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Original question:

BQ4050: how to choose SMBC SMBD resistor value?

BQ40Z50-R1: SMBC Slow Rise time SM Bus

Randy Carpenter
Prodigy 20 points
Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: EV2400

Slow Rise time on SMBC of SM bus.

Scope shots were taken with a 10x probe.  Device is also connected to EV2400 and the EV2400 is connected to a PC via USB.

What is causing this slow rise time on SMBC and not on SMBD?   

  • 0
    TI__Genius 11535 points

    Hi Randy,

    It looks like there could be multiple devices could be pulling down the clock line or one of the devices are clock stretching. I'm not familiar with Microchip's IC EEPROM so I don't know if it is a master or slave device and if it is trying to set the clock in addition to the EV2400. Also, since you are using I2C and SMBUS in the same design I recommend you verify that your system compatible for both protocols.

    Best,

    Jessica