MC623 3V, Dual Trip Point Temperature Sensor The MC623 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 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. Features • Integrated Temperature Sensor and Detector Operate from a Supply Voltage as Low as 2.7V • 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 Typical Applications • CPU Thermal Management • System Over–or Under–Temperature Shutdown • Advanced Thermal Warning • Fan Speed Control Circuits • Accurate Appliance Temperature Sensing • Environmental Control http://onsemi.com SO–8 D SUFFIX CASE TBD PRELIMINARY INFORMATION PIN CONFIGURATION (Top View) 8 VCC NC 1 LOW SET 2 MC623D 7 LOW LIMIT 6 HIGH LIMIT HIGH SET 3 5 CONTROL GND 4 ORDERING INFORMATION Device MC623DR2 Package Shipping 8–Pin SOIC 2500 Tape/Reel FUNCTIONAL BLOCK DIAGRAM NC LOW SET 1 2 Temp to Voltage Converter Vref Gen. MC623 8 VCC + – 7 LOW LIMIT + – 6 HIGH LIMIT Vref HIGH SET 3 Vref Gen. R S GND 4 RLOW < RHIGH Semiconductor Components Industries, LLC, 1999 February, 2000 – Rev. 0 Latch Q 5 CONTROL 1 Publication Order Number: MC623/D MC623 ABSOLUTE MAXIMUM RATINGS* Value Unit Package Power Dissipation (TA ≤ 70°C) Parameter 470 mW Derating Factors 6.0 mW/°C Supply Voltage 5.5 V (GND – 0.3) to (VDD + 0.3) V Input Voltage, Any Input –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 Characteristic Min Typ1 Max Unit VDD Supply Voltage Range 2.7 — 4.5 V IDD Supply Current (2.7V ≤ VDD ≤ 4.5V) — 150 250 µA T–3 T±1 T+3 °C Absolute Accuracy T = Programmed Temperature VOH IOH = 250µA IOH = 500µA 0.9 x VDD 0.8 x VDD — — — — V VOL IOL = 500µA IOL = 1.0mA — — — — 0.1 x VDD 0.2 x VDD V HYST Hysteresis (Falling Temperature) — — –2.0 °C 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 RESISTANCE (kW ) 200 –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 High Set Point The resistance values required for the HIGH SET and LOW SET inputs are calculated using the formula below: 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) = 133,652W 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) ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. 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