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USB
Regulator
USB
XCVR
USB
Controller
USB0_DP
USB0_DM
VDD
VOUT33
VREGIN
TYPE A
D+
D-
VBUS
Cstab
To PMC and Pads
Chip
Figure 3-15. USB regulator bus supply
3.9.1.3 USB power management
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.
3.9.1.4 VBUS detect
The USB FS controller does not include a dedicated VBUS detect pin. However, a GPIO
pin with interrupt capability can be used to detect the presence of VBUS in device mode.
If a GPIO pin with LLWU capability is used, VBUS can be detected in all low power
modes, including LLS and VLLS.
Software is responsible for detecting VBUS via a GPIO pin and configuring the USB
controller appropriately in response to the rising or falling edge of VBUS.
NOTE
An appropriately sized resistive voltage divider must be used if
the GPIO pin does not directly support a 5V input.
3.9.1.5 USB controller configuration
This section summarizes how the module has been configured in the chip. For a
comprehensive description of the module itself, see the module’s dedicated chapter.
Communication interfaces
K32 L2A Reference Manual, Rev. 2, 01/2020
84
NXP Semiconductors
Содержание K32 L2A Series
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Страница 122: ...Flash Memory Clock K32 L2A Reference Manual Rev 2 01 2020 122 NXP Semiconductors...
Страница 146: ...Module operation in low power modes K32 L2A Reference Manual Rev 2 01 2020 146 NXP Semiconductors...
Страница 158: ...Debug and security K32 L2A Reference Manual Rev 2 01 2020 158 NXP Semiconductors...
Страница 174: ...Module Signal Description Tables K32 L2A Reference Manual Rev 2 01 2020 174 NXP Semiconductors...
Страница 246: ...Application information K32 L2A Reference Manual Rev 2 01 2020 246 NXP Semiconductors...
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