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Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:07 am
by redhawk
One of the launch videos does show a Raspi break out board mating to the new header without issue
What's the URL for the launch video??

Richard S.

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:08 am
by RaTTuS

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:08 am
by jdb
redhawk wrote: I've also noticed the presence of inductors and MOSFETs around the micro USB port, am I to understand that the LDOs have been replaced with switching bucks??

Is back feeding the USB port still safe with this board??

Richard S.
VBus now passes through the USB power switch. It is impossible to power up a B+ via backfeed, but reverse current (up to the reverse trip point of the power switch) on a powered-on B+ will pass through.

This is one of the reasons that there is now an "Ideal Diode" on the 5V input to the Pi. It's an exercise for the reader to figure out how it works.

http://docs-europe.electrocomponents.co ... 2faa1d.pdf

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:09 am
by fruitoftheloom

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:10 am
by jamesh
redhawk wrote:
One of the launch videos does show a Raspi break out board mating to the new header without issue
What's the URL for the launch video??

Richard S.
They are all linked from the launch blog post.

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:15 am
by arm2
A lot of very useful improvements. Thank You RPF!
I can't see any pads for a reset switch, am I being blind?
I can see two pads marked 'RUN' what does it do?

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:17 am
by texy
redhawk wrote:According to the CPC website the GPIO pins have been extended from 26 to 40 it also claims that it's backwards compatible with existing 26 pin projects.
This is actually wrong since a 26 pin connector will not be able to sit on a 40 pin GPIO due to the housing hitting pins 27 and 28.
Richard S.
That may well be true when talking about ribbon cable connectors, but not for fixed (pcb) mounted connectors. So if the additional hardware is ribbon cable connected, there may well be a problem, but for 'shield' type direction connection, it should be OK.
Texy

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:18 am
by jdb
arm2 wrote:A lot of very useful improvements. Thank You RPF!
I can't see any pads for a reset switch, am I being blind?
I can see two pads marked 'RUN' what does it do?
The RUN header is the same as P6 on the Model B, it's just been moved next to the PWR/ACT LEDS (top left).

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:29 am
by jdb
croston wrote:What is the board revision number as reported by /proc/cpuinfo ? Is there a complete list somewhere of all revision numbers that have ever been used?

I need this to update the RPi.GPIO module!
Board revision for the B+ is 0x10.

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:30 am
by 0xFF
Can model B+ be powered directly from 40 pin header's 5V rail ?

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:34 am
by ShiftPlusOne
0xFF wrote:Can model B+ be powered directly from 40 pin header's 5V rail ?
GPIO, yes. But not USB.

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:34 am
by jdb
0xFF wrote:Can model B+ be powered directly from 40 pin header's 5V rail ?
Yes. The 5V connection point is *after* the input diode.

For add-on board manufacturers that want to power the Pi this way, it is strongly recommended to add a duplicate of the input diode circuit between the power source and the 5V pin supplying the Pi.

USB Backpower is now not possible, as described previously.

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:36 am
by joan
ShiftPlusOne wrote:
0xFF wrote:Can model B+ be powered directly from 40 pin header's 5V rail ?
GPIO, yes. But not USB.
Will the CPUs work?

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:39 am
by jdb
Bonus feature: flip a B+ over. It's covered in test points (that you can void your warranty soldering to).

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:46 am
by SteveSpencer
Since we are now told not to use ID_SD and ID_SC, presumably things that used P5 connections will no longer work, or will stop working at some point when the firmware changes to support the ID EEPROM mechanism?

I'm hoping that more details of this will be forthcoming soon, and I'm even more hopeful that RS genuinely do have stock so they can ship my order to arrive tomorrow as promised -- the joy of being an account customer.

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:48 am
by ame
Does the new board have the capability to turn itself off (i.e. sudo shutdown -h now turns off power)? Or must we have an external switch?

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:51 am
by joan
SteveSpencer wrote:Since we are now told not to use ID_SD and ID_SC, presumably things that used P5 connections will no longer work, or will stop working at some point when the firmware changes to support the ID EEPROM mechanism?

I'm hoping that more details of this will be forthcoming soon, and I'm even more hopeful that RS genuinely do have stock so they can ship my order to arrive tomorrow as promised -- the joy of being an account customer.
I've had a dispatch notification and a Parcelforce tracking number from RS.

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:54 am
by arm2
jdb wrote:
arm2 wrote:A lot of very useful improvements. Thank You RPF!
I can't see any pads for a reset switch, am I being blind?
I can see two pads marked 'RUN' what does it do?
The RUN header is the same as P6 on the Model B, it's just been moved next to the PWR/ACT LEDS (top left).
For those people like me who need it spelled out. P6 is the reset header! I wonder why the call it 'RUN' now?

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:55 am
by SteveSpencer
I don't have a parcelforce notification, but it does say dispatched for my order :)

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:55 am
by ShiftPlusOne
joan wrote:
ShiftPlusOne wrote:
0xFF wrote:Can model B+ be powered directly from 40 pin header's 5V rail ?
GPIO, yes. But not USB.
Will the CPUs work?
Not sure what you mean, but I'm going to go with 'yes'. =)

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 11:57 am
by fruitoftheloom
joan wrote:
SteveSpencer wrote:Since we are now told not to use ID_SD and ID_SC, presumably things that used P5 connections will no longer work, or will stop working at some point when the firmware changes to support the ID EEPROM mechanism?

I'm hoping that more details of this will be forthcoming soon, and I'm even more hopeful that RS genuinely do have stock so they can ship my order to arrive tomorrow as promised -- the joy of being an account customer.
I've had a dispatch notification and a Parcelforce tracking number from RS.
+1 hopefully receive tomorrow as have no Pi, as a relation has borrowed for school project !

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 12:00 pm
by arm2
Any Idea when the schematics will be released?
The Adafruit write up https://learn.adafruit.com/introducing- ... b?view=all includes quite a few parts of the B+'s schematic!

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 12:03 pm
by joan
ShiftPlusOne wrote: ...
Not sure what you mean, but I'm going to go with 'yes'. =)
I'm trying to find out what works if you supply power via the P1 header.

Yes, GPIO and CPUs.
No, USB.

Will everything else work, Ethernet, HDMI, audio, composite video, i,e, is it just the USB ports which won't work if you power via P1 rather than the microUSB?

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 12:05 pm
by jdb
SteveSpencer wrote:Since we are now told not to use ID_SD and ID_SC, presumably things that used P5 connections will no longer work, or will stop working at some point when the firmware changes to support the ID EEPROM mechanism?
The board ID is different between B and B+. This will be used to differentiate whether the EEPROM gets probed or not. Firmware updates will be compatible across the revisions.

Re: The Raspberry Pi Model B+ Q&A thread

Posted: Mon Jul 14, 2014 12:06 pm
by jamesh
joan wrote:
ShiftPlusOne wrote: ...
Not sure what you mean, but I'm going to go with 'yes'. =)
I'm trying to find out what works if you supply power via the P1 header.

Yes, GPIO and CPUs.
No, USB.

Will everything else work, Ethernet, HDMI, audio, composite video, i,e, is it just the USB ports which won't work if you power via P1 rather than the microUSB?
Everything should work - that post was referring the power INPUT, not what is powered on. So you can still power up the device using GPIO, but not by backpowering via USB.