TUSB7340: Overcur# pull up

na na78

Guru 16770 points

Part Number: TUSB7340
Other Parts Discussed in Thread: TPS2552

Our customer is considering of use of TUSB7340, and they have questions.

1. TUSB7340 has an internal pull-up at OVERCUR pins.

What is the value of its pull-up?

2. What is input threshold of OVERCUR?

Is it applied that the VIH and VIL in 3.3V IO Electrical Characteristics?

BestRegards

over 8 years ago

0 Elias Villegas M. over 8 years ago

TI__Guru* 76130 points

Hello,
1. PU value is around 220K.
2. Yes, use the values in Table 6.5 of the datasheet.
Regards

0 na na78 over 8 years ago in reply to Elias Villegas M.

Guru 16770 points

Hi Elias

Thank you for reply.

Sorry, let me confirm the pull up value again?

Unfortunately, OVERCUR line is pulled down by other IC with 10kohm in the customer's design.

The customer says the voltage at Overcur indicates 2.2V in normal operation.

(The fault of TPS2552 is open-drain in default)

So, if TUSB7340 has 220K pull-up resister, it seems too large.

Could you please check PU value again?

BestRegards

0 Elias Villegas M. over 8 years ago in reply to na na78

TI__Guru* 76130 points

Hello,
My mistake, I used a wrong value for the input current, the correct PU values is around 15K.
Regards

0 na na78 over 8 years ago in reply to Elias Villegas M.

Guru 16770 points

Hi Elias

Thank you for your reply.

I understood the I_OZP value on the datasheet is applied to not only GRST and GPIO but also OVERCURE as well.

Do you have information about the tolerance of pullup resistor?

BestRegards

0 JMMN over 8 years ago in reply to na na78

TI__Guru 60870 points

Hello,

The typical tolerance is +/-20%.

Regards,
JMMN

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TUSB7340: Overcur# pull up