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What is this—a logic board for ants? Not quite, but weighing in at a whopping 1.0 gram it's definitely the smallest we've ever seen. With the hard work out of the way, we pause to see what makes the Pencil so smart:

ST Microelectronics STML151UCY6 Ultra-low-power 32-bit RISC ARM-based Cortex-M3 MCU

ST Microelectronics AS5C Y533 (also found in the 2015 Apple TV)

L05286 QS4 VG Z SGP 528

EWX 01129

Cambridge Silicon Radio (Qualcomm) CSR1012A05 Bluetooth Smart IC

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