SN65HVD234
Hi,
I would like to know why SN64HVD234 is rated as compatible and not compliant to ISO11898-2. What are differences Compatible Vs Compliant for the SN64HVD234, 3.3V CAN device.
Thanks
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SN65HVD234
Hi,
I would like to know why SN64HVD234 is rated as compatible and not compliant to ISO11898-2. What are differences Compatible Vs Compliant for the SN64HVD234, 3.3V CAN device.
Thanks
Hi Sidat,
The 3.3V CAN parts are designed with the ISO 11898-2 (-5) spec in mind but a 3.3V device simply cannot meet all of the requirements that are required by a 5V spec to be compliant. We try to meet every parameter that we can from the ISO 11898 spec with a 3.3V device but there are simply some that we cannot. For example here the ISO 11898-2 2016 spec specifies that CAN_H have a nominl value of 3.5V and a maximum value of 4.5V which is unacheivable in a 3.3V design.
This is why a device can be compatible but now compliant. Please let me know what other questions you have?
Hi Henry,
ISO 11898-2 was developed for 5V automotive systems and does not include any 3.3V requirements. When we say "compatible with ISO 11898-2" we are saying that the 3.3V part(s) are designed to meet as many of the ISO specs as possible but there are some that we simply cannot meet due to the 3.3V supply. For example Vcm in CAN is typically Vcc/2 or 2.5 for 5V CAN but with 3.3V CAN devices this is hard to due. You can see the typical recessive level for the SN65HVD234-Q1 is 2.3V so we "try" to meet all of the specs.
There are some OEMs that have discrete 3.3V networks in their communication hierarchies and require this 3.3V Q1 devices which is why we have it. The SN65HVD234-Q1 has a full automotive CAN qualification just like any other Q1 part from TI.
Please let me know if you have any more questions?