Which CAN controller for DeviceNet

Question

If you were going to pick a CAN controller for a non-trivial DeviceNet product (probably want to support UCMM), what sort of controller would you pick?

1) Enhanced basicCAN (e.g. SJA1000/PeliCAN), where the rx queue allows for higher latencies, but SW must do filtering.
2) FullCANN (e.g. 82527) which does more filtering but requires lower latencies.

Have I correctly identified the tradeoffs between the two?

Is an SPI interface device like the Microchip 2515 suitable for a full-featured Devicenet node?

Kevin Kramb · Accepted Answer

There are a few pages regarding CAN controller selection in the "CAN and DeviceNet" chapter of the DeviceNet Technical Overview at

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This may not answer you specific questions but could be helpful otherwise.

I'm not familiar with the 82527. The SJA1000 has some nice features in PeliCAN mode. There is a "listen only" mode which is useful for automatically detecting the DeviceNet baud rate. And there are some test features. There is a Philips application note that explains these features in more detail.

-- Kevin

Andy Sinclair · Answer

It very much depends on the number and type of messages you are going to receive. If you are receiving a limited number of messages a device like the 82527 can be very useful. You can configure the masks so that each message you are interested in goes to a different buffer and can be serviced at your leisure.

Andy

Which CAN controller for DeviceNet

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