|Category||Automotive => Sensor Interface|
|Description||Tiny Serial Digital Thermal Sensor|
|Company||Microchip Technology, Inc.|
|Datasheet||Download TC74A0-33VAT datasheet
Digital Temperature Sensing in SOT-23-5 Package Outputs Temperature an 8-Bit Digital Word Simple Serial Port Interface Solid-State Temperature Sensing: - ±2°C Accuracy from - ±3°C Accuracy from +125°C 3.0 and 5.5V Operating Range Low Power: - 200µA Operating - 5µA Standby Mode
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/I2CTM 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 1°C. Conversion rate is a nominal 8 samples/sec. Power consumption is only 200µA typ, (5µA Standby, 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
*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.
Supply Voltage (V DD)............................................ +6V Voltage On Any Pin....... (GND 0.3V) to (VDD + 0.3V) Current On Any Pin.......................................... ±50 mA Operating Temperature (TA)........................ See Below Storage Temperature (TSTG).............. to +150°C
Electrical Characteristics: VDD or 5.0V (Note TA 125°C, unless otherwise noted. Symbol Power Supply VPOR IDD IDD-STANDBY Power-on Reset Threshold Operating Current Standby Supply Current V µA VDD Falling Edge or Rising Edge VDD = 5.5V Serial Port Inactive (Note 1) VDD = 3.3V Serial Port Inactive (Note 1) +25°C <TA < 0°C (Note 2) Parameter Min Typ. Max Unit Test ConditionsTemperature to Bits Converter TERR Temperature Accuracy TC74A x VDD x VDD 1 °C
Conversion Rate Logic Input High Logic Input Low SDA Output Low Input Capacitance SDA, SCL I/O Leakage
Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. SDA and SCLK must be connected to VDD or GND. VDD = 3.3V for TC74X -3.3VCT. VDD = 5.0V for TC74X -5.0VCT. 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 1°C/V of VDD change.
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