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參數(shù)資料
| 型號(hào)： | PIC18F4553 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 28/40/44-Pin High-Performance, Enhanced Flash, USB Microcontrollers with 12-Bit A/D and nanoWatt Technology |
| 中文描述： | 28/40/44-Pin高性能，增強(qiáng)型閃存，USB微控制器與12位A / D和納瓦技術(shù) |
| 文件頁(yè)數(shù)： | 25/46頁(yè) |
| 文件大?。?/td> | 607K |
| 代理商： | PIC18F4553 |
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2007 Microchip Technology Inc.
Preliminary
DS39887B-page 23
PIC18F2458/2553/4458/4553
The value in the ADRESH:ADRESL registers is
unknown following Power-on and Brown-out Resets,
and is not affected by any other Reset.
After the A/D module has been configured as desired,
the selected channel must be acquired before the
conversion is started. The analog input channels must
have their corresponding TRIS bits selected as an
input. To determine acquisition time, see
Section 2.1
“A/D Acquisition Requirements”
. After this acquisi-
tion time has elapsed, the A/D conversion can be
started. An acquisition time can be programmed to
occur between setting the GO/DONE bit and the actual
start of the conversion.
The following steps should be followed to perform an A/D
conversion:
1.
Configure the A/D module:
Configure analog pins, voltage reference and
digital I/O (ADCON1)
Select A/D input channel (ADCON0)
Select A/D acquisition time (ADCON2)
Select A/D conversion clock (ADCON2)
Turn on A/D module (ADCON0)
Configure A/D interrupt (if desired):
Clear ADIF bit
Set ADIE bit
Set GIE bit
Wait the required acquisition time (if required).
Start conversion:
Set GO/DONE bit (ADCON0 register)
2.
3.
4.
5.
Wait for A/D conversion to complete, by either:
Polling for the GO/DONE bit to be cleared
OR
Waiting for the A/D interrupt
Read A/D Result registers (ADRESH:ADRESL);
clear bit ADIF, if required.
For next conversion, go to step 1 or step 2, as
required. The A/D conversion time per bit is
defined as T
AD
. A minimum wait of 2 T
AD
is
required before the next acquisition starts.
6.
7.
FIGURE 2-2:
A/D TRANSFER FUNCTION
FIGURE 2-3:
ANALOG INPUT MODEL
D
FFEh
003h
002h
001h
000h
0
1
1
2
2
4
4
3
Analog Input Voltage
FFFh
4
4
V
AIN
C
PIN
5 pF
Rs
ANx
V
T
= 0.6V
V
T
= 0.6V
I
LEAKAGE
±100 nA
R
IC
≤
1k
Sampling
Switch
SS
R
SS
C
HOLD
= 25 pF
V
SS
V
DD
Legend:
C
PIN
V
T
I
LEAKAGE
R
IC
SS
C
HOLD
R
SS
= Input Capacitance
= Threshold Voltage
= Leakage Current at the pin due to
various junctions
= Interconnect Resistance
= Sampling Switch
= Sample/Hold Capacitance (from DAC)
= Sampling Switch Resistance
V
DD
6V
5V
4V
3V
2V
Sampling Switch
1
2
3
4
(k
Ω
)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC18F4553-I/ML | 功能描述:8位微控制器 -MCU 32KB FLSH 2048 RAM FSUSB 2.0 12B ADC 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| PIC18F4553-I/P | 功能描述:8位微控制器 -MCU 32KB FLSH 2048 RAM FSUSB 2.0 12B ADC 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| PIC18F4553-I/P | 制造商:Microchip Technology Inc 功能描述:8-Bit Microcontroller IC |
| PIC18F4553-I/PT | 功能描述:8位微控制器 -MCU 32KB FLSH 2048 RAM FSUSB 2.0 12B ADC 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| PIC18F4553T-I/ML | 功能描述:8位微控制器 -MCU 32KB FLSH 2048 RAM FSUSB 2.0 12B ADC 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
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