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参数资料
型号： PIC16F676-E/SL
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO14
封装： 3.90 MM, LEAD FREE, PLASTIC, SOIC-14
文件页数： 73/132页
文件大小： 1344K
代理商： PIC16F676-E/SL
2010 Microchip Technology Inc.
DS40039F-page 45
PIC16F630/676
7.0
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
(PIC16F676 ONLY)
The Analog-to-Digital Converter (ADC) allows conver-
sion of an analog input signal to a 10-bit binary repre-
sentation of that signal. The PIC16F676 has eight
analog inputs, multiplexed into one sample and hold
circuit. The output of the sample and hold is connected
to the input of the converter. The converter generates a
binary result via successive approximation and stores
the result in a 10-bit register. The voltage reference
used in the conversion is software selectable to either
VDD or a voltage applied by the VREF pin. Figure 7-1
shows the block diagram of the A/D on the PIC16F676.
FIGURE 7-1:
A/D BLOCK DIAGRAM
7.1
A/D Configuration and Operation
There are three registers available to control the
functionality of the A/D module:
1.
ADCON0 (Register 7-1)
2.
ADCON1 (Register 7-2)
3.
ANSEL (Register 7-3)
7.1.1
ANALOG PORT PINS
The ANS7:ANS0 bits (ANSEL<7:0>) and the TRISA
bits control the operation of the A/D port pins. Set the
corresponding TRISA bits to set the pin output driver to
its high-impedance state. Likewise, set the correspond-
ing ANS bit to disable the digital input buffer.
7.1.2
CHANNEL SELECTION
There are eight analog channels on the PIC16F676,
AN0
through
AN7.
The
CHS2:CHS0
bits
(ADCON0<4:2>) control which channel is connected to
the sample and hold circuit.
7.1.3
VOLTAGE REFERENCE
There are two options for the voltage reference to the
A/D converter: either VDD is used, or an analog voltage
applied to VREF is used. The VCFG bit (ADCON0<6>)
controls the voltage reference selection. If VCFG is set,
then the voltage on the VREF pin is the reference;
otherwise, VDD is the reference.
7.1.4
CONVERSION CLOCK
The A/D conversion cycle requires 11 TAD. The source
of the conversion clock is software selectable via the
ADCS bits (ADCON1<6:4>). There are seven possible
clock options:
FOSC/2
FOSC/4
FOSC/8
FOSC/16
FOSC/32
FOSC/64
FRC (dedicated internal oscillator)
For correct conversion, the A/D conversion clock
(1/TAD) must be selected to ensure a minimum TAD of
1.6
s. Table 7-1 shows a few TAD calculations for
selected frequencies.
RA0/AN0
ADC
RA1/AN1/VREF
RA2/AN2
RC0/AN4
VDD
VREF
ADON
GO/DONE
VCFG = 1
VCFG = 0
CHS2:CHS0
ADRESH ADRESL
10
ADFM
VSS
RC1/AN5
RC2/AN6
RC3/AN7
RA4/AN3
Note:
Analog voltages on any pin that is defined
as a digital input may cause the input
buffer to conduct excess current.
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相关代理商/技术参数
参数描述
PIC16F676-I/ML 功能描述:8位微控制器 -MCU 1.75 KB 64 RAM 12I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F676-I/P 功能描述:8位微控制器 -MCU 1.75KB 64 RAM 12 I/O Ind Temp PDIP14 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F676-I/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 16F676 DIP14
PIC16F676-I/SL 功能描述:8位微控制器 -MCU 1.75KB 64 RAM 12 I/O Ind Temp SOIC14 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F676-I/SL 制造商:Microchip Technology Inc 功能描述:8BIT FLASH MCU SMD 16F676 SOIC14
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