Ttl optical isolator sparkfun driver#

Like I mentioned earlier, there are 9 TO 220 transistors, three with their own heatsinks, six more bonded to a common sink, 9 screw terminals for wiring the MOSFETs to their coil leads all crammed on a tiny business card sized computer development proto board. Two more permitted controlling 7 MOSFETS and one SSR with a tiny footprint of 1' x 2' x ¾' including 33 wires for all three boards. This allowed me to have two encoders on one chip. Control response went from 97% - 99.9% range to 74% - 99.9%, giving tremendous improvement.Īnother feature is the bidirectional function of all ports. This MOSFET controls large 12vdc coils for a hydraulic valve. In fact bandwidth of transmitted PWMs has almost tripled.

These have one more use for us, We originally tried to drive some high power MOSFETs with poor response, but after adding pull up resistors to the gates, and IO static with a pull down resistor set internally on the pin, we get very reliable control.

Ttl optical isolator sparkfun driver#

While these were built to translate the voltage levels of TTL data streams, I found additional applications, such as MOSFET driver to isolate the sensitive IO ports on our Beaglebone Blacks, bring raw encoder outputs down from 5 to 3v3, isolate a high voltage SSR from the IO’s and raise the input from 3v3 to 5v for more positive actuation. Try looking at this forum posted on the Arduino forums for alternatives. I doubt it will work efficiently so the best might be to get a beefier n-channel mosfet or a dedicated logic level converter that can handle the higher voltages above 5V. It might work for higher voltages based on this fact but I am not sure how well it would work at 12V and 24V. Looking at the datasheet, the absolute maximum rating for the drain-source voltage is 50V with 0.22A continuous drain current. We’ve tested this more for 5V logic on the high side. The PCA9306 that was designed to convert voltage levels with I2C is able to reach about “1.0 V to 3.6 V and on the high side from 1.8 V to 5.5V.” If anyone requires a logic level conversion of around 1.0V, try looking at a dedicated converter. I tried using it with 1V but the 5V logic side wouldn’t fully turn off. It won’t fully turn the MOSFET ON or OFF below that voltage level. This logic level won’t work for anything lower than 1.8V. – Tech Support Tips/Troubleshooting/Common Issues -– High voltage (5V for example) to the ‘HV’ pin, low voltage (3.3V for example) to ‘LV’, and ground from the system to the ‘GND’ pin.ĭimensions: 0.63 x 0.52' (16.05 x 13.33mm) The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using.

Each level converter has the capability of converting 4 pins on the high side to 4 pins on the low side with two inputs and two outputs provided for each side. What really separates this Logic level converter from our previous versions is that you can successfully set your high and low voltages and step up and down between them safely on the same channel. This level converter also works with 2.8V and 1.8V devices. The SparkFun bi-directional logic level converter is a small device that safely steps down 5V signals to 3.3V AND steps up 3.3V to 5V at the same time. Description: If you’ve ever tried to connect a 3.3V device to a 5V system, you know what a challenge it can be.