MC623 3.0 V, Dual Trip Point Temperature Sensor The MC623 is a 3.0 V 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 exceeds the user-programmed limits. The CONTROL output is driven active (high) when temperature exceeds 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 MC623 an ideal choice for many thermal management applications. http://onsemi.com SO-8 D SUFFIX CASE TBD PRELIMINARY INFORMATION Features • Integrated Temperature Sensor and Detector Operate from a Supply • • • • • • • Voltage as Low as 2.7 V Replaces Mechanical Thermostats and Switches On-Chip Temperature Sense 8-Pin SOIC for Direct PCB Mounting 2 User-Programmable Temperature Set Points 2 Independent Temperature Limit Outputs Heat/Cool Regulate Output Operating Temperature Range: -40°C to +85°C PIN CONFIGURATION 8 VCC NC 1 LOW SET 2 MC623D 7 LOW LIMIT 6 HIGH LIMIT HIGH SET 3 5 CONTROL GND 4 (Top View) Typical Applications • • • • • • CPU Thermal Management System Over-or Under-Temperature Shutdown Advanced Thermal Warning Fan Speed Control Circuits Accurate Appliance Temperature Sensing Environmental Control Semiconductor Components Industries, LLC, 2003 February, 2003 - Rev. 3 ORDERING INFORMATION Device MC623DR2 1 Package Shipping 8-Pin SOIC 2500 Tape/Reel Publication Order Number: MC623/D MC623 FUNCTIONAL BLOCK DIAGRAM NC LOW SET Temp to Voltage Converter 1 MC623 Vref Gen. 2 8 VCC + − 7 LOW LIMIT + − 6 HIGH LIMIT Vref HIGH SET Vref Gen. 3 R S GND 4 Latch RLOW < RHIGH Q 5 CONTROL MAXIMUM RATINGS* Value Unit Package Power Dissipation (TA ≤ 70°C) Rating 470 mW Derating Factors 6.0 mW/°C Supply Voltage 5.5 Input Voltage, Any Input (GND - 0.3) to V (VDD + 0.3) V -40 to +125 °C Maximum Chip Temperature 150 °C Storage Temperature Range -65 to +150 °C +300 °C Operating Temperature Range Lead Temperature (Soldering, 10 Seconds) * Maximum Ratings are those values beyond which damage to the device may occur. ELECTRICAL CHARACTERISTICS (Over Operating Temperature Range, VDD = 2.7V to 4.5V, unless otherwise noted.) Symbol Min Typ1 Max Unit Supply Voltage Range VDD 2.7 - 4.5 V Supply Current (2.7V ≤ VDD ≤ 4.5V) IDD - 150 250 µA T-3 T±1 T+3 Characteristic °C Absolute Accuracy T = Programmed Temperature IOH = 250µA IOH = 500µA VOH 0.9 x VDD 0.8 x VDD - - V IOL = 500µA IOL = 1.0mA VOL - - 0.1 x VDD 0.2 x VDD V HYST - - -2.0 °C Hysteresis (Falling Temperature) 1. Measured at 25°C. http://onsemi.com 2 MC623 DETAILED DESCRIPTION MC623 Operation 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 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 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. The MC623 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 increases, the LOW LIMIT is driven high when temperature exceeds the LOW LIMIT setpoint (±3°C). If temperature continues to climb, the HIGH LIMIT output is driven high when temperature exceeds the HIGH LIMIT setpoint (±3°C). Figure 1 shows the relationship between the sense resistance values and trip point temperature. 250 Programmed Setpoint 200 RESISTANCE (k ) -2 °C Hysteresis 150 High Limit or Low Limit Output 100 Figure 3. High Set and Low Set Thresholds 50 -55 -35 -15 5 25 45 65 85 105 125 APPLICATIONS TEMPERATURE (°C) Mounting Figure 1. MC623 Sense Resistors vs. Trip Temperature If the MC623 is used to measure the temperature of another device, it is important that the top surface of the MC623 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. 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 MC623 operation. Trip Point Programming The resistance values required for the HIGH SET and LOW SET inputs are calculated using the formula below: High Set Point Temperature Low Set Point RTRIP = 0.5997 x T 2.1312 Where Rtrip = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin. Low Limit Output High Limit Output For example, to program a trip point of 50°C, the programming resistor is: Control Output (Cool Option) RTRIP = 0.5997 x (50 + 273.15)2.1312) = 133,652 Figure 2. MC623 Temperature vs. Output http://onsemi.com 3 MC623 PACKAGE DIMENSIONS 8-Pin SOIC PLASTIC PACKAGE CASE TBD ISSUE TBD PIN 1 indicated by dot and/or beveled edge .157 (3.99) .244 (6.20) .150 (3.81) .228 (5.79) .050 (1.27) TYP. .197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .018 (0.46) .014 (0.36) .010 (0.25) .007 (0.18) 8 MAX. .010 (0.25) .004 (0.10) .050 (1.27) .016 (0.40) Dimensions: inches (mm) http://onsemi.com 4 MC623 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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PUBLICATION ORDERING INFORMATION Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: [email protected] JAPAN: ON Semiconductor, Japan Customer Focus Center 2-9-1 Kamimeguro, Meguro-ku, Tokyo, Japan 153-0051 Phone: 81-3-5773-3850 ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative. N. American Technical Support: 800-282-9855 Toll Free USA/Canada http://onsemi.com 5 MC623/D