Usb Power Distribution - NXP Semiconductors MKL27Z128VFM4 Reference Manual

Table of Contents

Chip-specific USBFS information

Waking from a low power mode (except in LLS/VLLS mode where USB is not powered)

occurs through an asynchronous interrupt triggered by activity on the USB bus. Setting

the USBTRC0[USBRESMEN] bit enables this function.

33.1.3 USB Power Distribution

This chip includes an internal 5 V to 3.3 V USB regulator that powers the USB

transceiver or the MCU (depending on the application).

33.1.3.1 AA/AAA cells power supply

The chip can be powered by two AA/AAA cells. In this case, the MCU is powered

through VDD which is within the 1.8 to 3.0 V range. After USB cable insertion is

detected, the USB regulator is enabled to power the USB transceiver.

Figure 33-2. USB regulator AA cell usecase

KL27 Sub-Family Reference Manual , Rev. 5, 01/2016

To PMC and Pads

Freescale Semiconductor, Inc.