ADC VOLTAGE REFERENCE The VCFG bit of " />
參數(shù)資料
型號： PIC12F683T-E/MF
廠商： Microchip Technology
文件頁數(shù)： 138/176頁
文件大?。?/td> 0K
描述： IC MCU FLASH 2KX14 8DFN
Digi-Key 應(yīng)用說明： AN0005 PWM Example with Microchip's CCP Module
AN0005 Example Code
標準包裝： 3,300
系列： PIC® 12F
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，PWM，WDT
輸入/輸出數(shù)： 5
程序存儲器容量： 3.5KB（2K x 14）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 4x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 125°C
封裝/外殼： 8-VDFN 裸露焊盤
包裝： 帶卷 (TR)
配用： AC164324-ND - MODULE SKT FOR MPLAB 8DFN/16QFN
XLT08DFN2-ND - SOCKET TRANSITION ICE 14DIP/8DFN
AC162058-ND - HEADER MPLAB ICD2 FOR PIC12F683
I3-DB12F683-ND - BOARD DAUGHTER ICEPIC3
XLT08DFN-ND - SOCKET TRANSITION ICE 8DFN
AC164032-ND - ADAPTER PICSTART PLUS 8DFN/DIP
AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC
PIC12F683
DS41211D-page 62
2007 Microchip Technology Inc.
9.1.3
ADC VOLTAGE REFERENCE
The VCFG bit of the ADCON0 register provides control
of the positive voltage reference. The positive voltage
reference can be either VDD or an external voltage
source. The negative voltage reference is always
connected to the ground reference.
9.1.4
CONVERSION CLOCK
The source of the conversion clock is software select-
able via the ADCS bits of the ANSEL register. There
are seven possible clock options:
FOSC/2
FOSC/4
FOSC/8
FOSC/16
FOSC/32
FOSC/64
FRC (dedicated internal oscillator)
The time to complete one bit conversion is defined as
TAD. One full 10-bit conversion requires 11 TAD periods
as shown in Figure 9-2.
For correct conversion, the appropriate TAD specification
must be met. See A/D conversion requirements in
information. Table 9-1 gives examples of appropriate
ADC clock selections.
TABLE 9-1:
ADC CLOCK PERIOD (TAD) VS. DEVICE OPERATING FREQUENCIES (VDD > 3.0V)
FIGURE 9-2:
ANALOG-TO-DIGITAL CONVERSION TAD CYCLES
Note:
Unless using the FRC, any changes in the
system clock frequency will change the
ADC
clock
frequency,
which
may
adversely affect the ADC result.
ADC Clock Period (TAD)
Device Frequency (FOSC)
ADC Clock Source
ADCS<2:0>
20 MHz
8 MHz
4 MHz
1 MHz
FOSC/2
000
100 ns(2)
250 ns(2)
500 ns(2)
2.0
μs
FOSC/4
100
200 ns(2)
500 ns(2)
1.0
μs(2)
4.0
μs
FOSC/8
001
400 ns(2)
1.0
μs(2)
2.0
μs
8.0
μs(3)
FOSC/16
101
800 ns(2)
2.0
μs4.0 μs
16.0
μs(3)
FOSC/32
010
1.6
μs4.0 μs
8.0
μs(3)
32.0
μs(3)
FOSC/64
110
3.2
μs
8.0
μs(3)
16.0
μs(3)
64.0
μs(3)
FRC
x11
2-6
μs(1,4)
2-6
μs(1,4)
2-6
μs(1,4)
2-6
μs(1,4)
Legend: Shaded cells are outside of recommended range.
Note 1:
The FRC source has a typical TAD time of 4
μs for VDD > 3.0V.
2:
These values violate the minimum required TAD time.
3:
For faster conversion times, the selection of another clock source is recommended.
4:
When the device frequency is greater than 1 MHz, the FRC clock source is only recommended if the
conversion will be performed during Sleep.
TAD1 TAD2 TAD3 TAD4 TAD5 TAD6 TAD7 TAD8 TAD9
Set GO/DONE bit
Holding Capacitor is Disconnected from Analog Input (typically 100 ns)
b9
b8
b7
b6
b5
b4
b3
b2
TAD10 TAD11
b1
b0
TCY to TAD
Conversion Starts
ADRESH and ADRESL registers are loaded,
GO bit is cleared,
ADIF bit is set,
Holding capacitor is connected to analog input
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參數(shù)描述
PIC12F683T-I/MD 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 6I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC12F683T-I/MDQTP 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
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