NXP Semiconductors

UM12262

FRDM-IMX91 Board User Manual

1 FRDM-IMX91 overview

The FRDM i.MX 91 development board (FRDM-IMX91 board) is a low-cost platform designed to show the most

commonly used features of the i.MX 91 Applications Processor in a small and low-cost package. The FRDM-

IMX91 board is an entry-level development board, which helps developers to get familiar with the processor

before investing a large amount of resources in more specific designs.

This document includes system setup and configurations, and provides detailed information on the overall

design and usage of the FRDM board from a hardware system perspective.

1.1 Block diagram

Figure 1 shows the FRDM-IMX91 block diagram.

Arm Cortex-A55 (1.4 GHz)

i.MX 91

PMIC

NXP PCA9451

DRAM

LPDDR4 : 1 GB < x16 b >

x16

bits

eMMC 5.1

GB HS400

x8

SDHC

SWD

SD2

I2C/SPI/UART...

MicroSD

SD3.0

SWD

DEBUG

EXPI CN

UART/I2C/SPI..

# Audio HAT/RFID/PDM...

HDR

ADC: HDR CN

HDR

RJ45

SYS PWR

PWR

DRAM

SD1

# AVB, 1588, and IEEE 802.3az

CORTEX0-A55

Remote debug support

MQS

LINE OUT

SD3/SPI3/

UART5/SAI1

USB 2.0

USB TYPE-C

USB 2.0

USB TYPE-A

USB1

USB 2.0 DRP

USB 2.0 DRP

x2 ENET

CAN

NXP TJA1051T/3

RGMII

Gigabit NET

ADC

x12 bit

ADC

PWM

BUTTON

RGB-LED

GPIO

UART to USB

UART

PDM

MQS

CANFD

SAI3

I2C

I2S

MicroSD

USB2

RTC

HDR

8

YT8521SH-CA

SW

RESET

MAYA-W476-00B

Wi-Fi/BT/802.15.4

M.2 NGFF

KEY-E

Figure 1. FRDM-IMX91 block diagram

1.2 Board features

Table 1 lists the features of FRDM-IMX91.

UM12262

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© 2025 NXP B.V. All rights reserved.

User manual

Rev. 3.0 — 22 April 2025

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