P82B715: Supporting Fast mode

user4109590

Prodigy 180 points

Part Number: P82B715
Other Parts Discussed in Thread: TCA9617B, TCA9509, TCA9517, P82B96

Hello E2E I2C Forum Members,

The max frequency of P82B715 is 400kHz. This is described in the parametrics table of TI web page.

But I don't know where it is described in the datasheet. Can P82B715 support 400kHz Fast mode really ?

Thanks,

Yasu

over 7 years ago

0 BOBBY over 7 years ago

TI__Guru 72751 points

Hello Yasu-san,

"Can P82B715 support 400kHz Fast mode really ?"

I did testing with this a while ago by providing a 400Khz waveform into an NMOS (link below). The testing showed it was possible to use this device at 400kHz though you will need strong pull up resistors if you expect there will be a lot of capacitance between the 'L' side of the device.

To be sure this is the right device for you application:

1) Can you tell me what application/end equipment you are designing?

2) Are you communicating across cables? If so how far and what kind of cable (cat 5?)?

3) What is your Vcc?

P82B715 is a device which I see as overkill for most applications and want to make sure this device is the right pick.

Thanks,

-Bobby

0 user4109590 over 7 years ago in reply to BOBBY

Prodigy 180 points

Hi Bobby-san,

Thanks for your quick reply! Yesterday, I visited our customer, and confirmed the details of their request.

The end equipment is the production printer, and they have plan to use 5m(max) USB cable. They know P82B715 has too much performance.

But they want to rise the noise immunity with high voltage level. Currently we recommend TCA9509, TCA9517, TCA9617B, TCA980x and P82B96(customer requested).

Thanks

Yasu

0 Miguel Robertson over 7 years ago in reply to user4109590

TI__Guru 62920 points

Thanks for following up! That all makes sense. Please just let us know if we can help further.

Max

Interface

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P82B715: Supporting Fast mode