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DLP-IO16 Development System

USB Interface Download Microcontroller PIC16F872

DLP-IO16 Development System
USB Interface Download Microcontroller PIC16F872
Power Isolation Switches
12.5 Volt DC-DC Converter
Target Microcontroller PIC16F84A and Buffers
Input / Output Connector
Revision 1.0
Please note that these utilities are intended for use by manufacturers and not by end-users of the products. Windows Software Operation A 32-bit Windows application that performs the firmware download process is available as a free download from dlpdesign.com. The application uses the DLL version of the device drivers.
The HELP button can be clicked at any time to read a description of each control. This download application uses the "OpenEx" function that allows multiple DLP-IOx boards to be connected to the same PC in a well-organized manner. This function will open the named device and return a handle that will be used for subsequent accesses. When the Search button is clicked, a dialog window is opened and all FTDI devices connected to the system are listed for easy selection. The device name can be its serial number or a device description both are text strings that are programmed into an EEPROM that is directly connected to the FT8U245AM. A third method, open by device number, can be used for new boards that have not had a serial number or description string written to the non-volatile RAM.
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Quick Start Guide This guide requires the use of a Windows 98 / 2000 PC that is equipped with a USB port. 1. Download the DLL version of the device drivers from either dlpdesign.com or ftdichip.com. Unzip the drivers onto a blank floppy disk or into a folder on the hard drive. 2. Download the serializer program from either dlpdesign.com or ftdichip.com. Unzip the package and place it in a folder on the hard drive. 3. Download the Windows download application from dlpdesign.com, unzip the program file and place it either on the desktop or in a folder on the hard drive. 4. Download the example software (DLPIO16X) from dlpdesign.com, unzip the package and place it in a folder. 5. Connect the DLP-IO16 board to the PC via the provided USB cable. When prompted, select the folder where the DLL version of the device drivers were stored in step one. Windows will then complete the installation of the device drivers for the DLP-IO16 board. Reboot the PC if prompted to do so. 6. Run the serializer program and write the VID (0403), PID (6001), a description string of your choosing and serial number as instructed in the instruction manual (PDF) that was downloaded with the serializer software. Terminate the serializer program and disconnect the DLP-IO16 board from the USB cable. Wait 10 seconds and reconnect the DLP-IO16 board. Reboot the PC if instructed to do so. 7. Run the download application that was saved to the hard drive in step 3. Select the Open by description radio button and click on Search. In the dialog window select the description string written in step 6.
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DIGITAL I / O INTERFACE
Connection to target electronics is made a 40-pin connector (JP3), however only 26 pins of the connector are used by the DLP-IO16. Pin Number 1 2 3 4 13, 14, 24 23 25 26 5, 6, 7, 8, 9, 10, 11, 12 15, 16, 17, 18, 19, 20, 21, 22 Description External Reset for the USB interface (input) Target Microprocessor Reset (active high)(output) USB Port Ground USB Port VCC Switched Ground Switched Vcc SLEEP# USB Standby Indicator SW2 Test Switch Digital Outputs Digital Inputs
The External reset pin (pin 1) can be used by the target electronics to reset the USB interface on the DLP-IO16. The target microcontroller reset signal (pin 2) is made available such that target electronics can also be held in the reset state, if desired, during the firmware download process. Five-volt power is made available for target electronics but care must be taken to not exceed a total of 500mA drawn from the USB port. The SW2 signal can be used by target electronics as a control signal (jumper JP2 removed) or read by the DLP-IO16 via U11.
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A 74HC374 octal D flip-flop is used to buffer the digital outputs. Output data from the target microcontroller is latched by the DOUT port pin which is generated by U13 the 74HC138 3-8 line decoder. The truth table for the 74HC138 is shown here. MUXA 0 1 0 1 MUXB 0 0 1 1 MUXG2A 74HC138 Active Low Output 1-0 Y0 - USB Read 1-0 Y1 - USB Write 1-0 Y2 - DOUT 1-0 Y3 - DIN 1-0 - Indicates a high to low transition
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Mechanical Drawings
Inches(millimeters) unless otherwise noted
.21 typ. (.8 typ.)
.50 typ. (12.7 typ.) 1.24 typ. (31.5 typ.) .97 typ. (24.7 typ.)
Reset
2.75 typ. (69.9 typ.)
Pin # Signal Type Description 1.17 typ. (29.7 typ.) .59 typ. (15.0 typ.)
2.25 typ. (57.2 typ.)
.95 typ. (24.1 typ.)
2.25 typ. (57.2 typ.) 2.75 typ. (69.9 typ.)
.49 typ. (12.6 typ.) typ.)
.42 typ. (10.7 typ.)
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Specifications (preliminary) Storage Temperature Ambient Temperature (Power Applied)
-65°C to + 150°C 0°C to + 70°C
Current specification does not include current drawn by target electronics via processor port pins. Early versions of the DLP-IO16 boards may not meet the minimum current requirement in Standby mode. Please note that no software or documentation is shipped with the DLP-IO16. The latest version of the drivers, Windows application software and all documentation can be downloaded at any time from www.dlpdesign.com.
Disclaimer
Neither the whole nor any part of the information contained in, or the product described in this datasheet, may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are supplied on an as is basis and no warranty as to their suitability for any particular purpose is either made or implied. DLP Design will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary information that may be subject to change without notice.
Contact Information
DLP Design PO Box 503762 San Diego, CA 92150-3762 Phone: 858-513-2777 Fax: 858-513-2777 Email: support@dlpdesign.com Internet: http://www.dlpdesign.com
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