It looks like PCB was initially designed for A2636 but A2639B (pin-compatible successor) is used. This is all-in-one mouse SoC from Apexone with optical sensor (800/1200cpi), USB + PS/2, voltage regulators, internal oscillator. Detailed datasheet is available.
Date on the silkscreen: 2008.09.08, model: JY-62.
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