NXP Semiconductors MCX-N9 EVK Series - USB interface

NXP Semiconductors
UM12036
MCX-N9XX-EVK Board User Manual
Clock
generator
Clock
frequency
Destination Description
• Port 5 pin 0 (EXTAL32K) of target
MCU MCX N94X
• Internal load capacitors provide the entire
crystal load capacitance.
• To measure the 32.768 kHz oscillator
frequency, enable the RTC_CLKOUT signal
to be available on the TAMPER1 pin. It can
be observed at J2_5.
Crystal
oscillator, Y3
24 MHz • Port 1 pin 30 (XTAL48M) of target
MCU MCX N94X
• Port 1 pin 31 (EXTAL48M) of target
MCU MCX N94X
For high-frequency accurate timebase:
• Required external load capacitors are
provided.
• Small package size (2.0 mm x 1.6 mm)
• Low-ESR (80 Ω) crystal.
Crystal
oscillator, Y5
32.7680 kHz Pin 50 (SUSCLK) of the M.2 Key E
card connector (J12)
Crystal oscillator VDD is supplied by the P3V3
power rail.
Crystal
oscillator, Y7
50 MHz RMII 10/100 Mbit/s Ethernet transceiver
(U37)
Provides ETHPHY_CLK to LAN8741 Ethernet
PHY depending upon the JP50 jumper setting.
It also provides a provision to feed the clock
back into the target MCU (MCX N94X). For
JP50 details, see Section 1.6.
Table 13. MCX-N9XX-EVK clocks...continued
2.3 USB interface
The target MCU (MCX N94X) features two USB modules (FS USB and HS USB), each with device and host
capabilities and a built-in transceiver.
• FS USB is a dual-role USB controller that supports full-speed (FS) device or FS / low-speed (LS) embedded
host operation
• HS USB can operate in either device or host mode. In device mode, it can connect to the USB host systems
at either HS USB rate of 480 Mbit/s or FS rate of 12 Mbit/s. In host mode, it can connect to peripheral devices
operating at HS, FS, or the USB 2.0 LS rate of 1.5 Mbit/s.
Table 14 describes the USB ports available on the MCX-N9XX-EVK board.
Part identifier Connector type Description
J28 USB2.0 Micro-AB
connector
Connects to FS USB controller of the target MCU. The J28 USB port
can connect in both Host and Device mode. In Device mode, this port
can provide the 5 V power supply source to the board depending upon
the J26 jumper setting (see Section 1.6).
J27 USB2.0 Micro-AB
connector
Connects to HS USB controller of the target MCU. The J27 USB port
can connect in both Host and Device mode. In Device mode, this port
can provide the 5 V power supply source to the board depending upon
the J26 jumper setting (see Section 1.6).
Table 14. USB Ports
FS USB interface
On the MCX-N9XX-EVK board, the USB0_DM and USB0_DP signals from the target MCU (MCX N94X)
connect to the onboard USB connector (J28) directly through the required 33 ohm resistors and a common
mode choke. The common mode choke is included for noise suppression on the DM / DP signals, however,
pads are included to install bypass resistors for testing choke-less configurations.
Figure 14 shows the FS USB circuit diagram.
UM12036 All information provided in this document is subject to legal disclaimers. © 2024 NXP B.V. All rights reserved.
User manual Rev. 1 — 20 January 2024
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