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参数资料
| 型号： | DM164120-1 |
| 厂商： | Microchip Technology |
| 文件页数： | 23/42页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO PICKIT 2 LP COUNT |
| 标准包装： | 1 |
| 系列： | PICkit™ |
| 类型： | MCU |
| 适用于相关产品： | 28 引脚 PIC16C、16F、18C、18F |
| 所含物品： | 3 个板（1 个装有元件的板，2 个裸板） |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
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LPC Demo Board Lessons
3.2.4
Lesson 4: Analog-to-Digital
This lesson shows how to configure the ADC, run a conversion, read the analog voltage
controlled by the potentiometer (RP1) on the board, and display the high order 4 bits
on the display.
The PIC16F690 has an on board Analog-to-Digital Converter (ADC) with 10 bits of
resolution on any of 11 channels. The converter can be referenced to the device’s V DD
or an external voltage reference. The LPC Demo Board references it to V DD as
provided by the USB cable. The answer from the ADC is represented by a ratio of the
voltage to the reference.
ADC = V/V REF * 1023
Converting the answer from the ADC back to voltage requires solving for V.
V = ADC/1023 * V REF
Two of the three factors on the right side of the equation are constants and may be
calculated in advance. This eliminates the need to actually divide, but still requires fixed
or floating point multiply to solve the equation on the fly.
However, sometimes, such as when reading a sensor, calculating the voltage is only
the first step. There may be additional math to calculate the meaningful data from the
sensor. For example, when reading a thermistor, calculating the voltage is only the first
step on the way to getting the temperature.
There are other means to convert ADC values, including a straight table look-up or a
piece-wise linear interpolation. Each of these represents different speed/memory
trade-offs.
The schematic ( Appendix A. “Hardware Schematics” ) shows the wiper on the
potentiometer is connected to pin RA0 on the PIC16F690.
Here’s the checklist for this lesson:
? Configure PORTA as an analog input, TRISA<0> = 1 , ANSEL<0> = 1
? Select clock scaling in ADCON1.
? Select channel, justification and V REF source in ADCON0.
? 2005 Microchip Technology Inc.
DS51556A-page 19
相关PDF资料 |
PDF描述 |
|---|---|
| DM164120-3 | BOARD DEMO PICKIT2 28-PIN |
| DM164120-5 | BOARD DEMO PICKIT 2 64/80-PIN |
| DM164123 | KIT MANAGEMENT SYSTEM PICDEM |
| DM180021 | KIT STARTER MPLAB FOR PIC18F MCU |
| DM183022 | BOARD DEMO PIC18FXX22 64/80TQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DM164120-1 | 制造商:Microchip Technology Inc 功能描述:DEVELOPMENT TOOLS - PICKIT 2 LOW PIN COU |
| DM164120-2 | 功能描述:开发板和工具包 - PIC / DSPIC PICkit 2 44-Pin Count Demo Brd RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM164120-3 | 功能描述:开发板和工具包 - PIC / DSPIC PICkit 2 Count Demo Board RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM164120-4 | 功能描述:开发板和工具包 - PIC / DSPIC PICkit 2 1 Dem Board RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM164120-4 | 制造商:Microchip Technology Inc 功能描述:PICkit 2 18-Pin Demo Board |
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