Tool/software:
Hello,
We are going to use TCA9535 to drive 16 LEDs connected to its 16 IO pins. We are concerned about our battery power consumption, specially when any of the LED is off. Please answer the following individually.
1. As per the datasheet section 10.2.2.2 it is stated as "Because the LED acts as a diode, when the LED is off, the I/O VIN is about 1.2 V less than VCC" As per my understanding the LED will be ON if the IO is set as output with output level as LOW and my question is when the LED is OFF then it is suppose to be done by setting the specific IO pins as output with its level as High. In this case the LEDs diode should be in reverse biased but why in the datasheet it is stated that Icc increased as VIN becomes lower than VCC as at that time the IO must be set as output and not input? Please let me know if my assumption is wrong or I am missing anything to understand this recommendation from the datasheet?
2. Why can't we use the LED with anode connected to the IO and cathode via resistor to the GND? Is it due to the current limitation that the lOH max limit is 10mA whereas the IOL can be higher up to 25mA?
Thank and regards,
Muhammad Awais
