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TS5A22362: Inquiry Regarding TS5A22362 IC Characteristics and Alternatives

SHH
Mastermind 30636 points
Part Number: TS5A22362
Other Parts Discussed in Thread: TS5A22366, TMUX2889

Hi team,

The customer has a special application where they switch between audio signals and I2C signals on the audio jack, as shown in the diagram below.

But when switching to I2C (IC VDD is 3.3V，and the SEL Keep high 3.3V.), we find that the I2C rising is very slow (rising to about 2.4V before being pulled low, unable to reach 3.3V). There was a time when bypassing TS5A22362 allowed the waveform to fully reach 3.3V and become close to a square wave.

I want to ask, what characteristic of the IC causes this? Is there a way to solve it? Or are there other suggested ICs? A single power supply is needed, but there will be negative voltage input and output.
thanks for help!

BR,
Scott

  • 0
    Guru 256980 points

    The speed of I²C rising edges is limited by the low-pass RC filter formed by the pull-up resistors (in this case, two in parallel) and the total bus capacitance. The TS5A22362 has a specified capacitance of 370 pF, which is near the upper I²C limit of 400 pF. Increasing the total pull-up current to 3 mA might help.

    The TS5A22366 would have 176 pF; the new TMUX2889 would have 100 pF. (Both are DSBGA packages.)