jim940 28 Posted April 30, 2012 Share Posted April 30, 2012 Well this is the minimalist version, the LaunchCAN still needs to be finalized in my head. None the less this one is probably what would interest people the most. If you catch any errors let me know. Pins currently used: 1 - CAN Bus Interrupt Pin 7 - UCB0 CLK 14 - UCB0 SIMO 15 - UCB0 SOMI 16 - RESET 18 - STE for MCP2525 19 - AutoBaud feature of TI SN64HVD235 And the BOM of course: [*:3u4zlitu]Microchip MCP2515 CAN Controller (MCP2515-E/SO).[*:3u4zlitu]TI SN64HVD235 CAN Transceiver (SN65HVD235D).[*:3u4zlitu]16Mhz Crystal[*:3u4zlitu]2x 22pf Capacitors[*:3u4zlitu]0.1uF Capacitor[*:3u4zlitu]5x2pin Male Header (conforming to CANopen spec's for DE-9 Connection)[*:3u4zlitu]Phoenix 1923898 Socket (CANopen type)[*:3u4zlitu]2x 10pin Female Headers You'd also need a Phoenix 1911994 Terminal block to mate with the socket. Jim Booster.brd bluehash 1 Quote Link to post Share on other sites
bluehash 1,581 Posted April 30, 2012 Share Posted April 30, 2012 An LED would be nice.. visual indication that the board has power. Quote Link to post Share on other sites
jim940 28 Posted April 30, 2012 Author Share Posted April 30, 2012 Something like this? Jim Booster.brd Quote Link to post Share on other sites
jim940 28 Posted April 30, 2012 Author Share Posted April 30, 2012 On Second thought ... in case you don't want to be wasting power. Booster.brd bluehash 1 Quote Link to post Share on other sites
bluehash 1,581 Posted May 1, 2012 Share Posted May 1, 2012 Looks good jim. good idea on the solder jump. Quote Link to post Share on other sites
jim940 28 Posted May 1, 2012 Author Share Posted May 1, 2012 The MSP is low power, so might as well try and keep our boosters from being power hogs with LED's hence why I left LED's out in the first place. Anyways here is the Schematic. Also added a termination resistor in case this is the last node in a line and you wanted something more permanent then Jerry rigging the resistor on the outside of the open connector. Jim booster.sch booster.brd Quote Link to post Share on other sites
oPossum 1,083 Posted May 1, 2012 Share Posted May 1, 2012 Quick route of PCB... - Ground plane - Short traces for xtal - Thicker traces for power - Room for more stuff booster.brd booster.sch SugarAddict, bluehash and jim940 3 Quote Link to post Share on other sites
jim940 28 Posted May 5, 2012 Author Share Posted May 5, 2012 Added a power supply 9 to 72V and it has a switch now to select whether the input is from the 2x5 header or the terminal connection. I hand routed it in this time oPossum Might be over kill and its a tad pricy but the 78XX compatible regulator I'm looking at is: V7803W-500R ( http://search.digikey.com/us/en/product ... ND/2757923 ) So you can put in from 9 to 72 V and its all self contained, just used the regular 78XX footprint from the library though so I'm thinking that hole really isn't needed but that is okay I think. The regulators data sheet says to place a diode above as I did in the schematic for over voltage protection. So added that as well. But getting some errors I don't know what they mean after I installed the SeeedStudio DRC packages. :S Jim booster.brd booster.sch Quote Link to post Share on other sites
TomKraut 17 Posted May 5, 2012 Share Posted May 5, 2012 First you say LEDs are power hogs, then you add a 75V to 3.3V linear regulator? Something doesn't add up Have a look at the LM5007 Step-Down regulator. WEBENCH is acting up for me right now, but there may be a reference layout for this. And if not, you might be able to get your hands on the gerbers for the eval kit. Cheers TomKraut Quote Link to post Share on other sites
jim940 28 Posted May 6, 2012 Author Share Posted May 6, 2012 Tom, Its not a linear regulator, its just in a package suitable for use in where a 78XX type linear regulator would fit. It has a efficiency level of 82% when you input only 9V on the 3.3V version, and goes up from there the higher the input voltage. Most of my Web Bench designs were not that much better, and tended to be more limited on input voltage options. Jim Quote Link to post Share on other sites
TomKraut 17 Posted May 6, 2012 Share Posted May 6, 2012 I see. In that case, forget what I said. I should have opened that datasheet first... Quote Link to post Share on other sites
RobG 1,892 Posted May 6, 2012 Share Posted May 6, 2012 ...But getting some errors I don't know what they mean after I installed the SeeedStudio DRC packages. You can "Approve" Stop Mask errors or just hide layer 29 & 30. Quote Link to post Share on other sites
jim940 28 Posted May 6, 2012 Author Share Posted May 6, 2012 But it should work with SeeedStudio none the less? Jim Quote Link to post Share on other sites
RobG 1,892 Posted May 6, 2012 Share Posted May 6, 2012 Yes, it will. Quote Link to post Share on other sites
jim940 28 Posted May 6, 2012 Author Share Posted May 6, 2012 Thanks RobG, will send in the order tonight then! Jim Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.