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TC72-5.0MMFTR 数据表(PDF) 11 Page - Microchip Technology

部件名 TC72-5.0MMFTR
功能描述  Digital Temperature Sensor with SPI Interface
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

TC72-5.0MMFTR 数据表(HTML) 11 Page - Microchip Technology

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© 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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