CLKOUT/ZCR1CLKIN/XTAL22XTAL13LED14LED25INT16EN7VIP18VIN19IIP110IIN111VREF112GND_REF13GNDA14VDDA15GND_REG16VCC17GNDD18VDDD19SYN20SCS21SCL22MOSI/RXD23MISO/TXD24PAD25