SN65HVDA1050A-Q1

Hi Ben-san,

Will you be performing the powered DUT testing per ISO 10605?

If so, the SN65HVDA1050A-Q1 device will require external protection to pass at these levels. I recommend placing a NUP2105 or a MMBZ27 from On-Semiconductor as close to the connector on the board as possible (D_ESD below). In addition, additional bus capacitance will help as well (C_BUS below) .

Depending on whether or not this node will be a terminated node, you can do the active split termination as shown above.

As with all ESD events, the layout of the board is very critical to the performance of the system. ESD events are very high frequency events and therefore proper high frequency board layout practices should be followed.

Thanks,

John

Also, we have a next generation CAN transceiver family HVDA551/553-Q1 with enhanced ESD and transient protection built in.  Again this is a system level test and depends on the PCB, Connector, Board Design, Cable assumptions so PCB and external protection options should be planned.  These devices have passed some system level testing requirements for ISO 10605 at certain customers without external protection. 

-- Scott

Hi  John-san

Thank you for  reply.

My question is  that  SN65HVDA1050A-Q1  has followed up  ISO10605.

Your  follow  is  answered.

Only device be not  followed  ISO10605.

Your advice will be  follow  circuit  that support  ISO10605.

It  was  very good  support .

Thank   BEN.
 

Hi Ben,

The datasheet recommends that the differential voltage on the bus pins stays within ±7 volts. Therefore, for the condition that you are describing, where there is a fault with a 67 volt (+40 - -27) differential input on the bus pins, the datasheet parameters may not be valid.

Specifically I think the input leakage current for the receiver will be out of spec. With that being said I do not think that this condition should cause any damage to the device. The minimum differential input resistance for the device is 30kΩ, which means that at 67V differential the device should only be sinking at most 2.2mA. This should not cause any issues.

Thanks,

John

Also, keep in mind unless you have 2 or more power supplies in the system is it impossible to get such an odd combination.  The -27 to +40V spread would assume 5 faults all at the same time from an automotive viewpoint:

1) CANH shorted to one power supply

2) CANH power supply at load dump (40V)

3) CANL shorted to a separate power supply

4) CANL power supply reverse polarity

5) CANL power supply a double battery

-->  not very likely.  The device will take it but a very non typical case.

-- Scott