HD3SS3220: Recommended external resistor range for DIR, ID, INT_N, VCONN_FAULT_N

Takahiro Saito

Expert 5455 points

Part Number: HD3SS3220

Hi team,

What is the recommended external resistor range for DIR, ID, INT_N, VCONN_FAULT_N?

Customer wants to use 220kohm resistor instead of 200kohm.

Regards,

Saito

over 5 years ago

0 Malik Barton57 over 5 years ago

TI__Guru 64326 points

Hi Saito-san,

220k is also workable value for HD3SS3220. Resistor should be sized to meet the minimum VOL listed in datasheet.

0 Takahiro Saito over 5 years ago in reply to Malik Barton57

TI__Expert 5455 points

Hi Malik-san,

Sorry for reopen the thread. Could you explain me why 220kohm should be okay for normal operation?

Why does the datasheet set the 200kohm (nom) pull up resistor for these pins?

Regards,

Saito

0 Malik Barton57 over 5 years ago in reply to Takahiro Saito

TI__Guru 64326 points

Hi Saito-san,

HD3SS3220 open drain operate such that the voltage on the pin is pulled to GND when a certain state is asserted. The weak pull up is installed on the pin to show the de-asserted state. Since 220Kohm is weaker than 200 Kohm, HD3SS3220 can pill the pin down when pull up is installed. Does this answer your question.

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HD3SS3220: Recommended external resistor range for DIR, ID, INT_N, VCONN_FAULT_N