chicken 630 Posted January 26, 2014 Share Posted January 26, 2014 As discussed in this thread, I took a first stab at a Booster Pack for the 1.35" SHARP Memory Display. As suggested by @@greeeg, I added two footprints: FPC connector (on the back) zebra strip connector (on the front) While the outline is for the 1.35" variants (LS013B4DN01, LS013B4DN02, LS013B4DN04). The 1.28" (LS013B7DH03) and 1.26" (LS013B7DH01) displays should work too as the FPC cables are of similar length and zebra footprints are identical. The smaller, circular displays might work, but the length of the FPC cable might be too short. The larger displays have the same FPC cable, but will overlap with the LaunchPad connectors. I could fit the next size up (2.7", LS027B7DH01) when rotating the screen 90 degrees. I only supply 3.3V. The current small-sized displays are all 3.3V. The older 1.35" versions specify 5V supply voltage, but in my experience work fine with 3.3V. I don't know about the larger displays. Connections are as follows: SCLK -> P1.5 (SPI CLK) SI -> P1.7 (MOSI) SCS -> P2.5 (SPI CS) DISP -> P2.0 (display on/off) I did go with the BoosterPack recommendations for SCS and DISP, but I'm considering to put them somewhere on the upper 14 pins to maintain compatibility with my original code which was for the MSP430G2231. Not yet connected are EXTMODE and EXTCOMIN. These are to control how the LCD polarity-toggling is driven. If EXTMODE is high, toggling is done through EXTCOMIN, otherwise it's done through SPI. I might pull EXTMODE low with a resistor and expose jumper pads to change the configuration. I filled the front plane with 3.3V and the back plane with GND. The horizontal shape at right below the zebra strip pads is the cutout for the flex cable. Any input is greatly appreciated. yosh 1 Quote Link to post Share on other sites
bluehash 1,581 Posted January 26, 2014 Share Posted January 26, 2014 @@chicken, Thanks. Not yet connected are EXTMODE and EXTCOMIN. These are to control how the LCD polarity-toggling is driven. If EXTMODE is high, toggling is done through EXTCOMIN, otherwise it's done through SPI. I might pull EXTMODE low with a resistor and expose jumper pads to change the configuration. In such a case I find general GPIOs, and connect to the pins via a solder jumper. The SDCard boosterpack has this feature and it is prejumpered when the PCB is made, so the user has to cut the trace between the jumper in case the pin needs to be used for something else. It helps keep the code synced with hardware, without any configuration to the hardware. Just a tip. Looking at the renderings, I don't see 40 pin boosterpack support. The extra header can be "dumb", but will help in stacking. Quote Link to post Share on other sites
chicken 630 Posted January 27, 2014 Author Share Posted January 27, 2014 Good points @@bluehash. What does the footprint of the 2 and 3 way solder jumpers look like? I might have to make one myself for Kicad. Quote Link to post Share on other sites
chicken 630 Posted January 27, 2014 Author Share Posted January 27, 2014 Attached the updated version. - added 2nd header rows for 40 pin booster pack support - added solder pads for all connections - added 3-way solder pad for selecting EXTMODE (software or hardware) - added 3-way solder pad for 3.3V vs 5V supply voltage selection - moved slot for FPC further down, 1st attempt got some cable lengths wrong yosh 1 Quote Link to post Share on other sites
bluehash 1,581 Posted January 27, 2014 Share Posted January 27, 2014 @@chicken Awesome! Looks just as I suggested. Let me know when you are ready. If others do not have any suggestions, we can go ahead and make an order. Let me know when ready. Quote Link to post Share on other sites
chicken 630 Posted January 27, 2014 Author Share Posted January 27, 2014 Is there a KiCad library with 43oh artwork i could add to the top silkscreen? There's plenty of empty space. Quote Link to post Share on other sites
bluehash 1,581 Posted January 27, 2014 Share Posted January 27, 2014 @@spirilis has some. He uses KiCad. Quote Link to post Share on other sites
spirilis 1,265 Posted January 27, 2014 Share Posted January 27, 2014 I use DipTrace... (tried kicad and quit out of frustration) Sent from my Galaxy Note II with Tapatalk 4 Quote Link to post Share on other sites
luke 9 Posted January 27, 2014 Share Posted January 27, 2014 Can we pre-order now based on an approx (or even unspecified) price? I imagine a new booter like this will be popular. Quote Link to post Share on other sites
bluehash 1,581 Posted January 27, 2014 Share Posted January 27, 2014 Oops.. yes. Spirilis uses diptrace, which prompted me to try it out. I like it, compared to Eagle. @@chicken, just put 43oh text if you want. @@luke If chicken is ok with the design. I can go ahead an order it. I think at price, it will be around $3.50 shipped. Quote Link to post Share on other sites
chicken 630 Posted January 27, 2014 Author Share Posted January 27, 2014 I don't know about pre-orders, I wanted to spin it via OSHPark first to verify that it actually works - but then, that will cost me twice of 10 boards from Seeed et al. Might just as well risk a small production run. As for price, the cost structure is as follows: - PCB ~5x5cm/2x2" $1 - 3 decoupling caps <$0.1 - FPC connector $1.15-$1.50 - Stackable headers $0.5? - Display $12-$18 I don't know what @@bluehash has in mind. As the display is 80% of the cost, it might make more sense (less risky) to just sell the populated board without the display. However availability of the display might be an issue. Currently I can only find it at Mouser. Also of note, breakout boards with display sell for $38-40. Quote Link to post Share on other sites
bluehash 1,581 Posted January 27, 2014 Share Posted January 27, 2014 I think Luke meant just the PCBs. You have $10 from 43oh. I think China is in holiday mode now. So OSHpark would be better. Quote Link to post Share on other sites
spirilis 1,265 Posted January 27, 2014 Share Posted January 27, 2014 Yeah as a general rule I don't prefer OSHpark over Elecrow if the price difference per-board is dramatic... the main advantage OSHpark has imo is the copper seems better cemented, I think they use better stock for their boards to survive RoHS solder rework et al, it's very hard to lift pads with re-soldering 'n stuff. I've lifted pads off Elecrow boards like they were scotch-taped. But during the Chinese holiday and some short weeks after (cause they'll probably be busy with backlogs), OSHpark has the advantage. Quote Link to post Share on other sites
chicken 630 Posted January 28, 2014 Author Share Posted January 28, 2014 Some final cosmetic edits: - added 43oh logo - reduced width by 1mm to fit within 5cm - nudged a few traces around for better plane fill-in - rotated EXTMOD jumper to same orientation as the others I think it's ready to go. yosh 1 Quote Link to post Share on other sites
bluehash 1,581 Posted January 28, 2014 Share Posted January 28, 2014 @@chicken Add your name or forum name and version too. Also add the board name. Quote Link to post Share on other sites
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