A bit more board design stuff:
Regarding connectors - I've found a way to use the one thingstodo linked a couple of posts ago.
They have a board to case measurement of 15mm. If the LEM current sensor is replaced with the Tamura version, it will fit. The Tamura sensor is only 11mm thick.
http://www.tamuracorp.com/clientuplo...L08PXXXD15.pdf
They're also quite a bit cheaper, at about $16 vs $25
I've counted the I/O connectors on the current design. With integrated current sensors and on-board drivers, 32 I/O pins are needed. The AMP 35 pin connector will work fine:
1-776231-1 TE Connectivity / AMP | Mouser
This leaves the controller, which ironically costs less than the I/O connector.
There are two series of controllers that could do the job - the 5015/5016 and the 6010A/6015. The main difference between the series is about 2X the memory, an extra CAN bus and $2 for the 6000 series. I've looked through the pins for all four, and it would be possible to make a pin-compatible 64 pin or 80 pin controller board between the 5000 series and 6000 series.
The big difference between the models in each series is the pin count - 64 vs 80. The extra pins don't really cost any more. In fact the 80 pin 6010A costs less than the 6015. The 80 pin ucontroller is only slightly bigger, with the same pin spacing. I think there would be no advantage to soldering the smaller one. On the other hand, the critical stuff - PWM and analog input - are virtually the same. The main difference is digital I/O connections.
Thoughts?
- E*clipse