ISP: push button or jumper?

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Luis Digital on Sun Apr 03 18:13:51 MST 2011
Hello all,

What do you prefer to ISP in a protoboard, push button or jumper?

Thanks for participating.

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Luis Digital on Wed May 25 19:05:13 MST 2011
Hello all,

This is the analysis of my new boards:
[IMG]http://www.luisdigital.com/proyectos/lpc1111_protoboard/LPC1111_ADC_analysis02.png[/IMG]
The photos on the blog of Luis Digital.

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Luis Digital on Thu Apr 28 19:38:21 MST 2011

Quote: gbm
The capacitors on your board are placed incorrectly. Decoupling ones should be as cloce to the MCU as possible, while these at oscillator should be placed between the MCU and quartz.

Thanks for your instructions, but do not understand why crystal capacitors should go in that position. I understand that they must be close to the crystal, but not necessarily to the microcontroller.

@[IMG]http://knowledgebase.nxp.com/image.php?u=70&dateline=1259787193[/IMG] NXP_Europe

Thank you very much for your suggestions, AN11031 document is fantastic, well written and contains much useful information.

This is the graph of my board:
[IMG]http://luisdigital.com/proyectos/lpc1111_protoboard/LPC1111_ADC_analysis01.png[/IMG]
I performed the test using a voltage divider with two resistors of 1.8K ohms each. The average value of ADC was 510.
This board has been very interesting to me, I will make more tests later and will be posted here.

The board has other big failure, as the regulator has Inverted pin, and indications of the ports (P1, P2 inverted text).

Who does not make mistakes the first time? We'll see what happens with the second. :D

lpcware · ‎06-15-2016

Content originally posted in LPCWare by NXP_Europe on Wed Apr 27 14:48:56 MST 2011
Hello Luis,

Looks good, but ...

Agree about the placement of decoupling capacitors. Try to cover at much pcb surface as possible with a [B]ground plane[/B].
Try to lead signal tracks above return currents.

Use extra ground pins for attaching e.g. measuring equipment. Holes for screws can be handy.

See for suggestions about pcb-design: AN10974 and AN11031.

lpcware · ‎06-15-2016

Content originally posted in LPCWare by gbm on Wed Apr 27 13:53:23 MST 2011
The capacitors on your board are placed incorrectly. Decoupling ones should be as cloce to the MCU as possible, while these at oscillator should be placed between the MCU and quartz.

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Luis Digital on Wed Apr 27 13:44:48 MST 2011
Hello all,

The boards arrived yesterday and I assembled one, but I had taken the time to create some content.

In English, translated by Google:
LPC1111 prototype board.

Español:
Tarjeta de prototipo LPC1111.

lpcware · ‎06-15-2016

Content originally posted in LPCWare by larryvc on Wed Apr 06 11:37:28 MST 2011

Quote: Zero
Of course GND/TxD/RxD/GND

So you can connect TxD/RxD/GND or RxD/TxD/GND = all FTDI Serial to USB Converter connectors.

For the next revision add a USB converter and connector. This will get power to the board as well as communications. You can also add switching for USB or an alternate function for the UART.

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Wed Apr 06 08:44:15 MST 2011

Quote: Luis Digital

But what combination, what is the most used?

Of course GND/TxD/RxD/GND

So you can connect TxD/RxD/GND or RxD/TxD/GND = all FTDI Serial to USB Converter connectors.

lpcware · ‎06-15-2016

Content originally posted in LPCWare by igorsk on Wed Apr 06 08:40:00 MST 2011
It seems there's no standard.
VCC/RXD/TXD/GND
RXD/TXD/VCC/GND
GND/CTS#/VCC/TXD/RXD/RTS#

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Luis Digital on Wed Apr 06 08:30:00 MST 2011
Hi,

LPC1764 are already here in two partial trays, weighing two pounds and a half. 25MHz crystals are under way, and those of 12MHz are here, missing some things.

[IMG]http://luisdigital.com/varios/LPC1764_tray.jpg[/IMG]

But first the Protoboard LPC1111, which is already finished and ready to build:
[IMG]http://luisdigital.com/varios/lpc1111_protoboard.png[/IMG]

LPCXpresso compatible, and all the pins available.

I was thinking about adding two more pins GND and +3.3V to the serial port.

But what combination, what is the most used?

- GND/VCC/TX/RX
- TX/RX/VCC/GND
- etc.
- Leave it as is and you use it freely.

Thanks for your opinions.

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Luis Digital on Sun Apr 03 20:00:19 MST 2011

Quote: larryvc
Hardwired to another GPIO pin.:p

Jumper as Zero said "small and easy".

Luis did you get approval to buy the chips?

Yes, but at another store, and then fill out a stupid form. Then the order was on hold for a few days to review and then released. Right now it's here:

Quote:
On FedEx vehicle for delivery / Scheduled for delivery next business day

:D

I have to clarify that these are for the LPC1111 protoboard and one for LPC1342 (I have not yet started).

Will be my first PCB, so it really is a test.

Thanks for your opinions.

lpcware · ‎06-15-2016

Content originally posted in LPCWare by larryvc on Sun Apr 03 18:33:01 MST 2011
Hardwired to another GPIO pin.:p

Jumper as Zero said "small and easy".

Luis did you get approval to buy the chips?

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Sun Apr 03 18:18:32 MST 2011
How often do you need it?
I like jumper, small and easy :)