NXP Semiconductors
UM12036
MCX-N9XX-EVK Board User Manual
Part identifier Part name and Manufacturer Description
J8 Würth Elektronik 7499211121A Shielded RJ45 connector jack with magnetic built-in to connect to
an Ethernet cable
U37 Microchip Technology LAN8741 Single-chip 10 /100 Mbit/s RMII Ethernet PHY is compliant with
IEEE802.3/802.3u (Fast Ethernet), ISO 802-3/IEEE 802.3 (10
BASE-T), and Energy-Efficient Ethernet IEEE 802.3az
Table 17. Ethernet interface devices
Input to the XTAL1/CLKIN pin of the Ethernet PHY can be either of the following:
• ENET0_TXCLK clock from the target MCU (MCX N94X) received through the P1_4 port. This is the default
configuration.
• OSC_50M clock from an external 50 MHz crystal oscillator (Y7). This oscillator can be enabled/disabled
through the JP50 jumper. The jumper is disabled by default to allow the target MCU to provide the PHY
clock (and should always be disabled when the target MCU has to provide the PHY clock). For details, see
Section 1.6.
The Ethernet circuit supports both 3.3 V and 1.8 V I/O operation. However, the jumper JP4 is provided to allow
for complete depowering of the Ethernet circuit. This may be necessary when connecting large loads to the
P3V3 net. For the JP4 jumper details, see Section 1.6.
2.7 Accelerometer sensor interface
On the MCX-N9XX-EVK board, an accelerometer sensor is used to sense motion, a feature required in the IoT
application space.
The main features of the Accelerometer sensor interface are as follows.
• 3-Axis Low-G MEMS accelerometer sensor device FXLS8964AF (U40) is used.
• The sensor device is powered by the VDD_FXL supply, which is tied to the VDD_P4 supply through a zero
ohm resistor (R893).
• Discrete pull-up resistors for the I2C bus lines are provided
• The default I2C address for the device is configured as 0x19. Address can be changed by pull-up / pull-down
resistors on the SA0 line.
– With a pull-up resistor (R299), a high signal on SA0, and the 7-bit I2C address is 0x19.
– With a pull-down resistor (R896), a low signal on SA0, and the 7-bit I2C address is 0x18.
• Two interrupt signals routed to test pads for prototyping, if required.
• The I2C uses shared lines for the I2C interface.
• Series zero ohm resistors (R42 and R43) are provided to isolate the sensor from the MCX N94X device.
Figure 20 shows the FXLS8964AF sensor 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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