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| 1 TC623 3V, DUAL TRIP POINT TEMPERATURE SENSOR FEATURES s 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 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 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 an ideal choice for many thermal management applications. 2 3 4 5 6 VCC LOW LIMIT HIGH LIMIT CONTROL 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. Package 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC Temperature Range 0C to +70C 0C to +70C - 40C to +85C - 40C to +85C - 40C to +125C FUNCTIONAL BLOCK DIAGRAM TC623CCOA TC623CCPA TC623CEOA TC623CEPA TC623CVOA 8 VCC NC 1 TEMP TO VOLTAGE CONVERTER NOTE: Latch Q Output, ("C" Option), is a Standard Device. Contact Factory for Latch Q Output, ("H" Option). TC623 + LOW SET 2 VREF GEN. PIN CONFIGURATION (DIP and SOIC) 7 LOW LIMIT - NC LOW SET 1 2 3 4 TC623CCOA TC623CEOA TC623CVOA 8 7 6 5 VREF HIGH SET + GND 6 HIGH LIMIT HIGH SET 3 VREF GEN. - 7 NC LOW SET 1 2 3 4 TC623CCPA TC623CEPA 8 7 6 5 VCC LOW LIMIT HIGH LIMIT CONTROL HIGH SET GND R GND 4 S 5 Q CONTROL LATCH RLOW < RHIGH 8 2-25 TC623-5 9/18/96 TELCOM SEMICONDUCTOR, INC. 3V, DUAL TRIP POINT TEMPERATURE SENSOR TC623 ABSOLUTE MAXIMUM RATINGS* Package Power Dissipation (TA 70C) 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 ........................................ - 40C to +125C E Version .......................................... - 40C to +85C C Version ............................................... 0C to +70C Maximum Chip Temperature ................................. +150C Storage Temperature ............................ - 65C to +150C Lead Temperature (Soldering, 10 sec) ................. +300C *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. ELECTRICAL CHARACTERISTICS Parameter Supply Voltage Range Supply Current Absolute Accuracy VOH VOL Hysteresis * Measured at 25C 250 Over Operating Temperature Range) VDD = 2.7V to 4.5V, unless otherwise specified. Conditions 2.7V VDD 4.5V T = Programmed Temperature IOH = 250A IOH = 500A IOL = 500A IOL = 1mA Falling Temperature Min 2.7 -- T-3 0.9 x VDD 0.8 x VDD -- -- -- Typ* -- 150 T 1 -- -- -- -- -- Max 4.5 250 T +3 -- -- 0.1 x VDD 0.2 x VDD -2 Unit V A C V V V V C RESISTANCE (k) 200 150 100 50 -55 creases, the LOW LIMIT is driven high when temperature equals the LOW LIMIT setpoint (3C). If temperature continues to climb, the HIGH LIMIT output is driven high when temperature equals the HIGH LIMIT setpoint (3C). 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 operation. -35 -15 5 25 45 65 85 105 125 TEMPERATURE (C) Figure 1. TC623 Sense Resistors vs. Trip Temperature HIGH SET POINT DETAILED DESCRIPTION TC623 Operation The 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 in2-26 TEMPERATURE LOW SET POINT LOW LIMIT OUTPUT HIGH LIMIT OUTPUT CONTROL OUTPUT (COOL OPTION) Figure 2. TC623 Temperature vs. Output TELCOM SEMICONDUCTOR, INC. 3V, DUAL TRIP POINT TEMPERATURE SENSOR TC623 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 - 2C max. As a result, the HIGH LIMIT and LOW LIMIT outputs remain active until the measured temperature falls a maximum of 2C 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 3C). The output remains active until the temperature falls an additional 2C below the setpoint due to hysteresis. 1 APPLICATIONS 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. 2 3 4 5 6 7 Trip Point Programming The resistance values required for the HIGH SET and LOW SET inputs are calculated using the formula below: PROGRAMMED SETPOINT RTRIP = 0.5997 x T 2.1312 Where Rtrip = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin. -2C HYSTERESIS HIGH LIMIT OR LOW LIMIT OUTPUT For example, to program a trip point of 50C, the programming resistor is: RTRIP = 0.5997 x (50 + 273.15)2.1312) = 133,652 Figure 3. High Set and Low Set Thresholds 8 TELCOM SEMICONDUCTOR, INC. 2-27 |
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