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PIN Description: VCC: power supply positive pin -V: negative supply -IN: the inverting input of the internal op amp and the negative of the internal photodiode, Do not connect or apply feedback that is abandoned in the operation 1M: Internal 1M feedback resistor input OUT: Amplifier output COM: Internal photodiode positive, generally connected to GND Note: The module does not solder the CEXT external capacitor and the REXT external resistor, leaving the pad for easy extension.