currentgpio
I'm working on a project that uses a GPIO port extender, but I need the ability to sink more current on the GPIO pins.
There are 24 GPIO pins. Each pin can either be input or output. The pins need to sink 50mA individually and up to 200mA over all.
Is there a small package that can help with this? Or maybe there's a port extender that already does this that I don't know about?
Use an USB converter chip like the FT245R that has an 8-bit parallel output instead of an asynchronous serial output.
For your wide range inputs you could consider a solution that I have used a number of times. Bring your inputs in through a circuit like this:
As shown the input threshold for high/low is set at 2.5V by use of the TLV431. The input signal coming through the 2.2K series resistors are clamped to the 5V supply to keep them in safe input range of the AM26LV32. Outputs swing from rail to rail of 0 to 3.3V for input to the FPGA.
Best Answer
This might be what your looking for
MAX7313