Own LPC1769 Board .. USB correct?

lpcware · ‎06-15-2016

Content originally posted in LPCWare by cell85 on Thu Sep 06 17:18:44 MST 2012
Hi,

I want to make my own Board. I wrote the Firmware already with my LPCXpresso 1769 after all checks, I'm now going to make my own dedicated Board (Smart Grid Energy Monitoring for selfmade Home-Solar Panels :)).

I wanted to ask if the USB is connected right? I wanted to use the usb as a VCOM.

VBUS from the USB PIN is connected to Pin 21 [P1.30] is this correct?
Is this necessary?

It would be glad if somebody could take a look (and maybe at the SWD too / JP1 is for direct LPCXpresso debugger connection) :)

WR
Sam

[ATTACH]827[/ATTACH]

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Fri Sep 07 19:42:42 MST 2012

Quote:

According to the http://www.keil.com/mcb1700/mcb1700-schematics.pdf

MCB1700 USB Device schematic (3-6) I added some Cap's and a 1Meg resistor for the USB ESD/EMI

:confused:

If you want to separate shield and GND, don't connect pin 5 of USB connector to shield :eek:

#1 R28 is a little bit high. 10k is a better choice.

#2 Q1 is switched without resistor. Add it or use a FET :)

lpcware · ‎06-15-2016

Content originally posted in LPCWare by cell85 on Fri Sep 07 19:05:41 MST 2012
Yeah you're the Pro ;)

According to the http://www.keil.com/mcb1700/mcb1700-schematics.pdf

MCB1700 USB Device schematic (3-6) I added some Cap's and a 1Meg resistor for the USB ESD/EMI

And I removed the not necessary Pins for SWD

Here is the final editon of the schematic: http://www.mikrocontroller.net/attachment/154223/final_board.pdf

(1- Error in the schematic : the 200k resistor is now a 4u7F Cap)
WR
Sam

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Fri Sep 07 18:09:06 MST 2012
Thanks for the offer. Unfortunately my own CAN-controlled solar charger is working since about 10 years (now with LPC11C14) :)

Since my office and my cellar are full of my own prototypes I think you'll find a better usage for academic purpose...

lpcware · ‎06-15-2016

Content originally posted in LPCWare by cell85 on Fri Sep 07 16:52:54 MST 2012
Thank you :)

If you want I can send you an Prototype for helping me ... this is a pcb for my academic project, we gonna make some pieces :) .
Thats all I can offer :D

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Fri Sep 07 16:44:53 MST 2012
Looks correct now.

#1 I usually don't connect JTAG-TDI (useless with SWD :rolleyes:)

#2 Also I don't connect 3.3V from LPC-Link to target board (target boards with higher current consumption can destroy LPC-Link) :)

lpcware · ‎06-15-2016

Content originally posted in LPCWare by cell85 on Fri Sep 07 16:13:33 MST 2012

Quote: Zero
LPC-Link is SWD
Your connector is still incompatible, what's R27 there

EXT_POW is supplying LPC-Link 3.3V regulator to supply your target board, if LPC-Link is not powered by USB. That's not working with 3.3V.
Anyway, do you need to supply your self powered board via LPC-Link ?
Use the resistor to pull this pin up and the jumper to ground it (to switch to ISP, if necessary)

No I'm talking about your funny R12/R2 construction, which you are trying to sell as a 1k pullup

That's nonsense.

- sorry, I totally messed it up! -> Reset button corrected (I copied it from my old stm32 board the cap was against peaks while pressing..)

- now my device is self powered -> ext_pow removed.

- ISP Pin is now pulled up and can be grounded with some GND Pins around the Board.

Quote: Zero
LPC-Link is SWD
Your connector is still incompatible, what's R27 there

- Yes I know that it is SWD, thats why I deleted the second SWD connector.
- OK this is confusing me, I copied it from the LPC Docu
[ATTACH]831[/ATTACH]
(Bigger Picture: http://pic-upload.eu/index.php?Section=Picture&Action=ShowPicBig&p=7ee4a8a7eb190077b9e47c4174bc1fea)
Maybe you can tell me exact what is wrong or what I've to change :(

Thank you!

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Fri Sep 07 12:02:56 MST 2012

Quote:

- I kicked-out the SWD to use the LPC-Link connector for other Debuggers too.
Is it ok to connect EXT_POW with VIN (3,3V Regulator Input)

LPC-Link is SWD :eek:
Your connector is still incompatible, what's R27 there :confused:

EXT_POW is supplying LPC-Link 3.3V regulator to supply your target board, if LPC-Link is not powered by USB. That's not working with 3.3V.
Anyway, do you need to supply your self powered board via LPC-Link ?

Quote:

- ISP P2.10 is now pulled up with a jumper to 3V3 over 22k Resitor.

Use the resistor to pull this pin up and the jumper to ground it (to switch to ISP, if necessary) :)

Quote:

Sorry I didn't get you. You're talking about R12 right (1k resistor)?

No I'm talking about your funny R12/R2 construction, which you are trying to sell as a 1k pullup :confused:

Quote:

I now connected a12K Resistor near the LPC-Link NRESET Pin, this should be ok now right? Did you mean this?

That's nonsense.

lpcware · ‎06-15-2016

Content originally posted in LPCWare by cell85 on Fri Sep 07 10:31:35 MST 2012
- I spent a USB UP LED you're right, its a nice feature.

- XTAL2 ... ok didn't see that, I had still the old schematics on my pc.

- I kicked-out the SWD to use the LPC-Link connector for other Debuggers too.
Is it ok to connect EXT_POW with VIN (3,3V Regulator Input)
[ATTACH]830[/ATTACH]

- ISP P2.10 is now pulled up with a jumper to 3V3 over 22k Resitor.

Quote: Zero

Just copy LPCXpresso schematic again: R31 = 12k (or use 10k). Also a jumper can be useful to switch to ISP as described in UM10360 Chapter32:
What's R2 there? Pulldown :confused:
Values from 10k-47k are OK there.

Sorry I didn't get you. You're talking about R12 right (1k resistor)?
I now connected a12K Resistor near the LPC-Link NRESET Pin, this should be ok now right? Did you mean this?

Updated Schematics : http://www.mikrocontroller.net/attachment/154205/AiMS2000.pdf

WR Sam

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Fri Sep 07 07:35:57 MST 2012

Quote:

In other PCB designs, which are using this RTC too, there was no Resistor for RTC X2 connected. How much should it be ? I know it depends on the crystal
FC135:
http://www.epsondevice.com/docs/qd/e...et?id=ID000805

So what do you think why EA changed their schematic from old 1768 to new 1769 adding 100k :confused:

Quote:

I don't know about ISP Pullup, could you tell me where and how much?

Just copy LPCXpresso schematic again: R31 = 12k (or use 10k). Also a jumper can be useful to switch to ISP as described in UM10360 Chapter32:

Quote:

Pin P2.10 is used as a hardware request signal for ISP and therefore requires special attention. Since P2.10 is in high impedance mode after reset, it is important that the user
provides external hardware (a pull-up resistor or other device) to put the pin in a defined state. Otherwise unintended entry into ISP mode may occur.

Quote:

Isn't 1K enough ? how much should be the best?

What's R2 there? Pulldown :confused:
Values from 10k-47k are OK there.

Quote:

This should be 8-pin connector of the LPC-Link -> Target
I tried to copy this form Page 5-7 upper left corner

Again: This connector (J4) is described at Sheet 4/7 :mad:

Quote:

#7 No USB-UP LED?
#8 No USB-CONNECT LED?
No, I think I don't need it.

Working with USB without LED's, Good Luck :rolleyes:

lpcware · ‎06-15-2016

Content originally posted in LPCWare by cell85 on Fri Sep 07 06:46:08 MST 2012
[U][B]Thank you Zero for you Tipps!
[/B][/U]
ok:

Quote: Zero

#1 No RTCX2 resistor?

In other PCB designs, which are using this RTC too, there was no Resistor for RTC X2 connected. How much should it be ? I know it depends on the crystal
FC135:
http://www.epsondevice.com/docs/qd/en/DownloadServlet?id=ID000805

Quote: Zero

#2 No ISP pullup :confused:

I don't know about ISP Pullup, could you tell me where and how much?

Quote: Zero

#3 Your Reset pullup is a little bit weak.

Isn't 1K enough ? how much should be the best?

Quote: Zero

#5 Don't know what JP1 is. If it's a 2.54mm connector (to be connected to LPCXpresso-J4) it's not pin compatible :confused:

This should be 8-pin connector of the LPC-Link -> Target
I tried to copy this form Page 5-7 upper left corner

(http://ics.nxp.com/support/documents/microcontrollers/pdf/lpcxpresso.lpc1769.schematic.pdf )

Quote: Zero

#6 Does Sheet 2-5 include a connector RxD0/TxD0 connector to rescue your board via FlashMagic :eek:

JP16 and JP17 are RX0 and TX0 (P0.2 & P0.3)

Quote: Zero

#7 No USB-UP LED?
#8 No USB-CONNECT LED?

No, I think I don't need it.

WR
Sam

lpcware · ‎06-15-2016

Content originally posted in LPCWare by Ex-Zero on Thu Sep 06 20:46:46 MST 2012

Quote:

I wanted to ask if the USB is connected right? I wanted to use the usb as a VCOM.

It's a LPCXpresso copy, so why should it be wrong?

BTW: If you use a FET (BSS84) for switching D+, a resistor (your R17) isn't necessary.

Quote:

VBUS from the USB PIN is connected to Pin 21 [P1.30] is this correct?

Yes.

Quote:

Is this necessary?

No.

Quote:

It would be glad if somebody could take a look (and maybe at the SWD too / JP1 is for direct LPCXpresso debugger connection)

#1 No RTCX2 resistor?

#2 No ISP pullup :confused:

#3 Your Reset pullup is a little bit weak.

#4 SWD connector looks OK.

#5 Don't know what JP1 is. If it's a 2.54mm connector (to be connected to LPCXpresso-J4) it's not pin compatible :confused:

#6 Does Sheet 2-5 include a connector RxD0/TxD0 connector to rescue your board via FlashMagic :eek:

#7 No USB-UP LED?

#8 No USB-CONNECT LED?

lpcware · ‎06-15-2016

Content originally posted in LPCWare by cell85 on Thu Sep 06 17:23:42 MST 2012
Here the hole Schematic for the MCU
http://www.mikrocontroller.net/attachment/154140/AiMS2000.pdf