Details, datasheet, quote on part number: TC74
PartTC74
CategorySensors => Temperature Sensors
DescriptionThe TC74 is a Serially Accessible Digital Temperature Sensor Particularly Suited For Low Cost And Small Form-factor Applications
CompanyMicrochip Technology, Inc.
DatasheetDownload TC74 datasheet
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Features, Applications
Features

Digital Temperature Sensing or TO-220 Packages Outputs Temperature an 8-Bit Digital Word Simple SMBus/I2CTM Serial Port Interface Solid-State Temperature Sensing: - 2C (max.) Accuracy from - 3C (max.) Accuracy from to +125C Supply Voltage to 5.5V Low Power: 200 A (typ.) Operating Current 5 A (typ.) Standby Mode Current

The is a serially accessible, digital temperature sensor particularly suited for low cost and small formfactor applications. Temperature data is converted from the onboard thermal sensing element and made available an 8-bit digital word. Communication with the TC74 is accomplished via 2wire SMBus/I2C compatible serial port. This bus also can be used to implement multi-drop/multi-zone monitoring. The SHDN bit in the CONFIG register can be used to activate the low power Standby mode. Temperature resolution is 1C. Conversion rate is a nominal 8 samples/sec. During normal operation, the quiescent current 200 A (typ). During standby operation, the quiescent current 5 A (typ). Small size, low installed cost and ease of use make the TC74 an ideal choice for implementing thermal management in a variety of systems.

Applications

Thermal Protection for Hard Disk Drives and other PC Peripherals PC Card Devices for Notebook Computers Low Cost Thermostat Controls Power Supplies Thermistor Replacement

Supply Voltage (VDD)............................................ +6V Voltage On Any Pin....... (GND 0.3V) to (VDD + 0.3V) Current On Any Pin.......................................... 50 mA Operating Temperature (TA)........ TA +125C Storage Temperature (TSTG).............. to +150C Junction Temperature (TJ)................................ +150C

Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.

Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and VDD = 5.0V for TA 125C. Note 5 Parameters Power Supply Power-on Reset Threshold Supply Voltage Operating Current Standby Supply Current Temperature-to-Bits Converter Temperature Accuracy TERR x VDD C +25C <TA < 0C Note 2 VPOR VDD IDD IDD-STANDBY V A VDD Falling Edge or Rising Edge Note 5 VDD = 5.5V, Note 1 VDD = 3.3V Serial Port Inactive, Note 4 Sym Min Typ Max Units Conditions

Conversion Rate Serial Port Interface Logic Input High Logic Input Low SDA Output Low Input Capacitance SDA, SCLK I/O Leakage SMBus/I2C Clock Frequency Low Clock Period High Clock Period

Note 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. 2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. 3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. 4: SDA and SCLK must be connected to VDD or GND. 5: VDD = 3.3V for TC74AX -3.3 VXX. VDD = 5.0V for TC74AX -5.0 VXX. All part types of the TC74 will operate properly over the wider power supply range to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade V DD change.

Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and VDD = 5.0V for TA 125C. Note 5 Parameters SMBus/I C Rise Time SMBus/I2C Fall Time START Condition Setup Time (for repeated START Condition) START Condition Hold Time Data In Setup Time Data In Hold Time STOP Condition Setup Time Bus Free Time Prior to New Transition Power-on Reset Delay

tH(START) tSU-DATA tH-DAT tSU(STOP) tIDLE tPOR
sec nsec sec VDD VPOR (Rising Edge)

Note 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. 2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. 3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. 4: SDA and SCLK must be connected to VDD or GND. 5: VDD = 3.3V for TC74AX -3.3 VXX. VDD = 5.0V for TC74AX -5.0 VXX. All part types of the TC74 will operate properly over the wider power supply range to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade V DD change.


 

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