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What does each pin letter of this chip stand for and what does it mean?
Usually connected to power ground. & lt/ Li>

< Li & gtIN: Input signal pin, usually connected to the input signal source. & lt/ Li>

< lee > out: output signal pin, usually connected to the output signal load. & lt/ Li>

& lt Li & gtEN: Enable pin, which is usually used to control the start and stop of the chip. & lt/ Li>

< Lee > CLK: Clock pin, which is usually used to synchronize the internal operation of the chip. & lt/ Li>

< Li > rst: reset pin, which is usually used to restore the chip to the initial state. & lt/ Li>

& lt Li & gtNC: The pins are not connected, and generally no electronic components are connected. & lt/ Li>

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Above & ltp> are just some common chip pin marks and their meanings. The specific chip pin marks and meanings need to be confirmed according to the chip manual. & lt/p & gt;