參數(shù)資料
型號: PIC16F630-I/ST
廠商: Microchip Technology
文件頁數(shù): 73/132頁
文件大?。?/td> 0K
描述: IC MCU FLASH 1KX14 EEPROM14TSSOP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 96
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,WDT
輸入/輸出數(shù): 12
程序存儲器容量: 1.75KB(1K x 14)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 128 x 8
RAM 容量: 64 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 14-TSSOP(0.173",4.40mm 寬)
包裝: 管件
產(chǎn)品目錄頁面: 638 (CN2011-ZH PDF)
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.
2.
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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