICAL CHARACTERISTICS Parameter *Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. 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. Over Operating Temperature Range) VDD = 2.7V to 4.5V, unless otherwise specified. Conditions Supply Voltage Range Supply Current Absolute Accuracy VOH Min VOL Hysteresis Max 2.7 - T3 0.9 x VDD 0.8 x VDD - - - 2.7V VDD 4.5V T = Programmed Temperature IOH = 250µA IOH = 500µA IOL = 500µA IOL = 1mA Falling Temperature Typ* - 150 T ±1 - - - - - 4.5 250 T +3 - - 0.1 x VDD 0.2 x VDD 2 Unit V µA °C V V V V °C * Measured at 25°C creases, the LOW LIMIT is driven high when temperature equals the LOW LIMIT setpoint (±3°C). If temperature continues to climb, the HIGH LIMIT output is driven high when temperature equals the HIGH LIMIT setpoint (±3°C). Figure 1 shows the relationship between the sense resistance values and trip point temperature. 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 2 shows overall TC623 TC623 operation. RESISTANCE (k) 250 200 150 100 50 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (°C) Figure 1. TC623 TC623 Sense Resistors vs. Trip Temperature HIGH SET POINT DETAILED DESCRIPTION TC623 TC623 Operation TEMPERATURE LOW SET POINT LOW LIMIT OUTPUT The TC623 TC623 consists of a positive temperature coefficient (PTC) temperature sensor and dual threshold detector. Temperature set point programming is easily accomplished with external programming 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 setpoint values. As temperature inTC623-5 9/18/96 HIGH LIMIT OUTPUT CONTROL OUTPUT (COOL OPTION) Figure 2. TC623 TC623 Temperature vs. Output 2 © 2001 Microchip Technology Inc. DS21441A DS21441A 3V, Dual Trip Point Temparature Sensor TC623 TC623 APPLICATIONS Mounting To prevent output "chattering" when measured temperature is at (or near) the programmed 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. The programmed setting threshold of Figure 3 is userprogrammed 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 programmed setpoint value (to within 3°C). The output remains active until the temperature falls an additional 2°C below the setpoint due to hysteresis. If the TC623 TC623 is used to measure the temperature of another device, it is important that the top surface of the TC623 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. 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. PROGRAMMED SETPOINT 2°C HYSTERESIS For example, to program a trip point of 50°C, the programming resistor is: HIGH LIMIT OR LOW LIMIT OUTPUT RTRIP = 0.5997 x (50 + 273.15)2.1312) = 133,652 Figure 3. High Set and Low Set Thresholds PACKAGE DIMENSIONS 8-Pin PDIP (Narrow) 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) 2001 Microchip Technology Inc. DS21441A DS21441A .015 (0.38) .008 (0.20) 3° MIN. .400 (10.16) .310 (7.87) .022 (0.56) .015 (0.38) Dimensions: inches (mm) 3 TC623-5 TC623-5 9/18/96 3V, Dual Trip Point Temparature Sensor TC623 TC623 PACKAGE DIMENSIONS (Cont.) 8-Pin SOIC (Narrow) 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) TC623-5 TC623-5 9/18/96 .010 (0.25) .007 (0.18) 8° MAX. .050 (1.27) .016 (0.40) 4 Dimensions: inches (mm) © 2001 Microchip Technology Inc. DS21441A DS21441A 3V, Dual Trip Point Temparature Sensor TC623 TC623 WORLDWIDE SALES AND SERVICE AMERICAS New York Corporate Office 150 Motor Parkway, Suite 202 Hauppauge, NY 11788 Tel: 631-273-5305 Fax: 631-273-5335 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com Rocky Mountain 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456 ASIA/PACIFIC (continued) San Jose Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408-436-7950 Fax: 408-436-7955 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-334-8870 Fax: 65-334-8850 Taiwan Atlanta 6285 Northam Drive, Suite 108 Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509 500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770-640-0034 Fax: 770-640-0307 Microchip Technology Taiwan 11F-3 11F-3, No. 207 Tung Hua North Road Taipei, 105, Taiwan Tel: 886-2-2717-7175 Fax: 886-2-2545-0139 ASIA/PACIFIC Austin EUROPE China - Beijing Australia Analog Product Sales 8303 MoPac Expressway North Suite A-201 Austin, TX 78759 Tel: 512-345-2030 Fax: 512-345-6085 Boston 2 Lan Drive, Suite 120 Westford, MA 01886 Tel: 978-692-3848 Fax: 978-692-3821 Boston Analog Product Sales Unit A-8-1 Millbrook Tarry Condominium 97 Lowell Road Concord, MA 01742 Tel: 978-371-6400 Fax: 978-371-0050 Toronto Microchip Technology Beijing Office Unit 915 New China Hong Kong Manhattan Bldg. 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