seeking Advice on how to properly spi a sbg6xxx

SB6XXX,SBV6XXX

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cheeto
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Joined: Fri Aug 01, 2008 6:14 pm

seeking Advice on how to properly spi a sbg6xxx

Post by cheeto »

Hi guys,
I would like to get some advice from some experience users out here.
I recently fried my sbg6580 while experimenting with it. It's actually a good way of learning.
So to my question,
SBG6xxx modems are somewhat of a pain when using SPI.
Imagine, I'm using test hooks and when i have to turn the modem over to do the spi, the hooks tend to fall off etc...

I tried taping the spi onto the back of the board but that didn't work. I really don't want to solder. Can you give me any advice on how to go about this.

THanks!!

ps. I used the 3m soic, and that was awful. The thing has way too much tension.
ricktendo
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Joined: Sat Nov 29, 2014 12:41 pm

Post by ricktendo »

Pomona SOIC clips have less tension, you can try them... BTW I know its a pain but you can get the test clips to stay if you mess with them a bit, don't turn it over once you have them on good


http://i.imgur.com/ODvlAUM.jpg
cheeto
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Posts: 93
Joined: Fri Aug 01, 2008 6:14 pm

Post by cheeto »

Thanks for getting back to me. I heard of the Panama clips. I just had no luck At all with the 3m soic.

I agree, that I shouldn't turn the modem over to apply the spi, but how can I get it to stay
At the exact place. Are you soldering the spi?

Again, many thanks, I really appreciate any input I can get on this
ricktendo
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Posts: 133
Joined: Sat Nov 29, 2014 12:41 pm

Post by ricktendo »

I have never had the need to solder, both test clips you see pictured and pomona soic clip work fine for me

http://i.imgur.com/WLRE6Ec.jpg
cheeto
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Post by cheeto »

Ok but how do you manage connect pin 4 on the usbjtag to the back of the modem?
I'm able to connect to the chip with the test hooks but what's killing me is when I flip the modem over to connect spi.
ricktendo
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Posts: 133
Joined: Sat Nov 29, 2014 12:41 pm

Post by ricktendo »

I don't use spi point, I use external 3.3v to power vcc pin on chip
cheeto
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Joined: Fri Aug 01, 2008 6:14 pm

Post by cheeto »

vcc pin on the chip. OK now got me there. Can you show me where the vcc is on the chip?

That would make a world of difference
ricktendo
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Posts: 133
Joined: Sat Nov 29, 2014 12:41 pm

Post by ricktendo »

Image

I have a UART Serial flasher, it has 3.3v and 5v out and I use this to power the chip (NOTE: if you use this method of powering the chip, there is NO need to power your modem on)

In this link you can see how some mod their usbjtag to get voltage out, or you can use a usb cable and 5v (but at your own risk)

viewtopic.php?t=4941&page=2
cheeto
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Joined: Fri Aug 01, 2008 6:14 pm

Post by cheeto »

Thank you so much!!!!* I really appreciate your feedback.
Ok so simply connect the USB ttl to the vcc with the modem off.
I've heard of some users using 3 or 5 volts.** I guess it all depends on the modem.
I recently bought a usb ttl,* but I* have a bad feeling it's a cheesy one.
The guy who sold it to me said that the red one is better than the* blue one.** But they ran out of the red one.** It had to do with the voltage drops or something like that

Regarding the pamona 5252 test clip I noticed that there are 2 versions.** A soic and non soic version.

Look:
*
http://www.amazon.com/POMONA-5252-TEST- ... omona+5252

Vs.

*http://www.amazon.com/Pomona-5252-0-050 ... omona+5252

Is there a difference?
Thanks!!!!!!!
ricktendo
Junior Member
Posts: 133
Joined: Sat Nov 29, 2014 12:41 pm

Post by ricktendo »

If they have the number 5252 they are the same clip, just somebody left out soic. Most chips are 3.3v (check datasheets always) but some of these have had no problem using a 5v usb cord (but you are risking frying it,) try your usb ttl maybe it will work just fine
cheeto
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Posts: 93
Joined: Fri Aug 01, 2008 6:14 pm

Post by cheeto »

MANY THANKS. Especially that VCC explanation was right on the money.
Can I use the VCC option with all SBG modems? (sbg6580, 6521 etc....)

I placed my order for the Pomona 5252.

Thanks again!
ricktendo
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Posts: 133
Joined: Sat Nov 29, 2014 12:41 pm

Post by ricktendo »

cheeto wrote:Can I use the VCC option with all SBG modems? (sbg6580, 6521 etc....)
For most spi 8 and 16 pin flash chips yes, the same applies (just make sure you have the correct pinout)... BTW Raspberry Pi is another device you can get 3.3v and/or 5v tap out of (just mentioning in case you have one lying around)
cheeto
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Joined: Fri Aug 01, 2008 6:14 pm

Post by cheeto »

I don't have the raspberry pi.. Just wondering, I have a sbg901. Can I use the VCC on there? I would really like to mess around with that.

Cheers
ricktendo
Junior Member
Posts: 133
Joined: Sat Nov 29, 2014 12:41 pm

Post by ricktendo »

What do you mean by use vcc?

If you are asking if you can power the vcc externally like you do this one, then yes. If you want to use it to power another chip I would not suggest you did this.
cheeto
Junior Member
Posts: 93
Joined: Fri Aug 01, 2008 6:14 pm

Post by cheeto »

Sorry about that, let me clarify, my idea would be to use my USB ttl 3.3v and hook it to the sbg901 chip's vcc.

Do you think that would work?

Just to clarify, the sbg901 isn't activated. I, perhaps like many others out here, am simply experimenting.

Many many thanks!!!!
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