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LM63: Questions of LM63

Jimmy Lai
Expert 6845 points
Part Number: LM63

Dear Team,

We use LM63CIMA on our WiFi AP product to control the fan, and we use the I2C interface to control the LM63CIMA.

 

But from the datasheet, LM63CIMA only supports SMBus, and there are some differences in timing spec between SMBus and I2C.

 

Is there any risk to control the LM63CIMA via I2C directly?

We have done the timing test and found the data hold time failed

I think it is failed because we are using I2C. 

The I2C doesn't define any minimum timing requirement but SMbus has the minimum requirement of 300ns. Please advise.

Many Thanks,

Jimmy

  • 0
    TI__Mastermind 43715 points

    Hi Jimmy,

    Are you seeing LM63 ACK its address? Are you able to read 0x41 from ID register 0xFF?

    My experience is that when min hold time fails, the device will not respond. I2C/SMBus are generally accepted to be compatible; over the years the standards have changed to make them more similar. The LM63 was released in 2003, and reflects the SMBus 2.0 specification that was contemporary at that time.

    thanks,

    ren