TC623CEOA Microchip

TC623 3V, Dual Trip Point Temperature Sensor Features Package Type Integrated Temp Sensor and Detector Operate SOIC from a Supply Voltage as Low as 2.7V 1 8 V NC CC Replaces Mechanical Thermostats and Switches 2 LOW SET 7 LOW LIMIT TC623CCOA On-Chip Temperature Sense TC623CEOA 3 HIGH SET 6 HIGH LIMIT 8-Pin DIP or SOIC for Direct PCB Mounting TC623CVOA 4 GND 5 CONTROL 2 User Programmable Temperature Set Points 2 Independent Temperature Limit Outputs PDIP Heat/Cool Regulate Output NC 8 V 1 CC Applications LOW SET 2 7 LOW LIMIT TC623CCPA CPU Thermal Management TC623CEPA 3 6 HIGH LIMIT HIGH SET System Over or Under Temperature Shutdown 5 4 CONTROL GND Advanced Thermal Warning Fan Speed Control Circuits General Description Accurate Appliance Temperature Sensing Environmental Control The TC623 is a 3V solid-state, programmable temper- ature sensor designed for use in thermal management Device Selection Table applications. It features dual thermal interrupt outputs (LOW LIMIT and HIGH LIMIT) each of which are set Part Number Package Temp. Range with an external resistor. The HIGH LIMIT and LOW TC623CCOA 8-Pin SOIC 0C to +70C LIMIT outputs are driven active (high) when measured temperature equals the user programmed limits. The TC623CCPA 8-Pin PDIP 0C to +70C CONTROL output is driven active (high) when temper- TC623CEOA 8-Pin SOIC -40C to +85C ature equals the HIGH LIMIT set point and turned off TC623CEPA 8-Pin PDIP -40C to +85C when temperature falls below the LOW LIMIT set point. The CONTROL output can beusedtoprovide simple TC623CVOA 8-Pin SOIC -40C to +125C ON/OFF control to a cooling fan if so desired. NOTE: Latch Output (C option), is a Standard Device. Con- tact Factory for Latch Q Output (H option). Low voltage operation, easy set point programming, small size and low cost make the TC623 an ideal choice for many thermal management applications. Functional Block Diagram 8 1 Temperature V NC CC To Voltage TC623 Converter + 7 LOW LIMIT 2 V REF LOW SET Gen. V REF + 6 HIGH LIMIT 3 V REF HIGH SET Gen. 5 R S CONTROL Q 4 Latch GND R < R LOW HIGH 2002 Microchip Technology Inc. DS21441B-page 1TC623 *Stresses above those listed underAbsolute Maximum Rat- 1.0 ELECTRICAL ing may cause permanent damage to the device. These are CHARACTERISTICS stress ratings only and functional operation of the device at these or any other conditions above those indicated in the Absolute Maximum Ratings* operation sections of the specifications is not implied. Expo- sure to Absolute Maximum Rating conditions for extended Supply Voltage ......................................................5.5V periods may affect device reliability. Input Voltage Any Input ..(GND 0.3V) to (V +0.3V) DD Package Power Dissipation (T 70C) A Plastic DIP.............................................730mW SOIC......................................................470mW Derating Factors Plastic DIP ............................................8mW/C SOIC .....................................................6mW/C Operating Temperature V Version .................................-40C to +125C E Version ...................................-40C to +85C C Version ...................................... 0C to +70C Storage Temperature..........................-65C to +150C TC623 ELECTRICAL SPECIFICATIONS Electrical Characteristics: Over Operating Temperature Range, V = 2.7V to 4.5V, unless otherwise specified. DD Symbol Parameter Min Typ. Max Unit Test Conditions V Supply Voltage Range 2.7 4.5 V DD I Supply Current 150 250 A2.7V V 4.5V DD DD T Absolute Accuracy T - 3 T 1 T + 3 C T = Programmed Temperature SET V Output Voltage High 0.9 x V V I =250 A OH DD OH 0.8 x V V I =500 A DD OH V Output Voltage Low 0.1 x V V I =500 A OL DD OL 0.2 x V V I =1mA DD OL HYS Hysteresis -2 C Falling Temperature DS21441B-page 2 2002 Microchip Technology Inc.