K60P100M100SF2RM Datasheet, PDF (143/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

USB controller
Chapter 3 Chip Configuration
USB voltage
regulator
FS/LS
transceiver
Device charger
detect
VREGIN
VOUT33 D+
D-
Figure 3-52. USB Subsystem Overview
3.9.2.1 USB Wakeup
When the USB detects that there is no activity on the USB bus for more than 3 ms, the
INT_STAT[SLEEP] bit is set. This bit can cause an interrupt and software decides the
appropriate action.
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.
3.9.2.2 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).
3.9.2.2.1 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.
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
143