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I / O擴展IC 可以輕鬆地將GPIO，鍵盤，LED控件和計時器等功能擴展到現有系統。
|Features||Up to 24 GPIO pins; on-chip RC oscillation||Up to 24 GPIO pins; on-chip RC oscillation|
|Power Suppy||1.62-3.6 V||1.62-3.6 V|
|Status||Mass Production||Mass Production|
I2C接口；最高8×12鍵矩陣PWM定時器通用I / O引腳（GPIO）
多達24個通用I / O引腳