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RCD Programmer

Click to enlarge !
I built a "dongle" type RCD Programmer.

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Click to enlarge !
A RCD Programmer which I always use.

I believe that the "JDM Programmer" is cheap and very useful PIC Programmer. However, since "JDM Programmer" cannot control VDD, the algorithm "VPP before VDD" is inapplicable. Programming to the latest device from this reason may go wrong when using CONFIG settings as "Internal oscillator" "MCLR OFF". These devices are given power from the "JDM programmer",and execute program code. An error may come out by verification, or it may become impossible erasure and become impossible re-programming . In order to solve this problem, I designed a programmer based on the "JDM programmer." Since this programmer was made of resistors, capacitors, and diodes, I named this the "RCD Programmer." "Hardware settings" of IC-Prog are the same as the "JDM programmer."

I think that the same problem still exists about programming other devices. (added: 2005-02-06 JST)

Schematic

C1 is a charge pump capacitor*. This works voltage doubler. When TxD is negative voltage, C1 is charged through D7 from GND. If TxD carries out turn-on, since it will become positive voltage, the voltage charged in C1 is raised. The created high voltage is regulated by D7 to about 13V. If TxD carries out turn-on, both supply voltage will be created. CTS and RTS also join creation of supply voltage. This VDD is delayed and is applied by C2 and R4. D1-D5 are clump diodes. Since voltage drop is within the limits which can be disregarded, general purpose small rectifier is sufficient as the diode to be used. e.g. 1N4148,1S1588(Toshiba),1S2076A(Renesas or Hitachi),1S133(ROHM) . When not succeeding by the device which needs programming current like 16F84(A), the value of R3 is made small. Probably, it will be good using a trimmer resistor as R3.

After I published the RCD Programmer on my Web site, it has passed in one year. I obtained various questions about the RCD Programmer from many people. And Microchip newly developed Low-Pincount PICs which built in the memory exceeding 1k words. I recommend change capacity of C1 to 470uF now for stable programming.

*About general description of charge pump, please refer to DC/DC Conversion without Inductors(Maxim/Dallas Application Note 725). A important point is not a charge pump but controll of VDD in the RCD Programmer circuit. If this point is excluded, the JDM Programmer is far more excellent than the RCD Programmer. Because the RCD Programmer works by the pulse only once, the capacitor power cannot be continued for a long time.

Consideration for the computers which have poor surge protection (added: 2005-02-06 JST)

When you insert a RCD Programmer into the COM port of your computer during operation("Hot Plug-in" or "Hot Socketing"), inrush current is generated. It seems that it is weak to an overcurrent and a short circuit although "EIA/TIA -562" is power saving and compatible with "EIA/TIA-232-E." So, I added 200-ohm current limitation resistor. This resistor limits peak current and help computers which have poor surge protection circuit inside. However, the RCD programmer will not work well as for such a computer because the voltage of the COM port might be very low.

Click to enlarge ! Click to enlarge !
RCD Programmer for the computers whitch have poor surge protection
RCD Programmer with 18-pin TEXTOOL(3M)

Table of Supported Devices

Device
Code Mem
Required Voltage
IC-Prog
WinPic
PICProg4U
Name
Words
on MCLR
100uF
470uF
100uF
470uF
470uF
Note
PIC10F200F629
256x12
12.5 <= VPP <= 13.5
N/A
N/A
N/A
N/A
R
(3)
PIC10F202F629
512x12
12.5 <= VPP <= 13.5
N/A
N/A
N/A
N/A
R
(3)
PIC10F204F629
256x12
12.5 <= VPP <= 13.5
N/A
N/A
N/A
N/A
R
(3)
PIC10F206F629
512x12
12.5 <= VPP <= 13.5
N/A
N/A
N/A
N/A
R
(3)
PIC12F508F629
512x12
12.5 <= VPP <= 13.5
J
J
N/A
N/A
R
PIC12F509F629
1024x12
12.5 <= VPP <= 13.5
J
J
N/A
N/A
R
PIC12F629F629
1024x14
VDD + 3.5 (Max 13.5)
J
J
C/R
C/R
R
PIC12F635
1024x14
10 <= VPP <= 12
N/A
N/A
C/R
C/R
R
(1)
PIC12F675
1024x14
VDD + 3.5 (Max 13.5)
J
J
C/R
C/R
R
PIC12F683
2048x14
10 <= VPP <= 12
N/A
N/A
C/R
C/R
R
(2)
PIC16F54
512x12
12.5 <= VPP <= 13.5
N/A
N/A
N/A
N/A
R
PIC16F57
2048x12
12.5 <= VPP <= 13.5
N/A
N/A
N/A
N/A
R
(3)
PIC16F59
2048x12
12.5 <= VPP <= 13.5
N/A
N/A
N/A
N/A
R
(3)
PIC16F627
1024x14
VDD + 3.5 (Max 13.5)
J
J
C/J/R
C/J/R
R
PIC16F627A
1024x14
10 <= VPP <= 13.5
N/A
N/A
C/J/R
C/J/R
R
(3)
PIV16F628
2048x14
VDD + 3.5 (Max 13.5)
N/A
J
C/J/R
C/J/R
R
PIC16F628A
2048x14
10 <= VPP <= 13.5
N/A
J
C/J/R
C/J/R
R
(3)
PIC16F630
1024x14
VDD + 3.5 (Max 13.5)
J
J
C/J/R
C/J/R
R
PIC16F636
2048x14
10 <= VPP <= 12
N/A
N/A
C/R
C/R
R
(1)
PIC16F648A
4096x14
10 <= VPP <= 13.5
N/A
J
N/A
C/J/R
R
(3)
PIC16F676
1024x14
VDD + 3.5 (Max 13.5)
J
J
C/J/R
C/J/R
R
PIC16F684
2048x14
10 <= VPP <= 12
N/A
N/A
R
R
R
(1)
PIC16F688
4096x14
10 <= VPP <= 12
N/A
N/A
N/A
C/R
R
PIC16F818
1024x14
VDD + 3.5 (Max 13.5)
J
J
C/J/R
C/J/R
R
(4)
PIC16F819
2048x14
VDD + 3.5 (Max 13.5)
J
J
C/J/R
C/J/R
R
(4)
PIC16F84
1024x14
12 <= VPP <= 14
J
J
N/A
N/A
N/A
PIC16F84A
1024x14
12 <= VPP <= 14
J
J
N/A
N/A
R
(5)
PIC16F87
4096x14
VDD + 3.5 (Max 13.5)
N/A
N/A
J
J
R
PIC16F88
4096x14
VDD + 3.5 (Max 13.5)
J
J
J
J
R

Color
Pincount
Color
Results
Mark
Interface Setting
6/8-pin
Success
J
JDM Programmer 2
14-pin
Passable
C
COM 84

18/28/40- pin

Failure
R
RCD Programmer

(1)WinPic-- When both IntOSC and internal MCLR options are selected, programming is successful satisfactory. However, after exiting Program/Verify mode, the device may be unable to be read(or verify) correctly. Please feel easy ! The device can be Re-programmed.

(2)The Device ID of PIC12F683 is 0x0460. ID value "0x1280" shown in the data sheet(DS41204C) is not corrected for now(corrected in the autumn of 2004, DS41204D).

(3)Use an Adaptor, or ICSP Method for these devices ! Adaptor for SOT23 PIC10F2xx(example), for PIC16F57(example), for PIC16F627A/628A/648A( See photo below).

(4)WinPic-- Enable WinPic 's option "raise Vdd before MCLR=Vpp" !

(5)WinPic-- Don't use WinPic to programming to PIC16F84A with RCD Programmer! Use IC-Prog or PICProg4U!

Note:WinPic--The erasure and the re-programming might become impossible as for the devices afterwards when both IntOSC and internal MCLR options are selected besides by using WinPic that sets "InterfaceType" to "JDM Programmer 2". In that case, please try after clearing all the check boxes in "Interface Test".

The trick of programming PIC12F508/509 using IC-Prog

How to make an adaptor for PIC16F627A/628A/648A.
Use a cheap 18 pin IC socket.

Cut away these three pins(No.11,No.16 and No.17)of a 18 pin IC Socket.

Insert this simple adapter between a device and a RCD programmer's IC socket.

Programming Software

IC-Prog Author: Bonny Gijzen

WinPic Author: Wolfgang Büscher

PICProg4U Author: FENG3
Requires .NET Framework 1.1 or later.
The available COM port and the RCD Programmer are detected automatically.
Supported devices are PIC10F200/202/204/206/220/222, PIC12F508/509/510, PIC16F54/57/59, PIC12F629/635/675/683, PIC16F627/628, PIC16F627A/628A/648A,PIC16F630/636/639/676, PIC16F684/685/687/688/689/690, PIC16F818/819, PIC16F84A, PIC16F87/88, PIC16F870/871/872/873/874/876/877, PIC16F873A/874A/876A/877A.)
English version is available now!
Spanish version is available now!
Chinese version is available now!

Important !

Probably you should read "OSCCAL(internal OSCillator CALibration) word" and "BG(BandGap calibration) bits" in a device first, and should make a note of them on a piece of paper, before you start programming, so that it may not erase accidentally.

All OTP(One Time Programmable) devices and greater than 18-pin devices are not suppoerted !

Download

PCB and other files (PDF format) can be downloaded from here.

"Dongle" type RCD Programmer
Note: J5 is a jumper wire or a jumper resistor.
PCB Components layout

RCD Programmer which I always use
This board requires a 90°printed board mount D sub connector and a trim resistor. It is the size which can also mount 18pin TEXTOOL. Note: "0R" is a jumper wire or a jumper resistor.
PCB Components layout Bill Of Material

RCD Programmer for the computers whitch have poor surge protection
PCB Components layout Bill Of Material

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If a PDF file prints smaller or larger than expected (for example, 90% of the original size) from an Adobe Acrobat product (Adobe Reader an Adobe Acrobat), Do one or more of the following:

Print using different paper source options.
Choose File > Print, and then do one of the following:
-- In an Acrobat 6.x product , select Choose Paper Source by PDF Page Size, and then click OK.
-- In an Acrobat 5.x product:
1. Click Advanced.
2. Select Choose Output Tray by PDF Page Size.
3. Click OK to close the Print Settings dialog box, and then click OK to print.

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Various Examples

by KTaro

by VIC
by Oga
by Takepyon
by Airband
by Filia Sofia
by Alexandre Costa
PCB layout by Alexandre
by Helmut Stettmaier

by Henri

by Sven-Erik Ottosson

by Momoji
by Stefan Pietzonke
by Daniel José Viana
PCB layout (Eagle file)

by Daniel José Viana

FAQ

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Last modified: 2008-09-21 JST

2004-03-06 JST