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参数资料
| 型号： | DM240021 |
| 厂商： | Microchip Technology |
| 文件页数： | 30/44页 |
| 文件大小： | 0K |
| 描述： | KIT STARTER MPLAB FOR PIC24H |
| 视频文件： | Introduction to the PIC24H Starter Kit |
| 标准包装： | 1 |
| 系列： | MPLAB® |
| 类型： | MCU |
| 适用于相关产品： | PIC24H |
| 所含物品： | 板，线缆，CD |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
| 相关产品： | 828-1001-6-ND - 3-AXIS ACCELEROMETER ANALOG I/F 828-1001-1-ND - 3-AXIS ACCELEROMETER ANALOG I/F 828-1010-ND - BMA140 SHUTTLE BOARD FOR DEV KIT 828-1001-2-ND - 3-AXIS ACCELEROMETER ANALOG I/F |
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MPLAB ? Starter Kit for PIC24H Microcontrollers User’s Guide
4.1.1
Accelerometer Interface
The starter kit has a triaxial analog accelerometer (see schematics in Figure A-2). The
accelerometer has three analog outputs, one for each of the three spatial dimensions
(3D - X, Y, and Z). These three acceleration outputs are captured using the ADC inputs
AN4, AN5 and AN6, respectively, on the PIC24H MCU device.The ADC is set to
perform simultaneous sampling. The direction of acceleration and associated spatial
FIGURE 4-2:
+Y
DIRECTION OF ACCELERATION AND ASSOCIATED
SPATIAL DIMENSIONS FOR THE TRIAXIAL ANALOG
ACCELEROMETER
+Z
Gravity Vector
+X
Top Side
4.1.2
OLED Display Interface
The starter kit has a 128 x 64 pixel, monochrome organic LED array, which provides a
wide range of graphics and alphanumeric display options. It is interfaced to the PIC24H
MCU through the Parallel Master Port (PMP) module. The application uses the
Microchip Graphics Library to communicate with the OLED display.
4.1.3
Speaker Interface
The speech messages are compressed using the G.711 A-law and are stored in the
program memory of the PIC24H MCU. The wave files were G.711 compressed by using
the dsPIC33F Speech Encoder Utility for G.711 provided on the CD and also available
on the Microchip web site. When the demo application is running, the compressed
speech messages are loaded from the program memory and decompressed using the
G711 A-law decode algorithm and played out as a Pulse Width Modulated (PWM)
signal using the output compare module on the PIC24H. This signal is passed through
a 4th-order low-pass filter. This behaves like an integrator, whose output signal
amplitude and frequency depends on the duty cycle of the input PWM waveform. The
PWM frequency should be an integral multiple of the audio sampling rate. The output
of this low-pass filter feeds an audio amplifier. The speaker is driven by an audio power
amplifier (LM4853 Boomer). The speaker has a frequency range of 600 Hz to 22 kHz,
FIGURE 4-3:
PWM DEMODULATION
Pwm Signal From OCPWM
DS51780A-page 26
Low-pass Filter
R
C
Demodulated Audio Signal
? 2008 Microchip Technology Inc.
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相关代理商/技术参数 |
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| DM240311 | 功能描述:开发板和工具包 - PIC / DSPIC XLP 16-bit Dev 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: |
| DM240312 | 功能描述:开发板和工具包 - PIC / DSPIC PIC24FJ256DA210 Dev 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: |
| DM240313 | 功能描述:开发板和工具包 - PIC / DSPIC XLP 8-BIT Dev 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: |
| DM240314 | 功能描述:显示开发工具 LCD Explorer Dev Brd RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
| DM240315-2 | 功能描述:射频开发工具 Remote Control Demo Board RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
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