1 TC622 TC624 LOW COST, SINGLE TRIP POINT TEMPERATURE SENSOR FEATURES ■ ■ ■ ■ Temperature Set Point Easily Programs with a Single External Resistor Operates with 2.7V Power Supply (TC624) TO-220 Package for Direct Mounting to Heatsink (TC622xAT) or Standard 8-Pin PDIP and SOIC Cost Effective APPLICATIONS ■ ■ ■ ■ ■ Power Supply Over-temperature Detection Consumer Electronics Fire/ Heat Detection UPS's, Amplifiers, Motors CPU Thermal Management in PC's The TC622 has a power supply voltage range of 4.5V to 18.0V while the TC624 operates over a power supply range of 2.7V to 4.5V. Both devices are usable over a temperature range of – 40°C to +125°C (TC622Vxx, TC624Vxx). Both devices feature low supply current making them suitable for many portable applications. Eight-pin through-hole and surface mount packages are available. The TC622 is also offered in a 5-pin TO-220 package. 3 FUNCTIONAL BLOCK DIAGRAM TEMP SENSOR 4 TEMPERATURE TO VOLTAGE CONVERTER GENERAL DESCRIPTION 2 The TC622 and TC624 are programmable solid state temperature switches designed to replace mechanical switches in sensing and control applications. Both devices integrate the temperature sensor along with a voltage reference and all required detector circuitry to form a stand-alone temperature switch. The desired temperature set point is set by the user with a single external resistor. Ambient temperature is sensed and compared to the programmed setpoint. The OUT and OUT outputs are driven to their active state when the measured temperature exceeds the programmed setpoint. OUT OUT VOLTAGE REFERENCE GENERATOR TSET VDD 5 GND 6 ORDERING INFORMATION Part No. Voltage Operation Package Ambient Temperature TC622COA TC622CPA TC622EAT TC622EOA TC622EPA TC622VAT TC622VOA TC622VPA TC624COA TC624CPA TC624EOA TC624EPA TC624VOA TC624VPA 4.5V 4.5V 4.5V 4.5V 4.5V 4.5V 4.5V 4.5V 2.7V 2.7V 2.7V 2.7V 2.7V 2.7V 8-Pin SOIC 8-Pin Plastic DIP 5-Pin TO-220 8-Pin SOIC 8-Pin Plastic DIP 5-Pin TO-220 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIP 0°C to +70°C 0°C to +70°C – 40°C to +85°C – 40°C to +85°C – 40°C to +85°C – 40°C to +125°C – 40°C to +125°C – 40°C to +125°C 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 – 40°C to +125°C to 18V to 18V to 18V to 18V to 18V to 18V to 18V to 18V to 4.5V to 4.5V to 4.5V to 4.5V to 4.5V to 4.5V TC622/24-4 TELCOM SEMICONDUCTOR, INC. 7 8 9/25/96 2-21 LOW COST, SINGLE TRIP POINT TEMPERATURE SENSOR TC622 TC624 ABSOLUTE MAXIMUM RATINGS* Supply Voltage (TC622) .............................................20V (TC624) ........................................... 5.5V Input Voltage Any Input ....... (GND – 0.3V) to (VDD +0.3V) Operating Temperature ......................... – 40°C to +125°C C Version ............................................... 0°C to +70°C E Version .......................................... – 40°C to +85°C V Version ........................................ – 40°C to +125°C Maximum Junction Temperature ........................... +150°C Storage Temperature ............................ – 65°C to +150°C Lead Temperature (Soldering, 10 sec) ................. +300°C *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 (Over Operating Temperature Range, unless otherwise specified.) Parameter Supply Voltage Range Supply Current VOH VOL Conditions TC622 TC624 TC622 TC624 TC622 TC622 VOH TC624 VOL TC624 Absolute Accuracy Trip Point Hysteresis TC622 TC624 TC622 TC624 5.0V ≤ VDD ≤ 18V 2.7V ≤ VDD ≤ 4.5V 5.0V ≤ VDD ≤ 18V, – 40°C ≤ TA ≤ +125°C, IOH = 250µA IOH = 500µA – 40°C ≤ TA ≤ +85°C, IOL = 500µA IOL = 1mA – 40°C ≤ TA ≤ +125°C, IOL = 1mA 2.7V ≤ VDD ≤ 4.5V, – 40°C ≤ TA ≤ +125°C, IOH = 250µA IOH = 500µA – 40°C ≤ TA ≤ +85°C, IOL = 500µA IOL = 1mA – 40°C ≤ TA ≤ +125°C, IOL = 1mA TSET = Programmed Temperature TSET = Programmed Temperature Min Typ Max Unit 4.5 2.7 — — — V 200 170 18 4.5 600 300 — — — — — — — 0.15 x VDD 0.30 x VDD 0.35 x VDD — — — — — T±1 T±1 2 2 — — 0.1 x VDD 0.2 x VDD 0.25 x VDD T+5 T+5 — — 0.90 x VDD 0.80 x VDD — — — 0.9 x VDD 0.8 x VDD — — — T–5 T–5 — — µA V V V V °C °C DETAILED DESCRIPTION The TC622 and TC624 are single point temperature detectors ideal for use in a wide variety of applications. When the temperature of the device exceeds the programmed temperature trip point, TSET, the OUT and OUT outputs are driven into their active states. The desired trippoint temperature is programmed with a single external resistor connected between the TSET input and VCC. The relationship between the resistor value and the trip point temperature is given by the equation below. For example, to program the device to trip at 50°C, the programming resistor is: RTRIP = 0.5997 x ((50 + 273.15)2.1312) = 133,652 Ω RTRIP = 0.5997 x T 2.1312 Where Rtrip = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin. 2-22 TELCOM SEMICONDUCTOR, INC. LOW COST, SINGLE TRIP POINT TEMPERATURE SENSOR 1 TC622 TC624 Hysteresis TEMPERATURE To prevent output "chattering" at the trip point temperature, the temperature detector in the TC622/624 has 2°C of hysteresis (See Figure 1). The outputs are driven active when the temperature crosses the setpoint determined by the external resistor. As temperature declines below the setpoint, the hysteresis action will hold the outputs true until the temperature drops 2°C below the threshold. 2 SET POINT (SET POINT - 2 DEGREE C) OUT 3 OUT Figure 1. TC622/624 Hysteresis PIN CONFIGURATIONS 1 8 NC OUT 2 7 VDD 6 NC 5 TSET OUT 3 GND 4 NC 1 8 NC OUT 2 7 VDD OUT 3 GND 4 8-Pin DIP 6 NC 5 TSET 8-Pin SOIC NC 1 8 NC OUT 2 7 VDD OUT 3 6 NC GND 4 TC624CPA TC624EPA TC624VPA TC622COA TC622EOA TC622VOA 5 TSET NC 1 OUT 2 OUT 3 GND 4 TC624COA TC624EOA TC624VOA 4 TC622EAT TC622VAT 1 2 3 4 5 8 NC 7 VDD 6 NC 5 TSET 5 GND TSET NC TC622CPA TC622EPA TC622VPA 5-Pin TO-220 8-Pin SOIC OUT OUT VDD 8-Pin DIP NOTE: For TO-220 Package, Pin 3 is connected to case heatsink. 6 7 8 TELCOM SEMICONDUCTOR, INC. 2-23