TC72 查看數據表（PDF） - Microchip Technology

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TC72

Digital Temperature Sensor with SPI™ Interface

Microchip Technology 

TC72

3.0 FUNCTIONAL DESCRIPTION

The TC72 consists of a band-gap type temperature

sensor, a 10-bit Sigma Delta Analog-to-Digital Con-

verter (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. The TC72 can be

used either in a Continuous Temperature Conversion

mode or a One-Shot Conversion mode. The TC72 tem-

perature measurements are performed in the back-

ground and, therefore, reading the temperature via the

serial I/O lines does not affect the measurement in

progress.

The Continuous Conversion mode measures the tem-

perature approximately every 150 ms and stores the

data in the temperature registers. The TC72 has an

internal clock generator that controls the automatic

temperature conversion sequence. The automatic tem-

perature sampling operation is repeated indefinitely

until the TC72 is placed in a shutdown mode by a write

operation to the Control register. The TC72 will remain

in the shutdown mode until the shutdown bit in the

Control register is reset.

In contrast, the One-Shot mode performs a single tem-

perature measurement and returns to the power-sav-

ing shut down mode. This mode is especially useful for

low power applications.

Temp

-55°C

Output

Code

MSB

LSB

0111 1101 / 0000 0000

+25°C

+0.25°C

MSB

LSB

0001 1001 / 0000 0000

MSB

LSB

0000 0000 / 0100 0000

MSB

LSB

0°C

0000 0000 / 0000 0000

MSB

LSB

1111 1111 / 1100 0000

MSB

LSB

1110 0111 / 0000 0000

-0.125°C

-25°C

Temp

+125°C

MSB

LSB

1100 1001 / 0000 0000

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.

FIGURE 3-1:

Temperature-To-Digital Transfer Function (Non-linear Scale).

DS21743A-page 8

 2002 Microchip Technology Inc.

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