Connect One Ethernet shield

[dhouston]

Am I right in that you have the SPI pins on the ConnectOne module connected to the MSSP module on the AMICUS18 so that it can use that interface instead of the bit-banged serial?

As I responded earlier, all pins are accessible and the user can route them as desired. However, I need to add the caveat that they should only be connected to a 3V3 device. While I have added the LDO and have added circuitry needed for level conversion on the TX, RX & RESET, I will not be adding level conversion to the other lines, not even SCL & SDA used for the I2C bus so these features will need a 3V3 system. There's just not enough real estate on these boards for the additional circuitry.

[dhouston]

Never mind - I had not thought the 5V-to-3V3 conversion through. While 5V-to-3V3 conversion is straightforward, things get complicated when trying to use the same circuitry in a 3V3 system - it requires far too many jumpers. Adding to that are the other pins on some of the ConnectOne modules, SPI, RMII, etc. which complicate things even further.

So I'll just go back to a silkscreen warning that the ConnectOne shield is 3V3 only. It will work with the Amicus18 and other compatibles with 3V3 system voltage.

OTOH, the Tibbo ethernet shield is easy to use with either voltage, requiring only a single jumper to select the system voltage so I will add an LDO regulator to that PCB.

An interesting side note is that the Arduino Uno reference design shows optional 5V and 3V3 regulators so there are probably a lot of Arduino compatibles that are 3V3.