52.29 Universal Serial Bus (USB) Electrical Specifications

Table 52-41. USB Full-Speed or Low-Speed AC Electrical Specifications
AC CHARACTERISTICS			Standard Operating Conditions: VDDIO 3.0V to 3.6V (unless otherwise stated) Operating temperature: -40°C ≤ TA ≤ +85°C for Industrial
Param. No.	Symbol	Characteristics ⁽¹⁾	Min.	Typ.	Max.	Units	Conditions
USB_1	VDDUSB⁽⁴⁾	USB Transceiver Voltage	3	—	3.6	V	Voltage on VDDIOx must be in this range for proper USB operation
Clocks
USB_23	USBFSCLKS⁽²⁾	USBFS Clock Source	—	48	—	MHz	fGCLK_USBFS = 48 MHz
USB_24	USBHSCLKS⁽³⁾	USBHS Clock Source	—	12 or 24	—	MHz	—
USB_25	USBFSAHB	Minimum AHB Clock for USBFS Operations	12	—	—	MHz	—
USB_26	USBHSAHB	Min. AHB Clock for USBHS Operations	60	—	—	MHz	—
Note: USBFS: Supports full-speed and low-speed communication. Compliant with USB 2.0 specification. USBHS: Supports high-speed, full-speed, and low-speed communication. Compliant with USB 2.0 specification. USBFS: Required clock accuracy: full-speed = ±0.25%, low-speed = ±1.5%. USBHS: XOSC clock source. Required clock accuracy: ±0.05% for all speeds. USBFS voltage range: when TA = 125 °C, the voltage range will be limited to 3.3V ±5%.

Table 52-42. USB Full-Speed or Low-Speed Clock Configuration
USBFS Clock configuration			Standard Operating Conditions: VDDIO 3.0V to 3.6V (unless otherwise stated) Operating temperature: -40°C ≤ TA ≤ +85°C for Extended Temp
Param. No.	Symbol	Characteristics	Device mode operation.	Host mode operation.
USB_30	USBFS_GCLK_SRC	DFLL48M Open loop	No	No
		DFLL48M Close loop, Ref. internal OSC source	No	No
		DFLL48M close loop, Ref. external XOSC/XOSC32K source	Yes	No
		DFLL48M close loop, Ref. SOF (USB recovery mode)	Yes	N/A
		PLL internal OSC (DFLL48M)	No	No
		PLL external XOSC	Yes	Yes
		XOSC Crystal	Yes	Yes