8-Kanal Pegelwandler basierend auf dem Texas Instruments TXB0108.
Because the Arduino (and Basic Stamp) are 5V devices, and most modern
sensors, displays, flash cards and modes are 3.3V-only, many makers find
that they need to perform level shifting/conversion to protect the 3.3V device from
Although one can use resistors to make a divider, for high speed
transfers, the resistors can add a lot of slew and cause havoc that is
tough to debug. For that reason, we like using 4050/74LVX245 series and
similar logic to perform proper level shifting. Only problem is that
they are only good in one direction which can be a problem for some
specialty bi-diectional interfaces and also makes wiring a little hairy.
That's where this lovely chip, the TXB0108 bi-directional level converter comes in! This chip
perform bidirectional level shifting from pretty much any voltage to any
voltage and will auto-detect the direction. Only thing that
doesn't work well with this chip
is i2c (because it uses strong pullups which confuse auto-direction
sensor). If you need to use pullups, you can but they should be at least
50K ohm - the ones internal to AVRs/Arduino are about 100K ohm so those
are OK! Its a little
more luxurious than a 74LVX245 but if you just don't want to worry about
directional pins this is a life saver!
This breakout saves you from having to solder the very fine
pitch packages that this chip comes with. We also add 0.1uF caps onto
both sides and a 10K pull-up resistor on the output enable pin so you
can use it right out of the box!