UCD9090A: Are there shoud be stretches in the I2C clock if I use my own code to access the ucd9090a?

Hey ,all 

thank you in advance.

While I'm accessing the ucd9090a via  I2c interface  which is also its programing interface   . 

I could program it via the TI fusion tools successfully . And we could catch the wave of the I2C data and clock . 

But we don't know if there are stretches in the clock signal.

So I'm here to consult , should  my  I2c controller support   stretch  if I want to access the ucd9090a with my own code ?

Or are there any other ways I can access the ucd9090 using my code (FPGA/CPU) ?

that's it 

Thank you all the time.

best.