SN65HVDA195-Q1 / Master Node

K.Yaita

Hi Team,

Typical application shows 1kΩ pull-up for Master Node.
Can my customer use the pull-up resistor more than 1kΩ? (2kΩ etc.)

Best Regards,
Yaita / Japan disty

over 9 years ago

0 Miguel Robertson over 9 years ago

TI__Guru 62920 points

Yaita-san,

The device will still function properly with larger-valued pull-up resistances, but the 1-kOhm pull-up resistance is required at the master node per the LIN specification.

Best regards,
Max

0 K.Yaita over 9 years ago in reply to Miguel Robertson

Guru 29720 points

Hi Max-san,

Thank you always for your support.
I would like to ask an additional question.

It seems Figure10 and Figure13 are inconsistent connection for Master node.
Which is a correct figure?

Best Regards,
Yaita

0 Miguel Robertson over 9 years ago in reply to K.Yaita

TI__Guru 62920 points

Yaita-san,

It looks like Figure 13 is correct. The master node should have a pull-up resistance (with series diode) from the LIN pin to VSUP (pin 7)

Max

0 K.Yaita over 9 years ago in reply to Miguel Robertson

Guru 29720 points

Max-san,

I really appreciate for your quick reply.
Could you modify Figure13 in next version of datasheet?

Best Regards,
Yaita

0 Miguel Robertson over 9 years ago in reply to K.Yaita

TI__Guru 62920 points

Yaita-san,

Yes, we will be sure to update this figure in the next revision. Thank you for bringing it to our attention.

Best regards,
Max

0 vinod sharma over 9 years ago in reply to Miguel Robertson

Intellectual 450 points

Hi,

I think both the figure are OK.

Connecting pull up series Diode-Resistor to INH pin give an option to reduce power dissipation when micro detect permanent dominant level on LIN pin i.e ground short circuit. In that case series diode-resistor be disconnect by switching transceiver to Low power mode which minimize the power dissipation in fault conditions.

regards

Vinod

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SN65HVDA195-Q1 / Master Node