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Member #549909

Member Since: April 29, 2014

Country: United States

  • I'm using this for SPI with Arduino converting MOSI from 5V to 3.3V. I have a problem with slow response: when input goes from 0 to 5V it takes almost 1 us for the output to reach 2V, and so it is unusable at full SPI speed on the Arduino. With a clock divider of 32 it just about works, but the waves are all triangular.

    Is this to be expected?

    I've connected: LV to 3.3V, HV to 5V, RXI to Arduino output and RXO to oscilloscope, and all GND to ground of course. I've tried to connect RXO to the SPI slave chip as well, but it looks the same.

    Update: tried with 5V input on TXI and 3.3V output on TXO. This is much faster, usable with no clock divider.

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