51.29 Universal Serial Bus (USB) Electrical Specifications

Table 51-41. USB Full-Speed/Low-Speed AC Electrical Specifications
AC CHARACTERISTICSStandard Operating Conditions: VDDIO 3.0V to 3.6V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial

Param. No.SymbolCharacteristics (1)Min.Typ.Max.UnitsConditions
USB_1VDDUSB (4)USB Transceiver Voltage33.6VVoltage on VDDIOx must be in this range for proper USB operation
Clocks
USB_23USBFSCLKS (2)USBFS Clock Source48MHzfGCLK_USBFS = 48 MHz
USB_24USBHSCLKS (3)USBHS Clock Source12 or 24MHz
USB_25USBFSAHBMin. AHB Clock for USBFS Operations12MHz
USB_26USBHSAHBMin. AHB Clock for USBHS Operations60MHz
Note:
  1. USBFS: Supports Full and Low-Speed communication. Compliant with USB 2.0 specification. USBHS: Supports High, Full and Low-Speed communication. Compliant with USB 2.0 specification.
  2. USBFS: Required clock accuracy: Full-Speed = ±0.25%, Low-Speed = ±1.5% .
  3. USBHS: XOSC clock source. Required clock accuracy: ±0.05% for all Speeds.
Table 51-42. USB Full-Speed/Low-Speed Clock Configuration
USBFS Clock configurationStandard Operating Conditions: VDDIO 3.0V to 3.6V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Extended Temp

Param. No.SymbolCharacteristicsDevice mode operation.Host mode operation.
USB_30USBFS_GCLK_SRCDFLL48M Open loopNoNo
DFLL48M Close loop, Ref. internal OSC sourceNoNo
DFLL48M Close loop, Ref. external XOSC / XOSC32K sourceYesNo
DFLL48M Close loop, Ref. SOF (USB recovery mode)YesN/A
PLL internal OSC (DFLL48M)NoNo
PLL external XOSCYesYes
XOSC CrystalYesYes