5.2 Curiosity Nano Touch Adapter Power Supply

The Curiosity Nano Touch Adapter is powered from the USB port on a connected Curiosity Nano microcontroller board. The USB voltage is used to supply the Xplained Pro extension header and the microcontroller on the Curiosity Nano microcontroller board. The power LED at the bottom edge of the board is lit whenever there is a voltage on the 3.3V line.

The external power can be supplied to the Curiosity Nano Touch Adapter to power the Curiosity Nano microcontroller board and the touch extension board through the VEXT header. The VOFF pin connected to the Curiosity Nano microcontroller board is pulled low by the Curiosity Nano Touch Adapter board using “SW1” switch. When VOFF is low, the power supply on the Curiosity Nano microcontroller board is disabled and the external power is supplied from the Curiosity Nano Touch Adapter board to the Curiosity Nano microcontroller and touch extension board.