參數(shù)資料
型號： PIC16F872T-I/SO
廠商： Microchip Technology
文件頁數(shù)： 32/167頁
文件大?。?/td> 0K
描述： IC MCU FLASH 2KX14 EE 28SOIC
產(chǎn)品培訓模塊： Asynchronous Stimulus
標準包裝： 1,600
系列： PIC® 16F
核心處理器： PIC
芯體尺寸： 8-位
速度： 20MHz
連通性： I²C，SPI
外圍設(shè)備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 22
程序存儲器容量： 3.5KB（2K x 14）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 64 x 8
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 5x10b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
包裝： 帶卷 (TR)
128
8048C–AVR–02/12
ATtiny43U
perature sensor is enabled, the ADC converter can be used in single conversion mode to
measure the voltage over the temperature sensor.
The measured voltage has a linear relationship to the temperature as described in Table 16-2
The sensitivity is approximately 1 LSB / °C and the accuracy depends on the method of user cal-
ibration. Typically, the measurement accuracy after a single temperature calibration is ±10°C,
assuming calibration at room temperature. Better accuracies are achieved by using two
temperature points for calibration.
The values described in Table 16-2 are typical values. However, due to process variation the
temperature sensor output voltage varies from one chip to another. To be capable of achieving
more accurate results the temperature measurement can be calibrated in the application soft-
ware. The sofware calibration can be done using the formula:
T = k * [(ADCH << 8) | ADCL] + T
OS
where ADCH and ADCL are the ADC data registers, k is the fixed slope coefficient and T
OS is
the temperature sensor offset. Typically, k is very close to 1.0 and in single-point calibration the
coefficient may be omitted. Where higher accuracy is required the slope coefficient should be
evaluated based on measurements at two temperatures.
16.13 Register Description
16.13.1
ADMUX – ADC Multiplexer Selection Register
Bit 7 – Res: Reserved Bit
This bit is reserved and must always be written zero.
Bit 6 – REFS: Reference Selection Bit
This bit selects the voltage reference for the ADC, as shown in Table 16-3 on page 128. If this bit
is changed during a conversion, the change will not go in effect until this conversion is complete
(ADIF in ADCSR is set).
Bits 5:3 – Res: Reserved Bits
These bits are reserved and will always read zero.
Table 16-2.
Temperature vs. Sensor Output Voltage (Typical Case)
Temperature
-40
°C+25 °C+85 °C
ADC
230 LSB
300 LSB
370 LSB
Bit
765
432
10
–
REFS
–––
MUX2
MUX1
MUX0
ADMUX
Read/Write
R
R/W
R
R/W
Initial Value
0
Table 16-3.
Voltage Reference Selections for ADC
REFS
Voltage Reference Selection
0VCC used as analog reference.
1
Internal 1.1V Voltage Reference.
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