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CC2520 bảng dữ liệu(PDF) 21 Page - Texas Instruments

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tên linh kiện CC2520
Giải thích chi tiết về linh kiện  2.4 GHZ IEEE 802.15.4/ZIGBEE RF TRANSCEIVER
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CC2520 bảng dữ liệu(HTML) 21 Page - Texas Instruments

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CC2520 DATASHEET
2.4 GHZ IEEE 802.15.4/ZIGBEE® RF TRANSCEIVER
SWRS068 – DECEMBER 2007
WWW.TI.COM
21
5.11.1 Using the Temperature Sensor
The on-chip temperature sensor can be accessed via the GPIO0 and GPIO1 pins by following this procedure:
•
Configure GPIO0 and GPIO1 as inputs by writing 0x80 to the GPIOCTRL0 and GPIOCTRL1 registers.
•
Enable analog output functionality for these two pins by setting GPIOCTRL.GPIO_ACTRL=’1’.
•
Select temperature sensor output by writing 0x01 to the ATEST register. This will make GPIO1 output
GND and GPIO0 will output a voltage proportional to the temperature.
•
Use an ADC in the microcontroller to measure the output voltage on GPIO0 and then calculate the
temperature.
The output from the temperature sensor is shown in graph form in section 5.9, but as a basis for calculating
the temperature, the following numbers can be used:
Tc=-40 – 125°C, VDD=1.8 – 3.8 V
Parameter
Min
Typ
Max
Unit
Temp sensor voltage at 25°C
0.8
V
Temp. sens. output vs temperature
25
mV/10°C
Temp. sens. output vs supply voltage
6
mV/V
Temp. sens accuracy no calibration (at fixed voltage)
+/-12
°C
Temp, sens. accuracy with 1-point calibration (at fixed voltage)
+/-1
°C



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