TC77
DS20092A-page 8
?2002 Microchip Technology Inc.
3.0
FUNCTIONAL DESCRIPTION
The TC77 consists of a band-gap type temperature
sensor, a 12-bit plus sign (13-bit) Sigma-Delta Analog-
to-Digital Converter (ADC), an internal conversion
oscillator (~30 kHz) and a serial input/output port.
These devices feature a three-wire serial interface that
is fully compatible with SPI and MICROWIRE specifica-
tions and, therefore, allows simple communications
with common microcontrollers and processors. The
Shutdown mode can be used to reduce supply current
for power sensitive applications. A Manufacturers ID
register identifies the TC77 as a Microchip Technology
product.
FIGURE 3-1:
Temperature To Digital Transfer Function (Non-linear Scale).
Temp
Temp
Output
Code
+125癈
-55癈
+25癈
-25癈
+0.0625癈
-0.0625癈
0+0111 1101 0000
0+0001 1001 0000
0+0000 0000 0001
0+0000 0000 0000
1+1111 1111 1111
1+1110 0111 0000
1+1100 1001 0000
0癈
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