I2C High speed Adapter ( 1MHz and above)

[ashwin.rao@maximintegrate]

Hi ,

I am looking for i2c master adapter which supports 1Mhz speed or above with no clock stretching and no delay between inter bytes or inter bits ?

i checked with Total Phase and their adapter doesn't support more than 800kHz.

 

[tantalos]

I2C isn't specified for speeds above 1MHz.

 

[GrandAlf]

Tantalos is correct on this. Originally a low speed bus used for data transfer in consumer electronics. USB is a faster variant but protocols may not suit your requirements.

 

[wp100]

Hi,

Seems you can do super hi speed I2C according to this, however doubt you will want to pay that price ..
https://www.telos.de/traciixl20/

Also begs the question as to what device you want to connect the master to and if they can handle that speed ?

What about distance, on or off board ?

Any reason you could not use SPI or USB ?

 

[Easyrider83]

There is no problem to make it works even for 10Mhz, if both devices support this speed and fall/rise times is small enought. The maximum I2c speed specified by formula t=r*c, where r - pullup resistance and c - line capacity. You can use 100 Ohm pullup resistors, if your devices output logic allow this and the 1Mhz speed will not be a problem.
I tryied to run i2c for 800Khz clock with 1.5k pullup whith MPU6050 accelerometer. It works.

 

[paulfjujo]

hello,


New EEPROM 24FC1026 are designed for I2C 1MHz !
but MCU must follow...