PCF2131 datasheet(34/34 Pages) NXP

34 / 34 page

NXP Semiconductors

UM12262

FRDM-IMX91 Board User Manual

Contents

FRDM-IMX91 overview .................................... 2

1.1

Block diagram ....................................................2

1.2

Board features ................................................... 2

1.3

Board kit contents ..............................................3

1.4

Board pictures ................................................... 4

1.5

Connectors .........................................................7

1.6

Push buttons ......................................................8

1.7

DIP switch ..........................................................8

1.8

LEDs .................................................................. 9

FRDM-IMX91 functional description .............. 9

2.1

Processor .........................................................10

2.2

Power supply ................................................... 10

2.3

Clocks .............................................................. 13

2.4

I2C interface .................................................... 14

2.5

Boot mode and boot device configuration ........15

2.6

PDM interface ..................................................16

2.7

LPDDR4 DRAM memory .................................16

2.8

SD card interface .............................................17

2.9

eMMC memory ................................................ 17

2.10

M.2 interface ....................................................17

2.11

Tri-radio module interface ................................19

2.12

CAN interface .................................................. 21

2.13

USB interface .................................................. 22

2.14

Ethernet ........................................................... 22

2.15

EXPI connector ................................................23

2.16

Debug interface ............................................... 23

2.16.1

SWD interface ................................................. 23

2.16.2

USB debug interface ....................................... 24

2.17

Board errata .....................................................24

Working with accessories .............................24

3.1

5-inch Tianma LCD ..........................................24

3.1.1

Connection between Tianma panel and

adapter board .................................................. 25

3.1.2

Connection between adapter board and

FRDM-IMX91 ...................................................25

3.1.3

Software configuration update .........................26

3.2

Other accessory boards .................................. 26

3.2.1

Software configuration update .........................27

PCB information ............................................ 27

European Union regulatory compliance ......28

Acronyms ....................................................... 28

Related documentation ................................. 29

Note about the source code in the

document ........................................................31

Revision history .............................................31

Legal information ...........................................32

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section 'Legal information'.

For more information, please visit: https://www.nxp.com

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Date of release: 22 April 2025

Document identifier: UM12262

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