參數(shù)資料
型號： PIC16F785
廠商： Microchip Technology Inc.
英文描述： 20-Pin Flash-Based 8-Bit CMOS Microcontroller with Two-Phase Asychronous Feedback PWM, Dual High-Speed Comparators and Dual Operational Amplifiers
中文描述： 20引腳基于閃存的8兩相異步反饋的PWM，雙高位CMOS微控制器的高速比較器和雙運算放大器
文件頁數(shù)： 80/178頁
文件大?。?/td> 1620K
代理商： PIC16F785
PIC16F785
DS41249A-page 78
Preliminary
2004 Microchip Technology Inc.
12.1
A/D Configuration and Operation
There are four registers available to control the
functionality of the A/D module:
1.
2.
3.
4.
ANSEL0 (Register 12-1)
ANSEL1 (Register 12-2)
ADCON0 (Register 12-3)
ADCON1 (Register 12-4)
12.1.1
ANALOG PORT PINS
The
ANSEL0<7:0>) and the TRISA<4,2:0>, TRISB<5:4>
and TRISC<7:6,3:0>> bits control the operation of the
A/D port pins. Set the corresponding TRISx bits to ‘
1
’ to
set the pin output driver to its high-impedance state.
Likewise, set the corresponding ANSx bit to disable the
digital input buffer.
ANS<11:0>
bits
(ANSEL1<3:0>
and
12.1.2
CHANNEL SELECTION
There are fourteen analog channels on the PIC16F785.
The CHS<3:0> bits (ADCON0<5:2>) control which
channel is connected to the sample and hold circuit.
12.1.3
VOLTAGE REFERENCE
There are two options for the voltage reference to the
A/D converter: either V
DD
is used or an analog voltage
applied to V
REF
is used. The VCFG bit (ADCON0<6>)
controls the voltage reference selection. If VCFG is set,
then the voltage on the V
REF
pin is the reference;
otherwise, V
DD
is the reference.
12.1.4
CONVERSION CLOCK
The A/D conversion cycle requires 11 T
AD
. The source
of the conversion clock is software selectable via the
ADCS bits (ADCON1<6:4>). There are seven possible
clock options:
F
OSC
/2
F
OSC
/4
F
OSC
/8
F
OSC
/16
F
OSC
/32
F
OSC
/64
F
RC
(dedicated internal oscillator)
For correct conversion, the A/D conversion clock
(1/T
AD
) must be selected to ensure a minimum T
AD
of
1.6 μs. Table 12-1 shows a few T
AD
calculations for
selected frequencies.
TABLE 12-1:
T
AD
VS. DEVICE OPERATING FREQUENCIES
Note:
Analog voltages on any pin that is defined
as a digital input may cause the input
buffer to conduct excess current.
A/D Clock Source (T
AD
)
Operation
2 T
OSC
4 T
OSC
8 T
OSC
16 T
OSC
32 T
OSC
64 T
OSC
A/D RC
Legend:
Shaded cells are outside of recommended range.
Note 1:
The A/D RC source has a typical T
AD
time of 4 μs for V
DD
> 3.0V.
2:
These values violate the minimum required T
AD
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 A/D RC clock source is only recommended if the
conversion will be performed during Sleep.
Device Frequency
5 MHz
400 ns
(2)
800 ns
(2)
1.6 μs
3.2 μs
6.4 μs
12.8 μs
(3)
2–6 μs
(1,4)
ADCS2:ADCS0
000
100
001
101
010
110
x11
20 MHz
100 ns
(2)
200 ns
(2)
400 ns
(2)
800 ns
(2)
1.6 μs
3.2 μs
2–6 μs
(1,4)
4 MHz
500 ns
(2)
1.0 μs
(2)
2.0 μs
4.0 μs
8.0 μs
(3)
16.0 μs
(3)
2–6 μs
(1,4)
1.25 MHz
1.6 μs
3.2 μs
6.4 μs
12.8 μs
(3)
25.6 μs
(3)
51.2 μs
(3)
2–6 μs
(1,4)
相關PDF資料
PDF描述
PIC16F818 18/20-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology(18/20引腳，納瓦技術增強FLASH微控制器)
PIC16F819 18/20-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology(18/20引腳，納瓦技術增強FLASH微控制器)
PIC16F83 8-Bit CMOS Flash/EEPROM Microcontollrs(每個I/O口有20mA吸收,25mA驅(qū)動，64字節(jié)數(shù)據(jù)EEPROM，2.0V的微控制器)
PIC16F84 18-pin Flash/EEPROM 8-Bit Microcontrollers
PIC16F85 18/20 Pin, 8-Bit CMOS FLASH Microcontroller with Comparators and A/D Product Brief
相關代理商/技術參數(shù)
參數(shù)描述
PIC16F785-E/ML 功能描述:8位微控制器 -MCU 3.5 KB 128 RAM 18I/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
PIC16F785-E/P 功能描述:8位微控制器 -MCU 14KB 368 RAM 33 I/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
PIC16F785-E/SO 功能描述:8位微控制器 -MCU 3.5KB FL 128R 18 I/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
PIC16F785-E/SS 功能描述:8位微控制器 -MCU 3.5KB FL 128R 18 I/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
PIC16F785-I/ML 功能描述:8位微控制器 -MCU 3.5 KB 128 RAM 18I/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
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*