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TC74A3-5.0VAT Datenblatt(PDF) 1 Page - Microchip Technology |
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TC74A3-5.0VAT Datenblatt(HTML) 1 Page - Microchip Technology |
1 / 18 page 2001-2012 Microchip Technology Inc. DS21462D-page 1 TC74 Features • Digital Temperature Sensing in SOT-23-5 or TO-220 Packages • Outputs Temperature as an 8-Bit Digital Word • Simple SMBus/I2C™ Serial Port Interface • Solid-State Temperature Sensing: - ±2°C (max.) Accuracy from +25°C to +85°C - ±3°C (max.) Accuracy from 0°C to +125°C • Supply Voltage of 2.7V to 5.5V •Low Power: - 200 µA (typ.) Operating Current - 5 µA (typ.) Standby Mode Current 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 Package Types General Description The TC74 is a serially accessible, digital temperature sensor particularly suited for low cost and small form- factor applications. Temperature data is converted from the onboard thermal sensing element and made available as an 8-bit digital word. Communication with the TC74 is accomplished via a 2- wire 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 1°C. Conversion rate is a nominal 8 samples/sec. During normal operation, the quiescent current is 200 µA (typ). During standby operation, the quiescent current is 5 µA (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. Functional Block Diagram TO-220 SOT-23 VDD GND 12 NC 5 4 SDA SCLK TC74 3 1 23 4 5 TC74 Note: The TO-220 tab is connected to pin 3 (GND) Internal Sensor (Diode) Modulator Temperature Register Serial Port Interface Control Logic SDA SCLK Tiny Serial Digital Thermal Sensor |
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