Appendix A
Release Notes for Revision 4
A.1 About This Document chapter changes
• No substantial content changes
A.2 Introduction chapter changes
• Added three new CSP variants in orderable parts table
• Added 88 QFN package information in Orderable Parts table
A.3 Chip Configuration chapter changes
• Updated "Flash Memory Sizes" section and SRAM sizes section
• Added note to section "FlexBus"
• Added 88 QFN package in Flash memory sizes table and SRAM sizes table
• In "Universal Serial Bus (USB) FS Subsystem," section, updated the fourth bullet to "Status detection and wakeup
functions for USB data pins, VBUS pin, and OTG ID pin."
• Updated the figure, "USB FS/LS Subsystem Overview," adding block for IRC48M.
• Changed title of the section, "USB Wakeup," to "USB pin status detection and wakeup interrupt features"; updated
feature descriptions for clarification.
• In "USB Power Distribution," section, edited description for clarification as follows: This chip includes an internal 5 V to
3.3 V USB regulator that powers the USB transceiver and USB device charger detection module. The regulator output
may optionally be used to power the MCU VDD (depending on the application).
• In "USB power management" section, edited description for clarification as follows: "The regulator should be put into
STANDBY mode whenever the chip is in Stop mode and the USB bus is not in use. The regulator must remain in RUN
mode for all USB communication including Suspend, Resume, and Reset signaling."
• In "USB and VREGIN pin status detection and wakeup interrupt features" section, removed "and VREGIN" from title
• In "USB Power Distribution" section, removed note about pin names
• Removed VBUS Detect section
• In USB controller configuration section, updated the recommendation for unconnected USB pins; the note is now
NOTE:
When USB is not used in the application, it is recommended that the USB regulator VREGIN and
VOUT33 pins are tied to ground through 10kΩ; leaving these pin(s) floating is not recommended.
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 1395
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