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# Date Author Comment
76358a8a 11/09/2011 06:22 pm Abraham Levkoy

Turned on "always vector font" in Eagle options

While editing power test board, turned on the "Always vector font"
option in Eagle. Honestly, I might have done something else to the
silkscreen, but I can't remember what. I'm pretty sure I didn't mess
with any of the actual components.

cec2aa8e 11/07/2011 08:32 am Abraham Levkoy

Fixed silkscreen ugliness in power board

Went through layout and changed ugly names and values to good ones.
Moved text off of vias and pads and out from under things. Deleted
giant, useless USB port and ISP header labels. Added description, date
of design, and attribution in corner.

7a4f167f 11/07/2011 07:39 am Abraham Levkoy

Adjusted position of VUSB decoupling cap

b5b699df 11/07/2011 07:22 am Abraham Levkoy

Increased widths of several high-current traces

Mostly GND around charging circuit and gas gauge

2951343e 11/07/2011 06:06 am Abraham Levkoy

Decreased trace width between gas gauge resistors

Decreased width of trace between 49.9KOhm resistors in gas gauge voltage
divider to reduce noise.

d2b7d4f7 11/07/2011 06:02 am Abraham Levkoy

Widened battery and charger traces

Widened to 20 mils some traces that come from the battery and charger
connectors, because they carry higher currents.

f01b49cf 11/07/2011 05:46 am Abraham Levkoy

Added ground poly under charger IC

Added polygon under LT3650 IC and updated it to new device from kwoo
library. It now has effectively both a ground pad and a via. Slight area
of no contact right around via may be unavoidable.

38c9810d 11/07/2011 05:28 am Abraham Levkoy

Widened traces, moved gas gauge power supply

Widened traces that carry VBATT. Lined up decoupling capacitors for LDOs
with their connected LDO ports. Rerouted various traces ripped up during
execution of previous changes.

6328aca1 11/07/2011 04:29 am Abraham Levkoy

Rerouted decoupling caps and pullup around AVR

Rerouted decoupling capacitors and new pullup resistor around AVR to
increase trace width for power inputs and decrease unneccessary loops.

1637ab5d 11/07/2011 03:41 am Abraham Levkoy

Fixed USB circuit problems

Routed USB_TX and USB_RX more directly. Put decoupling capacitors on FTDI
chips closer to the inputs they decouple.

0b2acc15 11/06/2011 08:06 pm Abraham Levkoy

Changed center ground pad for DS2786 and LT3650

Changed ground pads for packages 10MSOP and 12TDFN to have through-hole
pads on the bottom instead of SMD pads. Updated power test board to use
the new DS2786. Drew a polygon of BATT_GND around center pad. Not sure...

1bc70a1f 11/06/2011 07:12 pm Abraham Levkoy

Updated power test schematic

Based on feedback from Kevin, added a pullup resistor to !PWR_INT and
decoupling caps to the LDO providing VCC.

Also changed the ground signal on the gas gauge LDO from GND to
BATT_GND. Kevin pointed out that having BATT_GND as the ground for the...

0f8a07ab 11/06/2011 09:40 am Abraham Levkoy

Minimized possible inductive loop in power board

Moved trace driving FAULTLED to minimize area of inductive loop in
vicinity of charger.

e5134b5f 11/06/2011 09:21 am Abraham Levkoy

Finished power board routing (first attempt)

Routed all signals on power test board. There are no airwires, and the
board passes DRC. I believe I have kept the inductive loops near the
charger pretty small, but they could probably be improved. I also made...

aa7ee9ae 11/06/2011 08:33 am Abraham Levkoy

Partially routed charger on power test board

Routed some of the signals connected to the charger IC on the power test
board.

d468084c 11/06/2011 08:07 am Abraham Levkoy

Routed gas gauge on power board

Routed signals attached to fuel gauge on power board.

1e62ac51 11/06/2011 03:40 am Abraham Levkoy

Started to route LDO signals

Started routing the signals attached to one of the LDOs.

ebfa6fb9 11/06/2011 03:10 am Abraham Levkoy

Finished routing AVR and FTDI, started pushbutton

Finished routing signals connected to AVR and FTDI on power test board.
Started routing signals attached to pushbutton controller.

8b6cb5d4 11/06/2011 01:56 am Abraham Levkoy

Routed USB circuit and most of AVR on power board

Routed most of the signals connecting the USB port, FTDI chip, and AVR.

1a5559b0 11/05/2011 10:46 pm Abraham Levkoy

Changed USB port drill holes back to spec

Looked at mini USB port with Dan. Observed that corner drill holes are
supposed to be multiple drills right next to eachother. Decided to
change holes back to specfied radius and ignore long hole for now.

30d533fe 11/05/2011 07:05 pm Abraham Levkoy

Preliminary power board placement complete

Placed all parts on power test board in what I believe will be their
approximate final locations. No routing done yet. Board probably won't
get bigger, because I left room to grow.

9180be39 11/05/2011 06:17 pm Abraham Levkoy

Partial placement of power board

Placed AVR, FTDI chip, and USB port on power test board, along with
their accessory components. They are probably pretty close to their
final resting place but may move a little bit later.

00c7cdb1 11/05/2011 05:29 pm Abraham Levkoy

Changed IO voltage for FTDI IC on power board

Changed VCCIO input for FTDI chip on power test board from USB_VCC to
internally generated 3.3V signal. This should have no power effects, but
Kevin suggests that it may make the chip behave a litte bit nicer (not...

344a6bf3 11/05/2011 04:00 pm Abraham Levkoy

Fixed ERC errors from unconnected wires

Some wires created in the previous few commits were not actually
connected to the pins they ended at. I fixed them.

13790121 11/05/2011 03:20 pm Julian Binder

Changed Schematic

Tied USB Shield pin to ground

168d92e6 11/05/2011 03:09 pm Julian Binder

Changed Schematic

Added activity LED's to the FT232 chip using the TXLED and RXLED pins

53d8e950 11/05/2011 03:00 pm Julian Binder

Changed Schematic Per Kevin Woo's Email

Changed U5 VSS from GND to VBATT_GND

Added GND PIN connection to ISP header

Switched USB_TX and USB_RX pins on the microcontroller to use the hardware
supported UART pins. Also switched TX and RX connections.

eed7abeb 11/05/2011 02:39 pm Julian Binder

Updated Schematic File

Added missing capacitor between Vin and GND in the charge circuit.

9b2f29ed 11/05/2011 02:14 pm Julian Binder

Fixed some schematic errors identified by the ERC.

Connected capacitor C12 which apeared connected but was actually
disconnected.

Approved error of VCC being connect to a power input

Added a missing junction

33c4366f 11/04/2011 06:10 pm Abraham Levkoy

Updated DS2786 footprint in kwoo library

Updated package footprint for DS2786 in kwoo.lbr based on recommended
land placement in datasheet for DFN10 package. DS2786's datasheet lists
TDFN10 as its package type but doesn't give placement guidance or a
useful package description. Unable to find a datasheet for TDFN10, but...

51b65a87 11/04/2011 05:09 pm Abraham Levkoy

Increased mini-USB plug drill hole size

Imported MINI-USB- device from Hirose Connectors library into kwoo
library. In UX60-MB-5S8 package, increased drill hole size on corner
pins from .8 mm to .9 mm. I did not drill out the original too-small
holes on Scoutfly, so I don't know whether this is sufficient or not....

fc0c916c 11/04/2011 03:12 pm Abraham Levkoy

Updated inductor package for power board

Created new package and device in library for MPI4040 inductor to be
used in power test board. Updated part on power test board.

109296da 11/04/2011 04:10 am Abraham Levkoy

Fixed GND pad on LT3650 charger IC

LT3650 package in kwoo.lbr had a polygon around a through-hole pad to
approximate a large SMD pad connected by a via directly to the ground
plane. Created a new package that is like this one but has no via, just a
normal SMD pad. Used this package in the power test board, which has no...

4327ce8c 11/04/2011 02:57 am Abraham Levkoy

Updated design rules for power board

Updated design rules for power board to match DorkbotPDX specifications.
This removed some of the DRC errors for the USB port and charger. The
charger still has a couple that may be from inherently illogical
package specification.

a7a07a86 11/03/2011 11:52 pm Abraham Levkoy

Disapproved DRC errors on power board

Disapproved of previously approved DRC errors for power board. They are
apparently legitimate problems that need to be taken care of.

072e0990 11/03/2011 10:32 pm Yuyang Guo

powerboard placed, needs routing

6bcd5b93 11/03/2011 05:28 am Abraham Levkoy

Fixed gas gauge and charging components

Added extra decoupling capacitor between battery voltage and ground next
to charging circuit to allow board to run with charger but no battery.
Connected system side of gas gauge sense resistor to GND to make all
current returning to battery go through sense resistor. Removed 0 Ohm...

cbe8706d 11/03/2011 03:34 am Abraham Levkoy

Added missing components around AVR on power board

Added ISP header, pullup resistor for AVR reset line, and decoupling
capacitors for AVR power lines. Connected ISP header to SPI interface on
AVR.

cb409f92 11/03/2011 02:37 am Abraham Levkoy

Finished USB interface on power board

Added decoupling capacitors to FTDI chip, changed signaling VCC from USB
VCC to AVR VCC so that AVR can signal to FTDI chip. Added USBTX and
USBRX signals between FTDI chip and AVR.

8c16f5aa 11/02/2011 07:15 pm Abraham Levkoy

Started to add USB port to power board

Added USB port and USB-UART converter to power board schematic. I think
the converter has enough hooked up to it to run without burning up, but
it's not hooked up the AVR yet.

107d33d7 11/02/2011 05:10 am Abraham Levkoy

Shorted GND to BATT_GND in power schematic

Connected GND and BATT_GND to eachother using a 0 Ohm resistor. I want
to keep the signals separate to ease routing, but they need to be
connected to ensure that all of the current that needs to go through the
fuel gauge sense resistor does so.

f6a93a04 11/02/2011 03:24 am Abraham Levkoy

Started making kwoo's recommended changes

Made changes to charging circuit: Connected CLP to VIN on U1. Added
diodes to charge BOOST capacitor from battery and provide current
sensing inductor with outlet if power turns off (don't really understand
how the latter works). Adjusted inductor to 4.7uH after re-calculating...

aa3e7f85 11/01/2011 03:13 am Abraham Levkoy

Update prefixes and names for two parts

Updated prefixes for DS2786 and MP1702 in kwoo.lbr to U so that Eagle
won't use the default prefix, U$, for them. Also manually updated names
in charging_test.{sch,brd}.

680676e5 10/27/2011 05:03 am Abraham Levkoy

Added pullup resistors and an LED to power test

Added pullup resistors for I2C connections to power test board. Also
added a diagnostic LED to indicate when the AVR has power. Still
probably needs an ISP header and USB controller/port.

0d19b5ca 10/27/2011 04:20 am Abraham Levkoy

First draft of power testing circuit schematic

Fleshed out power testing circuit. It is still missing a few things, and
I don't understand every little bit of it, but it probably won't look a
lot different when it's done. Added some passive components on the...