maximum hbusout speed


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    Prolific Poster hadv215's Avatar
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    Default maximum hbusout speed

    When I read the manual I see there are two speeds, 100 kHz and 400 kHz.
    I have a MCP4725 DAC that supports both, but also 3.4 Mbps.
    Since I want to produce sine wave output of up to 10 kHz the standard speed (100/400) will be insufficient.

    Is the 3.4 Mbs speed possible using a 24HJ28GP502 and what do I have to do to make this possible?

    Regards, Harm

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    Senior Member tumbleweed's Avatar
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    Default Re: maximum hbusout speed

    Not as far as I know. I2C HS mode requires different drivers on the bus lines.
    There may be a PIC32 device or two that supports it, but most standard parts don't.

    I've had success increasing the speed by switching to active pullups instead of just using resistors. Search for I2C RTA rise time accelerators such as those from LinearTech/AnalogDevices and NXP.

    Using those I've been able to get close to 1M in some situations but it can be very chip/setup dependent.

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