参数资料
| 型号： | AC164120 |
| 厂商： | Microchip Technology |
| 文件页数： | 25/36页 |
| 文件大小： | 0K |
| 描述： | BOARD SIGNAL ANALYSIS PICKIT |
| 标准包装： | 1 |
| 系列： | PICtail™ |
| 主要目的： | 接口，信号分析 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | PICkit? PICtail?1 |
| 主要属性： | 实时条形图，示波器，快速傅立叶转换（FFT） |
| 次要属性： | 柱状图 |
| 已供物品： | 板 |
| 产品目录页面： | 658 (CN2011-ZH PDF) |
| 相关产品： | DV164101-ND - KIT DEV PICKIT1 FLASH 8/14PIN |
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SIGNAL ANALYSIS PICtail?
DAUGHTER BOARD USER ’S GUIDE
Chapter 3. Lesson Projects
3.1
3.2
3.3
INTRODUCTION
The Signal Analysis PICtail Daughter Board can capture a variety of DC and AC signals
from the RC0/AN4 I/O port pin of the PIC16F684 using the internal 10-bit ADC. Ensure
that the applied signal does not exceed 5V peak-to-peak. If the signal is DC, ensure
that the voltage levels do not fall below 0V or exceed +5V. If the signal is AC, DC
decouple the signal using a decoupling capacitor and ensure that the signal level does
not exceed the DC limits stated above. Lesson 1 demonstrates how a DC signal can
be displayed from a thermistor. Lesson 2 demonstrates how an AC signal can be
displayed from a photodiode.
In addition to capturing analog signals, the Signal Analysis PICtail Daughter Board can
generate low frequency sine waves from Pulse Width Modulated (PWM) signal from
the ECCP module. I/O port pin RC5 is connected to a low-pass RC filter (R1 and C4)
and made available as a test point on the edge of the PCB. Lesson 3 demonstrates
how a 125 Hz sine wave can be generated.
HIGHLIGHTS
The following lessons are discussed in this chapter:
? Lesson 1 – Thermistor
? Lesson 2 – Photodiode
? Lesson 3 – Pulse Width Modulated Generated Sine Wave
LESSON 1 – THERMISTOR
A thermistor is a resistor that changes resistance in response to temperature changes.
Some have a positive temperature coefficient where the resistance increases with
temperature and others have a negative coefficient. For temperature measurement
purposes, the Negative Temperature Coefficient (NTC) versions are more linear.
The simplest configuration is shown in Figure 3-1. It is a resistor divider network where
the thermistor and a second resistor are connected in series between ground and a
voltage reference. The voltage between the resistors varies with the temperature and
can be measured via an A2D Converter. Also, this configuration has the added benefit
that voltage increases with temperature.
The voltage at the center is given by ADC counts = 1024 * R/(R+Rt). In this example,
the thermistor specified for 10 k ? at 25C. The bottom resistor is chosen to be 3.3 k ? .
That means 254 ADC counts correlates to 25C. Since the ADC is referenced to 5V
(nominal) 254 counts * 5/1024 = 1.241V.
Start the PICkit 1 Signal Analysis PC Application. Select the Real Time button, click on
the Strip Chart icon, and then click Go . By changing the temperature of the thermistor,
the response can be observed in real-time on the strip chart display. An example
For more information about thermistors, see Microchip Application Notes AN685,
AN689, AN867 and AN897, available on the PICkit 1 CD-ROM and on the Microchip
web site: www.microchip.com.
? 2004 Microchip Technology Inc.
DS51476A-page 21
相关PDF资料 |
PDF描述 |
|---|---|
| AC164121 | BOARD DAUGHTER PICTAIL ETHERNET |
| AC164122 | BOARD DAUGHT PICTAIL SD/MMC CARD |
| AC164123 | BOARD DAUGHTER ETH PICTAIL PLUS |
| AC164124 | BOARD DAUGHTER IRDA PICTAIL PLUS |
| AC164125 | BOARD DAUGHTER PICTAIL SPEECH |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AC164121 | 功能描述:以太网开发工具 Ethernet PICtail Dghtr Brd RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
| AC164121 | 制造商:Microchip Technology Inc 功能描述:IC ((NW)) |
| AC164122 | 功能描述:子卡和OEM板 PICtail Daughter Brd SD/MMC cards RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| AC164122 | 制造商:Microchip Technology Inc 功能描述:SEMICONDUCTOR ((NW)) |
| AC164123 | 功能描述:以太网开发工具 PICtail Daughter Brd Ethernet Plus RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
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