The module boot signal comes from either VDCIN_SENSE or VBUS_SENSE, because power applied to +VSYS alone does not enable module operation. If it is necessary for the module to be enabled whenever +VSYS is available or USB power supply is connected, connect the VDCIN_SENSE module signal to the +VSYS net expansion board, and connect +VBUS from the USB connector to the VBUS_SENSE signal

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