Microchip Technology DsPICDEM 1.1 Manuale utente

dsPICDEM™ 1.1

DEVELOPMENT BOARD

3.3V RETROFIT

Modification Instructions

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.

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.

Note: The LCD is not currently supported when 3.3 VDC operation is selected.

THE DSPICDEM 1.1 DEVELOPMENT BOARD 90-DAY WARRANTY WILL EXPIRE

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.

dsPICDEM™ 1.1 Development Board 3.3V Retrofit

1.1.1 What You Need

The following table lists the parts you need for this modification. Except for the

RS422 Transceiver used with the RS-485/RS-422 port, all these parts are contained in

a retrofit kit.

Item Ref.

Des. Qty Description Value Mfg Mfg Part #

Parts on dsPICDEM 1.1 Development Board

1 U1,U3 2 IC SMT, Driver, RS232 Xmtr/Rcvr,

16-SOIC(wide)

—MAXIM MAX3232CDWR

2 U12 1 IC SMT, 3.3V CAN TX/RX, 8P

SOIC (0.150")

—TI SN65HVD230DR

3U41RS422

(See Note 1)

—MAXIM MAX3491ECSD

Parts on Regulator Adapter Board

4 VR1 IC Positive Adj Regulator TO-263 —National

Semi

LM317S

5 J1 1 2 Pin.100, SMT header —Samtec

TSM-102-01-S-DV

6 R1 1 Resistor, 1206 412R Rohm MCR18EZHF4120

7 R2 1 Resistor, 1206 249R Rohm MCR18EZHF2490

8 R3 1 Resistor, 1206 294R Rohm MCR18EZHF2940

9 1 PCB Assembly —— —

10 3 Jumper wire —— —

1: This part is not supplied in the retrofit kit. The RS422 Transceiver will only need to be

replaced if your application uses this feature with 3.3 VDC operation.

Note: The modification kit does not include a dsPIC33F device. It must purchased

separately.

Modification Instructions

1.2 OVERVIEW OF MODIFICATION

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

1.3 STEP-BY-STEP PROCEDURES

1.3.1 Step One: Replace CAN Transceiver

1. Remove existing CAN chip U12 by cutting the leads and discarding the chip.

2. Carefully unsolder each lead remnant.

3. Install the TI SN65HVD230DR transceiver chip included.

Note: Be sure to align pin 1 on the chip to pin 1 on the board.

1.3.2 Step Two: Replace UART Transceivers

1. Remove existing UART chips U1 and U3 (and, optionally, RS422 chip U4, by

cutting the leads and discarding the chip.

2. Carefully unsolder each lead remnant.

3. Solder the MAX3232CDWR transceiver chips into reference designator locations

U1 and U3. If appropriate, solder the MAX3491ECSD transceiver chip into refer-

ence designator location U4.

Note: Be sure to align pin 1 on the chip to pin 1 on the board.

Step Two: Replace UART

Transceivers U1 & U3 with the

MAX 3232 chips in the retrofit

kit. Optionally, replace RS422

Transceiver U4 with MAX

3491 chip.

CAUTION

To avoid damage to the PCB, remove components by

cutting the leads. Then carefully unsolder each lead.

Step One: Replace CAN

Transceiver U12 with the

SN65HVD230DR chip in the

retrofit kit.

Step Three: Replace the digi-

tal voltage regulator (VR1)

with the miniature PCB assem-

bly (refer to step-by-step pro-

cedures).

Step Four: Remove the analog

voltage regulator (VR2). Step Five:

Install jumper wire from the

plus end of C18 to the closest

end of L1 to bypass analog reg-

dsPICDEM™ 1.1 Development Board 3.3V Retrofit

1.3.3 Step Three: Replace Voltage Regulator VR1

1. Cut the leads on the digital voltage regulator chip (VR1), then unsolder the chip

from its heat sink pad.

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 VIN and

VOUT pads. Use a HOT iron to ensure good solder flow through the holes.

• Add jumper wires for VIN and VOUT.

4. Place the regulator on the heat sink pad on the miniature regulator board, aligning

the pins with the soldering pads and leaving a small area of the heat sink exposed

near the regulator's tab (approximately 1.25 mm), as shown in Figure 3.

5. Solder the three regulator leads. Then solder the regulator tab to the exposed area

of the heat sink.

1.3.4 Step Four: Remove Voltage Regulator VR2

1. Cut the three leads on regulator VR2.

1. Unsolder the tab to remove the regulator chip.

2. Unsolder the lead remnants.

3. Leave the VR2 socket empty.

1.3.5 Step Five: Install VR2 Bypass Jumper

1. Solder one end of wire jumper to the end of L1 closest to the LCD (see Figure 4).

2. Solder the other end to the + side of C18

Modification Instructions

Figure 2: Installing the Regulator Miniature Board

Figure 3: Installing the Regulator Chip

Figure 4: Regulator VR2 Bypass Jumper

VR1 POWER

Solder points

VIN Jumper

VOUT Jumper

Jumper for 5V operation

(removed for 3.3V operation)

Note corner alignment

Outline of regulator circuit

Heat sink pad

Leave space between the

miniature PCB assembly and

the pads for the VIN and VOUT

leads to prevent shorting.

Tab

Heat sink pad

Solder regulator leads to board

Solder regulator tab to heat sink

pad. Leave 1.25 mm gap between

tab and silk screen edge

LCD1

C18 L1

AVDD

AGND

VR2

LED1 LED2 LED3 LED1

RP1 RP2 RP3

Solder jumper between + side of C18

and end of L1 closest to LCD1

dsPICDEM™ 1.1 Development Board 3.3V Retrofit

1.4 USING THE BOARD

To use the board with +5 VDC devices, install the regulator jumper (see Figure 5).

To use the board with +3.3 VDC devices, remove the regulator jumper.

Figure 5: Regulator Jumper

1.5 SCHEMATIC DIAGRAM

Figure 6 is a schematic of the digital voltage regulator replacement circuit.

Figure 6: dsPICDEM 1.1 Development Board 3.3V Modification

Note: Remember that the LCD is inoperable when the board is used at 3.3 VDC.

5V Operation — Jumper installed

3.3V Operation — Jumper removed

IN OUT

ADJ

VIN VOUT

VR1

LM317S

412R

R3 249R

294R

Indice

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