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i'm sorry for asking a stupid question, but currently i'm making a simple mp3 player with yx5200-24ss chip. Please read the attached schematic below:

Schematic

Is it alright if i'm not using pin 15 and pin 16 (adkey1 and adkey2) as shown in the schematic above? For i plan on using mcu to control the ic. Will it working properly without a 22k resistor between vdd io and the addkeys pins?

By the way this ic used in DFPlayer Mini

thanks.

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1 Answer 1

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Is it alright if i'm not using pin 15 and pin 16 (adkey1 and adkey2) as shown in the schematic above? For i plan on using mcu to control the ic. Will it working properly without a 22k resistor between vdd io and the addkeys pins?

If you aren't going to implement any of the keys, then the value of the pull-up resistor isn't critical, but you still need something to keep the line high. If it's allowed to float, the chip may read errant key presses.

You might even be able to get away with connecting ADKEY1/2 directly to the 3.3V rail, but I'd be a little wary of doing that.

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