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TC72-2.8MUA Datasheet(PDF) 11 Page - Microchip Technology |
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TC72-2.8MUA Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 28 page  © 2011 Microchip Technology Inc. DS21743B-page 11 TC72 4.0 FUNCTIONAL DESCRIPTION TC72 consists of a band-gap type temperature sensor, a 10-bit Sigma Delta Analog-to-Digital Converter (ADC), an internal conversion oscillator and a double buffer digital output port. The 10-bit ADC is scaled from -128°C to +127°C; therefore, the resolution is 0.25°C per bit. The ambient temperature operating range of the TC72 is specified from -55°C to +125°C. This device features a four-wire serial interface that is fully compatible with the SPI specification and, there- fore, allows simple communications with common microcontrollers and processors. TC72 can be used either in a Continuous Temperature Conversion mode or a One-Shot Conversion mode. TC72 temperature measurements are performed in the background and, therefore, reading the temperature via the serial I/O lines does not affect the measurement in progress. The Continuous Conversion mode measures the temperature approximately every 150 ms and stores the data in the temperature registers. TC72 has an internal clock generator that controls the automatic temperature conversion sequence. The automatic temperature sampling operation is repeated indefinitely until TC72 is placed in Shutdown mode by a write operation to the Control register. TC72 will remain in Shutdown mode until the shutdown bit in the Control register is reset. In contrast, the One-Shot mode performs a single temperature measurement and returns to the power- saving shut down mode. This mode is especially useful for low power applications. FIGURE 4-1: Temperature-To-Digital Transfer Function (Non-Linear Scale). Temp Temp Output Code +125°C -55°C +25°C -25°C +0.25°C -0.125°C 0111 1101 / 0000 0000 MSB LSB Note: The ADC converter is scaled from -128°C to +127°C, but the operating range of the TC72 is specified from -55°C to +125°C. 0001 1001 / 0000 0000 MSB LSB 0000 0000 / 0100 0000 MSB LSB 0000 0000 / 0000 0000 MSB LSB 1111 1111 / 1100 0000 MSB LSB 1110 0111 / 0000 0000 MSB LSB 1100 1001 / 0000 0000 MSB LSB 0°C |
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