TUSB1210: CPEN Pin

Jason Ciou

Part Number: TUSB1210

Hi team,

My customer has a question about CPEN pin,

in the datasheet page 51, why the open drain mode need to add pull down resistor, if adding the pull down resistor to ground the voltage on CPEN pin should be 0V right?

over 4 years ago

0 Brian Zhou over 4 years ago

TI__Guru*** 146055 points

CPEN_ODOS should be 1 and CPEN in CMOS mode. No need PU or PD.

Regards

brian

0 Jason Ciou over 4 years ago in reply to Brian Zhou

TI__Expert 3600 points

Hi Brian,

What does the pull-down resistor on CPEN mean?
For open drain, if I need get the high, I use pull up resistor, why datasheet said it should be use pull down resistor?

+1 Brian Zhou over 4 years ago in reply to Jason Ciou

TI__Guru*** 146055 points

when CPEN_Od is 1 , it's configured as PMOS . so a PD is needed.

When CPEN_Od is 0 , it's configured as NMOS . so a PU is needed.

when CPEN_ODOS is 1, It's configured as CMOS, no PU or PD needed.

0 Jason Ciou over 4 years ago in reply to Brian Zhou

TI__Expert 3600 points

OK , I got it.
Thanks

Interface

Interface forum

TUSB1210: CPEN Pin