X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
X-Proofpoint-Virus-Version: vendor=fsecure
 engine=2.50.10432:5.14.151,1.0.33,0.0.0000
 definitions=2015-06-30_01:2015-06-29,2015-06-30,1970-01-01 signatures=0
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0
 suspectscore=5 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0
 reason=mlx scancount=1 engine=7.0.1-1412110000 definitions=main-1506300140
Content-type: text/plain; charset=utf-8
MIME-version: 1.0 (Mac OS X Mail 8.2 \(2098\))
Subject: Re: [geda-user] Stepper driver issues
From: "Chris Smith (space DOT dandy AT icloud DOT com)" <geda-user AT delorie DOT com>
In-reply-to:
 <CALSZ9groHntpQ+p7=4jo7BhDkAPA+EvAxhsqPpFp3CgHDeR6bw AT mail DOT gmail DOT com>
Date: Tue, 30 Jun 2015 09:17:10 +0100
Message-id: <93EB0BD3-96CA-4352-8170-A49682C04D44@icloud.com>
References:
 <CALSZ9gq73RBxHV5LPe7pQWNO3kK7EPXaRiN0U7zFBV9BsQX78w AT mail DOT gmail DOT com>
 <55395CD0 DOT 70107 AT m0n5t3r DOT info> <20150423214501 DOT GD47936 AT cicely7 DOT cicely DOT de>
 <CALSZ9gqAPj6h2Z_gLvHTBdL-cnQ6p_juTonjE0e+oDAaRy7KTQ AT mail DOT gmail DOT com>
 <55530929 DOT 2070301 AT gmail DOT com>
 <CALSZ9grqsRc+U5p=LeQpzBU6_c6tWg-VrDYEqav99K_1L1P=2Q AT mail DOT gmail DOT com>
 <5555971C DOT 8000902 AT gmail DOT com>
 <CALSZ9gqtmaetZs7rHrx_sTrc1vqKkMMvDhPf0P9vs4EmuC9Q3w AT mail DOT gmail DOT com>
 <20150628171205 DOT GB94280 AT cicely7 DOT cicely DOT de>
 <CALSZ9gqeKWLzwihV4SgXtm17Jg1EGUn70NxhT+n7FgnfzMjY0g AT mail DOT gmail DOT com>
 <20150628180958 DOT GD94280 AT cicely7 DOT cicely DOT de>
 <CAC4O8c88ehzPCEJ=W0g1gXAOzn8PMuhBsAxK2o0JNpmYNV54vg AT mail DOT gmail DOT com>
 <CALSZ9groHntpQ+p7=4jo7BhDkAPA+EvAxhsqPpFp3CgHDeR6bw AT mail DOT gmail DOT com>
To: geda-user AT delorie DOT com
X-Mailer: Apple Mail (2.2098)
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id t5U8HJVh001668
Reply-To: geda-user AT delorie DOT com

Hi Rob,

I notice you’re using a PIC16F1937, which has an onboard LDO regulator.  These usually require a bypass capacitor on one of the VCap pins, but you haven’t got one and you’ve allocated two of the VCap pins to I/O functions.  This will probably cause issues — you’ll need to check the data sheet and review your configuration bits.

Regards,
Chris
—
Chris Smith <space DOT dandy AT icloud DOT com>


> On 29 Jun 2015, at 18:28, Rob Butts (r DOT butts2 AT gmail DOT com) <geda-user AT delorie DOT com> wrote:
> 
> I have decided to re-layout and re-fab my stepper driver test board.  I'm attaching the pdf schematics.  Is there anything I need to be especially careful about?
> 
> Thanks
> ​
> <stepper-driver-2-pg1.pdf><stepper-driver-2-pg2.pdf>