tc72-5.0mmf Microchip Technology Inc., tc72-5.0mmf Datasheet - Page 8

• Manufacturer Part Number: tc72-5.0mmf
• Description: Digital Temperature Sensor With Spi? Interface
• Manufacturer: Microchip Technology Inc.

TC72
3.0
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.
FIGURE 3-1:
DS21743A-page 8
Temp
-55°C
FUNCTIONAL DESCRIPTION
Note:
0000 0000 / 0000 0000
Temperature-To-Digital Transfer Function (Non-linear Scale).
MSB
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.
0111 1101 / 0000 0000
0001 1001 / 0000 0000
0000 0000 / 0100 0000
MSB
MSB
MSB
LSB
-25°C
LSB
LSB
LSB
-0.125°C
0°C
Output
Code
+0.25°C
1111 1111 / 1100 0000
1110 0111 / 0000 0000
1100 1001 / 0000 0000
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.
MSB
MSB
MSB
+25°C
LSB
LSB
LSB
2002 Microchip Technology Inc.
+125°C
Temp