Microchip Technology dsPICDEM 1.1 Modification Instructions
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Microchip Technology dsPICDEM 1.1 Modification Instructions

Microchip Technology dsPICDEM 1.1 Modification Instructions

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1.1
DSPICDEM 1.1 DEVELOPMENT BOARD 3.3 VDC RETROFIT
This retrofit allows the dsPICDEM 1.1 Development Board (DM 300014, PCB
Assembly 02-01719) to be used as a development tool for both dsPIC30F and
dsPIC33F devices. The development board is modified to replace the digital voltage
regulator, remove the analog voltage regulator and replace transceiver chips with
substitute components that support a wider range of operation (2.8–5.5 VDC).
After completing this modification you will be able to interchangeably work with 3.3 VDC
or 5 VDC devices by simply adding or removing the jumper on the voltage regulator
miniature board.
Note:
Other development boards that support both dsPIC30F and dsPIC33F devices include:
• dsPICDEM™ 80-Pin Starter Development Board (Part # DM300019)
• Explorer 16 Development Board (Part # DM240001)
If you have, or wish to purchase, one of these boards you probably don't need to retrofit
your dsPICDEM 1.1 Development Board.
If you do modify an existing dsPICDEM 1.1 Development Board, you are responsible
for maintaining good workmanship practices. To avoid damage to the printed circuit
board, it is strongly recommended that components be removed by first cutting the
leads and then unsoldering the remaining lead remnants.
Contact your sales representative or DSCD marketing for additional information.
THE
IF YOU MODIFY THE BOARD (REGARDLESS OF WHETHER YOU USE THESE
MODIFICATION INSTRUCTIONS OR PERFORM YOUR OWN MODIFICATIONS).
THE MODIFICATION INSTRUCTIONS ARE SUPPLIED BY MICROCHIP "AS IS".
MICROCHIP DOES NOT WARRANT THAT THE OPERATION OF THE
DEVELOPMENT BOARD, ITS FIRMWARE OR SOFTWARE WILL BE ACCURATE,
UNINTERRUPTED OR ERROR-FREE.
It is your responsibility to ensure that the board continues to function properly and any
application you develop meets your specifications.
© 2005 Microchip Technology Inc.
Modification Instructions
The LCD is not currently supported when 3.3 VDC operation is selected.
PICDEM 1.1 DEVELOPMENT BOARD 90-DAY WARRANTY WILL EXPIRE
DS
dsPICDEM™ 1.1
DEVELOPMENT BOARD
3.3V RETROFIT
3.3V Retrofit Rev 1.0-page 1

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Summary of Contents for Microchip Technology dsPICDEM 1.1

  • Page 1 If you have, or wish to purchase, one of these boards you probably don’t need to retrofit your dsPICDEM 1.1 Development Board. If you do modify an existing dsPICDEM 1.1 Development Board, you are responsible for maintaining good workmanship practices. To avoid damage to the printed circuit board, it is strongly recommended that components be removed by first cutting the leads and then unsoldering the remaining lead remnants.

  • Page 2: What You Need

    RS422 Transceiver used with the RS-485/RS-422 port, all these parts are contained in a retrofit kit. Ref. Item Description Value Mfg Part # Des. Parts on dsPICDEM 1.1 Development Board — U1,U3 IC SMT, Driver, RS232 Xmtr/Rcvr, MAXIM MAX3232CDWR 16-SOIC(wide) IC SMT, 3.3V CAN TX/RX, 8P —...

  • Page 3: Modification Instructions

    Figure 1 provides an overview of what you need to do to complete this modification. Before proceeding, read the step-by-step procedures carefully to avoid damaging the dsPICDEM 1.1 board or any of the components. Figure 1: dsPICDEM 1.1 Retrofit Process...
  • Page 4 2. Unsolder the lead remnants. 3. Install the miniature regulator board: • Solder the miniature board to the dsPICDEM 1.1 board at the four solder points shown in Figure 2. Be sure the PCB assembly does not overlap the V pads.
  • Page 5 Figure 4: Regulator VR2 Bypass Jumper Solder jumper between + side of C18 and end of L1 closest to LCD1 AVDD LCD1 AGND RP1 RP2 RP3 LED1 LED2 LED3 LED1 © 2005 Microchip Technology Inc. 3.3V Retrofit Rev 1.0-page 5...

  • Page 6: Using The Board

    5V Operation — Jumper installed 3.3V Operation — Jumper removed SCHEMATIC DIAGRAM Figure 6 is a schematic of the digital voltage regulator replacement circuit. Figure 6: dsPICDEM 1.1 Development Board 3.3V Modification LM317S 249R 294R © 2005 Microchip Technology Inc.

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