NXP Semiconductors

UM12262

FRDM-IMX91 Board User Manual

Part

identifier

designator

Manufacturing

part number

Part

manufacturer

Power supply

Specifications Description

U703

FDS4435 (Power

Trench MOSFET)

SG MICRO

CORP

VDD_5V

5 V / 2.5 A

Supplies to:

• 10-pin dual-row header (P12)

• CAN transceiver through CAN_

VDD_5V

• RGB LED

Power source for:

• VPCIe_3V3

• VRPi_5V

• VBUS_USB2_5V

U732

SGM2525 (Load

switch)

SG MICRO

CORP

VRPi_3V3

3.3 V at 2.5 A

• 2x20-pin EXPI connector (P11)

U733

SGM2525 (Load

switch)

SG MICRO

CORP

VRPi_5V

5 V at 2.5 A

• 2x20-pin EXPI connector (P11)

U737

TLV76033DBZR

(Voltage regulator)

Texas

Instruments

VCC_3V3_

DEBUG

3.3 V

Supplies to 4-bit voltage-level

translator used for USB-to-dual

UART debug interface

U742

SGM2526 (Load

switch)

SG MICRO

CORP

VBUS_USB2_5

V

5 V / 2.5 A

Supplies to USB2.0 Type-A Host

Table 8. FRDM-IMX91 power supply devices...continued

[1]

BUCK1 and BUCK3 are configured as dual phase mode.

[2]

PCA9451 BUCK1/3 dual phase default output voltage is 0.85 V.

For further details on the power sequence needed by the i.MX 91, see section "Power sequence" in the i.MX 91

Reference Manual.

2.3 Clocks

FRDM-IMX91 provides all the clocks required for the processor and peripheral interfaces. Table 9 summarizes

the specifications of each clock and the component that provides it.

Part identifier Clock generator

Clock

Specifications

Destination

Y401

Crystal oscillator

XTALI_24M

XTALO_24M

Frequency: 24 MHz

Target processor

QZ401

Crystal oscillator

XTALI_32K

XTALO_32K

Frequency: 32.768 kHz NVCC_BBSM block of target

processor

QZ701

Crystal oscillator

XIN_32K

XOUT_32K

Frequency: 32.768 kHz PCA9451AHNY PMIC

Y402

Crystal oscillator

PHY1_XTAL_I

PHY1_XTAL_O

Frequency: 25 MHz

Ethernet RMII PHY1

Y403

Crystal oscillator

PHY2_XTAL_I

PHY2_XTAL_O

Frequency: 25 MHz

Ethernet RMII PHY2

Table 9. FRDM-IMX91 clocks

UM12262

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User manual

Rev. 3.0 — 22 April 2025

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