From: James Cameron <quozl@laptop.org>
To: David Ashley <dashxdr@gmail.com>
Cc: linux-wireless@vger.kernel.org
Subject: Re: RTL usb adapter question
Date: Sat, 28 Oct 2017 14:44:04 +1100 [thread overview]
Message-ID: <20171028034403.GE8920@us.netrek.org> (raw)
In-Reply-To: <CABkE59AL=Cj_AoLo8qk01ia3vaHye29Wje=pPoA_r4mCPq_9mQ@mail.gmail.com>
On Fri, Oct 27, 2017 at 10:23:54PM -0500, David Ashley wrote:
> On 10/26/17, James Cameron <quozl@laptop.org> wrote:
> > Interesting, thanks. It should be a QFN 46 pin chip; you may have
> > counted 15 instead of 14 pins on the long edge. Send me a photograph
> > of the inside, off-list?
>
> I uploaded a couple of pictures here:
> http://www.linuxmotors.com/RTL8188CUS/
>
> You're right, I miscounted, it has 46 pins.
Thanks. The BZ5JA might be 5V to 3.3V switching voltage regulator,
with inductor above it.
Datasheet shows there is internal non-volatile memory, powered from
pin 27, which has a trace to an external filter capacitor.
The large zero ohm resistor bottom right is interesting; size chosen
for accessibility; probably for fault isolation or qualification.
In summary, the board design is consistent with the datasheet, and
confirms non-volatile memory that will contain configuration data and
probably firmware.
I agree with Larry; try the firmware file.
--
James Cameron
http://quozl.netrek.org/
next prev parent reply other threads:[~2017-10-28 3:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-25 18:43 RTL usb adapter question David Ashley
2017-10-25 19:35 ` Larry Finger
2017-10-26 21:45 ` David Ashley
2017-10-26 22:00 ` James Cameron
2017-10-27 1:28 ` David Ashley
2017-10-27 4:41 ` James Cameron
2017-10-28 3:23 ` David Ashley
2017-10-28 3:44 ` James Cameron [this message]
2017-10-27 18:49 ` Larry Finger
2017-10-25 22:03 ` Mark Greer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171028034403.GE8920@us.netrek.org \
--to=quozl@laptop.org \
--cc=dashxdr@gmail.com \
--cc=linux-wireless@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).