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Messages - Mariano D

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1
LPC9xx/LPC9xxx / Re: ICP problems on custom board
« on: April 10, 2007, 05:00:16 pm »
Unfortunly not Joe, I'm using the programer on ISP and go forward with my project.
Even when have some time I will be trying again, sorry for the late response. Maybe I will post some measurements of my board too.

Joe

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2
LPC9xx/LPC9xxx / Re: ICP problems on custom board
« on: March 28, 2007, 08:11:44 am »
Joe,

The big difference I think is on the base resistor of the PNP transistor, in your circuit is 1K and in the mine is 10K.
I will change it and get back to you, the both transistor 2N3906 and BC558 are very similar, and if you look the datasheet you will see similars VCEsat voltages versus IC current.
But if I didn t get good results with the resistors I will change it too.

Mariano

3
LPC9xx/LPC9xxx / Re: ICP problems on custom board
« on: March 27, 2007, 10:44:40 am »
Andy, in my last post I attached my board schematic. Maybe if have the time you can check it.

thanks Mariano

4
LPC9xx/LPC9xxx / Re: ICP problems on custom board
« on: March 26, 2007, 06:26:27 am »
Erik Im attaching a .pdf from my board.

Thanks in advance for your advice.
Mariano

5
LPC9xx/LPC9xxx / Re: ICP problems on custom board
« on: March 22, 2007, 10:49:20 am »
Andy, I will do that tomorrow and then get back to you.

Thanks

6
LPC9xx/LPC9xxx / Re: ICP problems on custom board
« on: March 22, 2007, 09:51:19 am »
Thanks Andy,

yes Im using the Joe circuit to control VDD pin on target.
What Im able to see with scope is that when push program on flashmagic, seems to the part read the device ID of the target, then erase it and when come to program the communication of the two devices stops.

Did you think that may be I have some spike on VDD target pin? Maybe I can use a small capacitor and that pin?



7
LPC9xx/LPC9xxx / ICP problems on custom board
« on: March 22, 2007, 06:25:14 am »
Hi All, I'm trying to make my own programmer board, for the LPC932A1, and use it in ICP mode.

The board is very similar to the MCB900 from keil, I make it following all the recomendations that I found on the AN's and this forum.

Up today I'm able to make all the functions in ISP mode (read, write, erase & set device configuration).

When I trying to use it as ICP (with the ISP-ICP bridge device on it) I can only use it for read, blank check, erase, read device ID & set device configuration, but I can't program the device.

Is necesary connect some other pin on the LPC932 that I'm using as bridge. Because if I use the original MCB900 board with this device I'm able to make all the functions on ISP & ICP.

If I didnt undestand wrong, for ICP only need to connect TXD RXD to the bridge device and the five pins to the target.
The circuit for control the target VDD pin on the AN10258 doesnt work properly, Im using a PNP & NPN transistor arrengement that works well.

Someone can advice me?

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