BQ25120F3A: Regarding BQ25120F3A I2C Parameters.

Mahesh Malyam

Part Number: BQ25120F3A

Tool/software:

My Fall time of the I2C is too fast and as i was going through the Datasheet i haven't found any parameters of fall time in the datasheet. Fall time of sda is 2.4ns and SCL is 1.8ns.
Clock speed is 387khz.
Is the above fall time is okay ? I don't see any issues with communication level wise but for Validation testing i find it as a problem.
I have attached the waveforms below.

1 month ago

+1 Juan Ospina 1 month ago

TI__Genius 13235 points

Hi,

These rise and fall times should be ok for this device. The clock speed is as well.

Best Regards,

Juan Ospina

0 Mahesh Malyam 1 month ago in reply to Juan Ospina

Prodigy 60 points

Hi Juan,

I have one more concern on I2C Hold time(BQ doesn't have hold time parameters in datasheet)So I referred to NXP I2C parameters datasheet.
Here in the data sheet it says it should be more than 300ns, But I see 230ns as data hold time.

Is this condition of hold time 230ns is okay?

Regards,
Mahesh.

+1 Juan Ospina 1 month ago in reply to Mahesh Malyam

TI__Genius 13235 points

Hi Mahesh,

Can you clarify which hold time this is? (tHD;STA, tHD;DAT, or other?). If it is Data hold time, there doesn't seem to be a Min/Max specification so it would probably be ok. If it is a STArt hold time then the minimum specification is 0.6 uS at 400kHz clock rate so this might be a bit fast. Unfortunately, I'm not sure if that hold time is sufficient for this device specifically.

Best Regards,

Juan Ospina

0 Mahesh Malyam 1 month ago in reply to Juan Ospina

Prodigy 60 points

Hi Juan,

It is Data hold time which is 230us.
Start hold time we see 0.645us that is okay.
Thanks for your help, This resolves my issue, Closing the ticket

Regards,
Mahesh

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BQ25120F3A: Regarding BQ25120F3A I2C Parameters.