TAS2521: SDA sink current

Takuya Terada

Expert 4925 points

Part Number: TAS2521

Hi team,

my customer would like to use TAS2521.

and they have question about SDA sink current.

could you tell me how much SDA sink current TAS2521 can drive?

best regards,

Takuya

over 4 years ago

0 Luis Fernando Rodriguez S. over 4 years ago

TI__Guru* 84915 points

Hi, Takuya,

Our team will take a look at this thread and will reply as soon as possible.

Best regards,
Luis Fernando Rodríguez S.

0 Ivan Salazar over 4 years ago

TI__Guru** 102515 points

Hi Terada-san,

Customer can use the suggested 2.7kOhm pull-up resistors for I2C bus lines.
Unfortunately there is no sink current spec for any pin at the device spec.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Takuya Terada over 4 years ago in reply to Ivan Salazar

TI__Expert 4925 points

thank you for your support.

Customer consider to use lower resistance than 2.7 kOhm.

that is why they want to know the sink current spec.

Is it possible to test or something to get sink current spec?

best regards,

Takuya

0 Ivan Salazar over 4 years ago in reply to Takuya Terada

TI__Guru** 102515 points

Terada-san,

Without spec data we can only guess values and test. How low resistance is customer planning to use?
In the meantime I'll check if there is any internal resistor value data, as sink current data is most likely not available.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Takuya Terada over 4 years ago in reply to Ivan Salazar

TI__Expert 4925 points

Hi Ivan,

thank you very much for your support.

Customer consider to use 2.2kOhm resistor, but it may be changed.

best regards,

Takuya

0 Ivan Salazar over 4 years ago in reply to Takuya Terada

TI__Guru** 102515 points

Hi Takuya-san,

I can try 2.2k in the lab and provide results early next week at the latest. I'll also let you know if can find any data related.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Takuya Terada over 4 years ago in reply to Ivan Salazar

TI__Expert 4925 points

Hi Ivan,

thank you for your support.

>>I can try 2.2k in the lab and provide results early next week at the latest.

thank you very much. and if possible could you test lower resistance also?

because they may change lower resistance depending on the result of test that panasonic will conduct.

best regards,

Takuya

0 Ivan Salazar over 4 years ago in reply to Takuya Terada

TI__Guru** 102515 points

Takuya-san,

Let me get back to you with the results by the end of this week.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Takuya Terada over 4 years ago in reply to Ivan Salazar

TI__Expert 4925 points

Hi Ivan,

thank you for your support.

ok!

and customer would like to know the test result of 1.5kΩ and 1kΩ also. ( pull-up voltage is 3.3V)

i am looking forward to the result!

best regards,

Takuya

0 Ivan Salazar over 4 years ago in reply to Takuya Terada

TI__Guru** 102515 points

Hi Takuya,

Thanks for the notice. I expect to test this today or tomorrow, I'll tabulate the results and let you know.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Takuya Terada over 4 years ago in reply to Ivan Salazar

TI__Expert 4925 points

Hi Ivan,

Have you got the test result?

best regards,

Takuya

0 Ivan Salazar over 4 years ago in reply to Takuya Terada

TI__Guru** 102515 points

Takuya-san,

Sorry the delayed results. This will be tested today afternoon, will let you know the results at evening.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Ivan Salazar over 4 years ago in reply to Ivan Salazar

TI__Guru** 102515 points

Hi Takuya-san,

I just tested for pull-up resistor down to 1kΩ and IOVDD = 3.3V, the results are that the device is working OK.

Please let me know if you have any further questions.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Takuya Terada over 4 years ago in reply to Ivan Salazar

TI__Expert 4925 points

Hi Ivan,

thank you very much for your support.

best regards,

Takuya

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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TAS2521: SDA sink current