Other NXP ProductsのトピックRe: I2C fall time

I2C fall time

军颖肖 — Thu, 22 Nov 2018 08:15:20 GMT

how to change I2C bus fall time? Now I use fast mode 400Kbit/s, fall time is very fast, and cannot meet the UM10204 SPEC demand. I simulated the circuit by hyperlynx, but adding series resistor seems not well. Thanks a lot.

Re: I2C fall time

guoweisun — Fri, 23 Nov 2018 04:33:41 GMT

Hi,

If don't down the speed,only method to increase fall time is enlarge the pull up resistor.

Re: I2C fall time

军颖肖 — Fri, 23 Nov 2018 06:54:01 GMT

guoweisun‌ I have verified pull up resistor has almost any influence on fall time.

Re: I2C fall time

guoweisun — Sun, 25 Nov 2018 23:34:44 GMT

Hi,

Do you accept slow down you IIC speed?

Re: I2C fall time

军颖肖 — Wed, 28 Nov 2018 08:36:57 GMT

Could you please explain it more clearly? I don't understand why speed has relationship with fall time. Thanks a lot.

Re: I2C fall time

军颖肖 — Wed, 28 Nov 2018 08:38:05 GMT

My phone number 18611760398, I am glad to have a talk with you.

Re: I2C fall time

guoweisun — Fri, 30 Nov 2018 05:50:57 GMT

Already give you call and clear your question

Re: I2C fall time

军颖肖 — Fri, 30 Nov 2018 07:36:44 GMT

Mr Sun，thanks a lot.