BQ2022A: SDQ pin question

AJ Cheng

Part Number: BQ2022A

Dear Sir.

As shown in the figure: The SDQ pin in the line has a 100R resistor. Please help confirm the following problem.

1. What is the specification of the resistance value range (minimum and maximum values) that the resistor R1 matches with the chip?

2. Can I replace it with other resistance values? For example, is it possible to directly connect 220R or 300R or not?

3. What is the impact of the resistance on the chip? The bigger the resistance are better or the smaller are better?

over 5 years ago

0 Onyx Ahiakwo over 5 years ago

TI__Guru* 76230 points

hi Aj
I would not recommend you change that value as that was what was verified to be fully functional during device tests. That resistor is a current limiter to mitigate esd into that pin since the sdq will be connect to the system, possibly via a connector.
thanks
Onyx

0 AJ Cheng over 5 years ago in reply to Onyx Ahiakwo

Genius 3615 points

Dear Onyx.

Good day.

Thank you for your reply. I saw two 100 Ohm on the BQ2022A EVM are R2 and R6. Do we need to use one or two 100 Ohm?.

What else should we need pay attention to in design? Thank you for kindly help~.

0 AJ Cheng over 5 years ago in reply to Onyx Ahiakwo

Genius 3615 points

Dear Onyx.

Good day.

Thank you for your reply. I saw two 100 Ohm on the BQ2022A EVM are R2 and R6. Do we need to use one or two 100 Ohm?.

What else should we need pay attention to in design? Thank you for kindly help~.

0 AJ Cheng over 5 years ago in reply to Onyx Ahiakwo

Genius 3615 points

0 Onyx Ahiakwo over 5 years ago in reply to AJ Cheng

TI__Guru* 76230 points

Hi AJ

We typically use 2 100 ohm on our EVMs to mitigate positive and negative esd currents. If you use an actual esd diode instead of a zener, then one can be used.

thanks

Onyx

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BQ2022A: SDQ pin question