NXP Semiconductors

UM12262

FRDM-IMX91 Board User Manual

Pin number

M.2 mini card connector

pin

Connection details

55

PEWAKE0

PCIE_nWAKE input for I/O expander (PCAL6524HEAZ, P0_2, I2C address:

0x22) if R2868 is populated

Table 16. M.2 mini card connector (P8) pinout...continued

For further details about i.MX 91 interfaces, see i.MX 91 Applications Processor Reference Manual.

2.11 Tri-radio module interface

The FRDM-IMX91 board features a Tri-radio (Wi-Fi 6, Bluetooth Low Energy 5.4, and 802.15.4) module based

on the NXP IW612 that interfaces with the SD2, UART5, SAI1, and SPI3 controller of the target processor.

Part identifier

Manufacturing part number

Description

U731

MAYA-W476-00B (u-blox)

Host-based Wi-Fi 6, Bluetooth Low Energy 5.4, and 802.15.4

modules for IoT applications

Table 17. Tri-radio module

The two antenna pins (RF_ANT0 and RF_ANT1) of the module connects to U.FL connectors P9 and P10 (DNP

by default). The module is supplied with VPCIe_3V3, VEXT_1V8, and VDD_1V8.

The MAYA-W476-00B module and M.2 connector share several interface lines on the FRDM-IMX91 board.

Zero-ohm resistors enable signal selection between these components.

SD3 interface

The SD3 interface lines are shared between the MAYA-W476-00B module and the M.2 connector. Zero-ohm

resistors select either the MAYA-W476-00B module (default setting) or the M.2 connector.

UART5 interface

Similarly, the UART5 interface lines are shared between the MAYA-W476-00B module and the M.2 connector.

Zero-ohm resistors select either the MAYA-W476-00B module (default setting) or the M.2 connector.

SAI1 interface

The SAI1 interface lines are shared between the MAYA-W476-00B module and the M.2 connector. Zero-ohm

resistors select either the MAYA-W476-00B module (default setting) or the M.2 connector for 1.8 V translated

signals, generated using the 74AVC4T3144 bidirectional voltage translator (U728).

SPI3 interface

The SPI3 signals (CLK, MOSI, MISO, and CS0) are multiplexed with GPIO_IO[08, 09, 10, 11] signals,

respectively. These SPI3 signals are shared between the MAYA-W476-00B module and the M.2 connector.

Zero-ohm resistors select either the MAYA-W476-00B module (default setting) or the M.2 connector for 1.8 V

translated signals, generated using the 74AVC4T3144 bidirectional voltage translator (U729).

UM12262

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User manual

Rev. 3.0 — 22 April 2025

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