Temperature Sensing and Display
The engineers need a temperature-sensing technology that's inexpensive, accurate and covers an extensive temperature range. They've found the National Semiconductor LM70 SPI digital temperature sensor (www.national.com). For the outdoor temperature display, they've decided to use the Philips Semiconductor I2C SAA1064 four-digit seven-segment LED display driver (www.semiconductors.philips.com).
National Semiconductor's LM70 digital temperature sensor offers 0.25°C resolution over a temperature range of –55°C to +150°C (that is, –67°F to +302°F). The LM70 operates with a supply voltage between +2.65V and +5.5V and consumes 490μA with a temperature accuracy of ±2°C from –40°C to +85°C. It interfaces to microprocessors ...
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