RCD Programmer(pic programmer)

liyf

RCD Programmer

I built a "dongle" type RCD Programmer.

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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.

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 SoftwareIC-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 !
DownloadPCB 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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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

Q I have seen that there is a variable resistor in the circuit.Could you please explain how to calibrate this part or could you recommend a value which I have to turn the resistor?
A R3 value is 10k ohms for almost devices. But some old device such as PIC16F84A requires a little a lot programming current. Therefore, R3 value can be adjusted by using trimmer potentiometer since RCD Programmer Version 2.3(about 1k ohms or less, for PIC16F84A).
Q What is the resistor value "0R" ?
A "0R" is the zoro-ohm resistor. It is the jumper wire which have the shape of the resistor. Of course, ordinary jumper wire can be used as "0R".