AM335x+TPS65910 I2C Timing

takeshi matsuzaki

Expert 2030 points

Other Parts Discussed in Thread: TPS65910, TPS65910A

Hello,
In case of using AM335x+TPS65910, these tow device communicate with I2C.

AM335x's data sheet says that MIN value of Tr&Tf of SCL, SDA is not defined.
Actualy we observed about 500ps of Tf of SCL which drived by AM335x.

TPS65910's data sheet says that MIN value of Tr&Tf of SCL, SDA is (20+0.1CL)ns.

Obviously the 500ps of Tf of SCL from AM335x violate the TPS65910 I2C's timing spec.

Is this acceptable for TPS65910 I2C ?

Regards,
Takeshi Matsuzaki

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

The AM335x+TPS65910A combination is designed to work together. There are no problems - hundreds of customers use this combination successfully.

0 takeshi matsuzaki over 11 years ago in reply to Biser Gatchev-XID

Expert 2030 points

Biser
Thank you for your reply.

But please focus on the the timing violation.
The Tf of SCL from AM335x violate the TPS65910 I2C's timing spec. (Yes/No ?)
Is this acceptable for TPS65910 I2C ? (Yes/No ?)

Regards,
Takeshi Matsuzaki

0 takeshi matsuzaki over 11 years ago in reply to Biser Gatchev-XID

Expert 2030 points

Biser
Thank you for your reply.

But please focus on the the timing violation.
The Tf of SCL from AM335x violate the TPS65910 I2C's timing spec. (Yes/No ?)
Is this acceptable for TPS65910 I2C ? (Yes/No ?)

Regards,
Takeshi Matsuzaki

0 Biser Gatchev-XID over 11 years ago in reply to takeshi matsuzaki

TI__Guru**** 393215 points

Nothing will be violated. The AM335X I2C interface is initialized at 100kbps, which is standard mode. There is no minimum Tr/Tf requirement in the TPS65910A datasheet for slave standard mode.

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AM335x+TPS65910 I2C Timing