Hello,
I made a design using the TXB0102. Originally, I made the design to use it for a RS232 interface, with voltage level translation (From 3.3V to 5V).
After the card was finished, the requirement changed, and the RS232 is not needed any more.
Instead, I need to drive 2 LEDs.
I've problems to use it as a regular buffer, to drive a LED. If I use a serial resistor, it is affecting the current, and the led doesn't reach a good bright level.
Since the TXB0102 includes a serial 4K resistor, I thought is is possible to use this resistor as current limiter. The problem is, that when I connect a LED directly to the B side, when the driver goes low, the output voltage get stack at 2V (the direct voltage of the LED).
Please look at the attached schematic. The A side is connected to a processor, with a serial resistor of 22 Ohm.
Can you tell me if it is possible to use this device to drive a LED? Is it possible to find a solution with the current layout ?
Is there any other device, pin compatible, that can do the job ?
Thank you very much,
Leonardo.