NXP Semiconductors FRDM-MCXN947 User manual

UM12018
FRDM-MCXN947 Board User Manual
Rev. 1 — 20 January 2024 User manual
Document information
Information Content
Keywords FRDM-MCXN947, UM12018, MCXN947
Abstract The NXP FRDM-MCXN947 board is a low-cost design and evaluation board based on MCXN947
device. This document describes the hardware for the FRDM-MCXN947 board.

NXP Semiconductors UM12018
FRDM-MCXN947 Board User Manual
1 FRDM-MCXN947 overview
The NXP FRDM-MCXN947 board is a low-cost design and evaluation board based on the MCXN947 device.
The MCXN947 device integrates a dual Arm Cortex-M33 microcontroller and a neural processing unit (NPU)
into a single package. NXP supports the MCXN947 device with tools and software that include hardware
evaluation boards, software development IDE, example applications, and drivers.
The FRDM-MCXN947 board consists of one MCXN947 device with a 64 Mbit external serial flash (provided
by Winbond). The board also features P3T1755DP I3C temperature sensor, TJA1057GTK/3Z CAN PHY,
Ethernet PHY, SDHC circuit (card slot is DNP), RGB LED, touch pad, high-speed USB circuit, push buttons, and
MCU-Link debug probe circuit. The board is compatible with the Arduino shield modules, Pmod boards, and
mikroBUS. The board also supports a camera module and NXP lost-cost LCD module PAR-LCD-S035.
The onboard MCU-Link debug probe is based on the LPC55S69 MCU. Before using the MCU-Link functionality,
ensure that it is programmed with the required firmware. For details, see Section 3.5.
1.1 Block diagram
Figure 1 shows the FRDM-MCXN947 board block diagram.
Figure 1. FRDM-MCXN947 block diagram
1.2 Board features
Table 1 describes the features of the FRDM-MCXN947 board.
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Board feature Target MCU features used Description
MCXN947 MCU
(target MCU)
The MCXN947 MCU is based on dual high-performance
Arm Cortex-M33 cores running up to 150 MHz, with 2 MB of
Flash with configurable full ECC RAM, a DSP coprocessor
and an integrated proprietary neural processing unit (NPU).
For details, see the MCX Nx4x Reference Manual.
Power supply •P5V0 (5 V) input power supply using one of the following
power sources:
–High-speed USB2.0 Type-C connector
–5 V regulator populated at 3-pin jumper
–Arduino Shield compatible header
–MCU-Link USB2.0 Type-C connector
•One LDO for 3.3 V power supply
•Jumpers and resistors configuration for different power
supplies
Clock Crystal oscillators for:
•24 MHz system reference clock
•32.768 kHz real-time clock (RTC)
•50 MHz Ethernet PHY clock input
•16 MHz clock input for MCU-Link
USB High-speed (HS) USB module One USB Type-C connector interfaced with high-speed USB
controller and PHY module
Flash memory FlexSPI controller Supports either of the following two options:
•Winbond W25Q64JVSSIQ - 64 Mbit QSPI flash memory
(populated)
•Micron MT35XL512ABA1G12 - 512 Mbit Octal flash
memory (DNP)
Temperature sensor Improved inter-integrated circuit (I3C) Supports NXP P3T1755DP temperature sensor
Ethernet Ethernet controller (ENET0) 10 / 100 Mbit/s (RMII) LAN8741 Ethernet PHY and RJ45
connector
I/O headers Headers compatible with:
•Arduino shields (outer rows) and FRDM header (inner
rows)
•Mikroe click boards
•Camera module
•LCD module
•Peripheral module (Pmod)
CAN FlexCAN controller One TJA1057GTK/3Z CAN PHY and one 4-pin CAN FD
connector
Mass storage µSDHC MicroSD card connector (DNP by default)
Touch pad Touch sensing input (TSI) One Touch Slider for touch sensing detection; connects to
the TSI input channel through the P1_3 pin
Debug •Onboard MCU-Link debug probe with CMSIS-DAP and
SEGGER J-Link protocol options. It can connect to the
target MCU through a USB-to-UART, USB-to-SPI, or USB-
to-I2C bridge.
•10-pin Arm JTAG/SWD connector for connecting an
external debug probe
Table 1. FRDM-MCXN947 features
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Board feature Target MCU features used Description
PCB 118 mm x 55 mm
Orderable part
number
FRDM-MCXN947
Table 1. FRDM-MCXN947 features...continued
1.3 Board kit contents
The FRDM-MCXN947 board kit contains the following items:
•FRDM-MCXN947 board hardware assembly
•A 3 ft micro USB Type A to USB Type C cable
1.4 Board pictures
Figure 2 shows the top view of FRDM-MCXN947.
Target MCU MCXN947
MCU-Link LPC55S69
Figure 2. FRDM-MCXN947 top view
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Figure 3 shows the top-side view of the FRDM-MCXN947 board, with connectors, push buttons, and LEDs
highlighted.
J17
MCU-Link5 USB
J16
MCX 10/100
Ethernet
connector
J11
MCX HS USB
J8
FlexIO / LCD
connector
J9
Camera connector
J7
PMOD connector
J1
Arduino
compatible
header (outer row) /
FRDM header (inner
row)
J2
Arduino
compatible
header (outer row) /
FRDM header (inner
row)
J4
Arduino
compatible
header (outer row) /
FRDM header (inner
row)
J3
Arduino
compatible
header (outer row) /
FRDM header (inner
row)
J5
mikroBUS header
J6
mikroBUS header
J23
MCX SWD
SW1
Reset
D1
MCX RST
LED
SW2
Wakeup
SW3
ISP
J10
CAN
header
D5 LED
D2
RGB LED
Figure 3. FRDM-MCXN947 connectors, push buttons, and LEDs (top-side view)
Figure 4 shows the jumpers on the FRDM-MCXN947 board.
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J18
J19
J15 (DNP)
J24
J26 J25 J27 J28
(DNP)
J22 J21
Figure 4. FRDM-MCXN947 jumpers
1.5 Connectors
Table 2 describes the FRDM-MCXN947 connectors. The connectors are shown in Figure 3.
Part
identifier
Connector type Description Reference section
J1 2 x 8 pin header
J2 2 x 10 pin header
J3 2 x 8 pin header
J4 2 x 6 pin header
Arduino compatible I/O header (outer rows) and
FRDM header (inner rows)
Section 2.9
J5 1 x 8 position receptacles mikroBUS socket connector Section 2.11
J6 1 x 8 position receptacles mikroBUS socket connector Section 2.11
J7 2 x 6 header (DNP) Pmod connector Section 2.13
J8 2 x 14 pin header FlexIO header for LCD screen connection Section 2.10
J9 2 x 16 pin header Used for connecting a camera Section 2.12
J10 2 x 2 pin header Connects to the CAN bus and allows external
connection with the bus
Section 2.5
J11 USB Type-C connector USB1 high-speed connector Section 2.3
J12 SDHC connector (DNP) To connect an external SD card Section 2.7
Table 2. FRDM-MCXN947 connectors
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Part
identifier
Connector type Description Reference section
J16 RJ45 connector Shielded RJ45 connector jack with magnetic
built-in
Section 2.4
J17 USB connector MCU-Link USB connector Section 3.7
J23 2 x 5 pin header Debug (JTAG / SWD) connector to connect an
external debug probe or external debug target
Section 3.8
Table 2. FRDM-MCXN947 connectors...continued
1.6 Jumpers
Table 3 describes the FRDM-MCXN947 jumpers. The jumpers are shown in Figure 4.
Part
identifier
Jumper type Description Reference section
J18 1x2 pin header •Open (default setting): MCU-Link VCOM port is enabled.
•Shorted: Sends a low signal on LPC_HW_VER_6 to
disable MCU-Link VCOM port
Section 3.8
J19 1x2 pin header •Open (default setting): Enables the MCU-Link SWD
feature
•Shorted: Sends a low signal on LPC_HW_VER_7 to
disable the onboard MCU-Link SWD feature
Note: This configuration is required to enable target MCU
debug through an external debug probe.
Section 3.3
J21 1x2 pin jumper MCU-Link (LPC55S69) force ISP mode jumper:
•Open (default setting): MCU-Link follows the normal
boot sequence (MCU-Link boots from internal flash if a
boot image is found). With the internal flash erased, the
MCU-Link normal boot sequence falls through to ISP boot
mode.
•Shorted: MCU-Link is forced to ISP mode (USB). Use this
setting to reprogram the MCU-Link internal flash with a
new image or use the MCUXpresso IDE with the CMSIS-
DAP protocol.
Note: By default, MCU-Link flash is preprogrammed with a
version of CMSIS-DAP firmware.
Section 3.5
J22 1x2 pin jumper MCU-Link SWD clock enable jumper:
•Open: MCU-Link SWD clock is disabled.
•Shorted (default setting): MCU-Link SWD clock is
enabled.
For more information
on this jumper, see
the FRDM-MCXN947
schematic
J24 1x2 pin header Pin 1-2 shorted (default setting): P3V3_MCU is sourced
from the P3V3 power supply
Section 2.1.1
J25 (DNP) 1x2 pin jumper DNP by default.
If shorted, VDD_IO_USB is powered by P3V3_MCU through
the jumper.
Note: BY default, VDD_IO_USB is powered from the P3
V3_MCU supply through a zero-ohm shunt resistor.
Section 2.1.1
J26 (DNP) 1x2 pin jumper DNP by default. Section 2.1.1
Table 3. FRDM-MCXN947 jumpers
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Part
identifier
Jumper type Description Reference section
If shorted, VDD_ANA is powered by P3V3_MCU through the
jumper.
Note: BY default, VDD_ANA is powered from the P3V3_
MCU supply through a zero-ohm shunt resistor.
J27 (DNP) 1x2 pin jumper DNP by default.
If shorted, VDD_BAT is powered by P3V3_MCU through the
jumper.
Note: BY default, VDD_BAT is powered from the P3V3_
MCU supply through a zero-ohm shunt resistor.
Section 2.1.1
J28 (DNP) 1x2 pin jumper DNP by default.
If shorted, VDD_CORE_SYS is powered by P3V3_MCU
through the jumper.
Note: BY default, VDD_CORE_SYS is powered from the
P3V3_MCU supply through a zero-ohm shunt resistor.
Section 2.1.1
Table 3. FRDM-MCXN947 jumpers...continued
1.7 Push buttons
Tactile buttons are populated on the FRDM-MCXN947 board for human machine interaction (HMI). Each of the
SW[1:3] buttons has a 0.1 µF bypass capacitor for debouncing and pads for external pull-up resistors.
Table 4 describes the FRDM-MCXN947 push buttons. The push buttons are shown in Figure 3.
Part identifier Switch name Description
SW1 Reset button (MCXN947 RST) Pressing SW1 resets the target MCU that causes board peripherals to
reset to their default states and execute the boot code. When SW1 is
pressed, the reset LED D1 turns ON.
SW2 Wakeup button SW2 is a general-purpose input and a low-power wake up unit (WUU)
pin. Pressing SW2 gives a low level on P0_23/WAKEUP_B, otherwise,
it is a high level on P0_23/WAKEUP_B.
SW3 In-system programming (ISP)
mode switch
SW3 is an ISP mode switch and can also act as a general-purpose
input. Pressing SW3 gives a low level on P0_6/ISPMODE_N-DEBUG,
otherwise, it is a high level on P0_6/ISPMODE_N-DEBUG.
Table 4. FRDM-MCXN947 push buttons
Figure 5 shows the circuit diagrams of the FRDM-MCXN947 push buttons.
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Figure 5. Push button circuit diagram
1.8 LEDs
Table 5 describes the FRDM-MCXN947 light-emitting diodes (LEDs) that correspond to the target MCU. The
board also has some MCU-Link-specific LEDs, which are described in Section 3.10. The LEDs are shown in
Figure 3.
Note: The FRDM-MCXN947 board also has three status indicator LEDs for MCU-Link. For details, see
Section 3.10.
Part
identifier
LED color LED name / function Description
D1 Red Reset LED Indicates system reset activity. When board reset is initiated,
for example, by pressing the SW1 reset button, the D1 LED
turns ON.
D2 Red/green/blue RGB LED User application LEDs. Each of these LEDs can be controlled
through a user application.
•Red LED connects to target MCU pin P0_10
•Green LED connects to target MCU pin P0_27
•Blue LED connects to target MCU pin P1_2
D5 Green P3V3 PWR ON Indicates P3V3 power on status. When P3V3 is available on
board, D5 turns ON.
Table 5. FRDM-MCXN947 LEDs
Figure 6 shows the circuit diagram of the RGB LEDs described in Table 5.
Figure 6. RGB LED circuit diagram
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2 FRDM-MCXN947 functional description
This section describes the features and functions of the FRDM-MCXN947 board. You can use the functionality
described in this section as a reference while designing your own target board.
Note: For more details on the MCXN947 MCU, see MCX N94x, N54x Product Family Data Sheet and MCX
Nx4x Reference Manual.
2.1 Power supplies
The FRDM-MCXN947 board is powered with a P5V0 (5 V) power supply using one of the following source
options:
•P5V_USB_HS supply from high-speed (HS) USB2.0 Type-C connector (J11)
•P5V_HDR_IN supply from 5 V regulator populated at 3-pin jumper (J15) (Not populated by default)
•P5V0 supply from Arduino Shield compatible header, J3 (pin 10)
•P5V_MCU_LINK_USB supply from MCU-Link USB2.0 Type-C connector (J17)
The P5V0 supply is an input power supply on the board and is a source for secondary power supplies.
Other power supplies in the FRDM-MCXN947 board are through voltage regulators or are connected through
jumpers, which can be used to enable/disable a power supply.
Section 2.1 shows the system power circuit on the FRDM-MCXN947 board.
Figure 7. FRDM-MCXN947 system power circuit diagram
5 V power sources and selection
Table 6 describes the 5 V input power sources and their output power supplies.
Part identifier Device / power source Output power supply Description
J17 MCU-Link USB2.0
Type-C connector
P5V_MCU_LINK_USB •One of the sources of P5V0 (5 V) supply
(default option)
•USB regulator input power supply for MCU-
Link microcontroller LPC55S69
J11 HS USB2.0 Type-C
connector
P5V_USB_HS One of the sources for P5V0 (5 V) supply
J15 5 V power regulator
populated at J15
P5V_HDR_IN One of the sources for P5V0 (5 V) supply
J3 (pin 10) Arduino shield
compatible header
P5V0 Power supply for:
•XC6227C331PR-G LDO voltage regulator
(U2)
•TJA1057 CAN PHY (U10) and CAN 2x2-pin
header (J10)
•mikroBUS connector (J5)
Table 6. 5 V power sources
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Part identifier Device / power source Output power supply Description
•HS USB connector power switch NX5P3090
UK (U3)
Table 6. 5 V power sources...continued
3.3 V power sources and selection
Table 7 describes the 3.3 V input power sources and their output power supplies.
Part identifier Device / power source Output power supply Description
U2 XC6227C331PR-G
(TOREX)
LDO_3V3 One of the sources for P3V3 supply (default
selection)
J3 (pin 8) Arduino shield
compatible header
P3V3 •Power supply for:
–PTN5150A USB Type-C CC logic
–P3T1755DP I3C sensor
–QSPI Flash memory (W25Q64JVSSIQ)
–SD card connector J12 (DNP)
–Crystal oscillator (Y3)
–CAN transceiver TJA1057 (U10)
–RGB LED (D2)
–mikroBUS connector (J6)
–Pmod connector (J7)
–Parallel camera connector (J9)
–FLEXIO / LCD connector (J8)
–MCU-Link LPC55S69 (U11)
•Power source for the P3V3_MCU supply
through the J24 jumper. For details, see
Section 1.6
•Power source for EPHY_VDDIO and EPHY_
VDDA supplies for Ethernet transceiver
LAN8741 (U9)
Table 7. P3V3 power sources
2.1.1 Power supply configuration
Once the main power configurations are set, the target MCU power configurations must be made. The MCU
power is configured by a network of jumpers or by a combination of resistors, capacitors, and diodes as shown
in Figure 8.
These jumpers provide access to insert ammeters in all the supplies connecting to the MCX N947 device. They
also provide a means of connecting external supplies to any of the MCX power pins.
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Figure 8. Power configuration
Table 8 describes the power supply configurations for MCU analog, USB and other operations.
Power source Zero-ohm resistor or Jumper
used
Power supply rail Description
•R151 resistor (installed)
•R212 resistor (installed)
•J25 jumper (DNP)
VDD_IO_USB •Power supply for the MCU power
pin VDD_USB
•Power source for VDD_P0/1,
VDD_P2, VDD_P3, and VDD_P4
power supplies
•R15 resistor (installed)
•J27 jumper (DNP)
VDD_BAT Power supply for VBAT domain and
Port 5
•R152 resistor (installed)
•J26 jumper (DNP)
VDD_ANA Power supply for:
•MCU analog power pin VDD_ANA
•Arduino header J2 pin 16
P3V3_MCU
•R16 resistor (installed)
•J28 jumper (DNP)
VDD_CORE_SYS Power source for:
•VDD_DCDC
•VDD_LDO_CORE_IN
•VDD_LDO_SYS_IN
Table 8. MCU power supplies
Table 9 describes the typical power supply configurations for DCDC and LDO operations.
Solder options for resistorsMode
R14 R18 R19 R17 R194 R20
•DCDC_CORE enable
•LDO_CORE disable
(Default setting)
Populate Populate Populate DNP DNP DNP
Table 9. Power supply configurations for DCDC and LDO operation
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Solder options for resistorsMode
R14 R18 R19 R17 R194 R20
•DCDC_CORE disable
•LDO_CORE enable
DNP DNP DNP Populate Populate Populate
Table 9. Power supply configurations for DCDC and LDO operation...continued
2.1.2 DC-DC inductor
The FRDM-MCXN947 board uses a 1.5 μH DC-DC inductor L2 (SHENZHEN SUNLORD SPH252012H1R5MT).
The inductor is enabled when the board is configured in DC-DC Buck mode. Figure 8 shows the DC-DC
inductor circuit diagram of the FRDM-MCXN947 board.
Choosing the right DC-DC inductor for your target board is important. When selecting a DC-DC inductor, refer to
the specifications mentioned in the MCX N94x, N54x Product Family Data Sheet.
2.2 Clocks
The FRDM-MCXN947 board provides crystal oscillators to provide accurate time bases for the device and
different components on the board.
Table 10 describes the clock sources available on the FRDM-MCXN947 board.
Clock
generator
Clock
frequency
Destination Description
Crystal
oscillator, Y1
(830108212309,
Wurth
Electronics)
24 MHz •Port 1 pin 30 (XTAL48M) of target
MCU MCXN947
•Port 1 pin 31 (EXTAL48M) of target
MCU MCXN947
For high-frequency accurate timebase
•Required external load capacitors are
provided
•Small package size (2.0 mm x 1.6 mm)
•Low-ESR (100 Ω max) crystal
Crystal
oscillator, Y2
(830009678,
Wurth
Electronics)
32.768 kHz •Port 5 pin 1 (XTAL32K) of target
MCU MCXN947
•Port 5 pin 0 (EXTAL32K) of target
MCU MCXN947
For accurate low-power timebase
•Internal load capacitors provide the entire
crystal load capacitance
•To measure the 32.768 kHz oscillator
frequency, enable the RTC_CLKOUT signal
to be available on the P5_3 pin. It can be
observed at pin5 of connector J2
Crystal
oscillator, Y3
(ECS-2333-
500-BN-TR)
50 MHz RMII 10/100 Mbit/s Ethernet transceiver
LAN8741A-EN (U9)
Provides clock at XTAL1/CLKIN pin of
Ethernet PHY depending upon the R154
resistor setting (DNP by default). Also, it
provides a provision to feed the clock back
into the target MCU (MCXN947) through Port
P1 pin 4 (P1_4/ENET_TXCLK)
Crystal
oscillator, Y4
(830064296,
Wurth
Electronics)
16 MHz XTAL32M_N/P pins of LPC55S69
MCU-Link
Option for external clock input
Table 10. FRDM-MCXN947 clocks
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2.3 USB interface
The target MCU (MCXN947) features two USB modules (FS USB and HS USB), each with device and host
capabilities and a built-in transceiver.
On the FRDM-MCXN947 board, only the HS USB controller and PHY interface is used and it is connected to
USB Type-C connector (J11).
Figure 9 shows the HS USB circuit diagram.
Figure 9. HS USB circuit diagram
Table 11 describes the devices used for connection between HS USB controller and USB Type-C connector.
Part identifier Connector type Description
J11 USB2.0 Type-C
connector
Port can connect in both Host and Device mode. In Device mode, this port
provides the 5 V power supply (P5V_USB_HS) source to the board.
U3 NX5P3090UK USB Power Delivery (PD) and type C current-limited power switch
U5 PTN5150A CC Logic chip supporting the USB Type-C connector application with
Configuration Channel (CC) control logic detection and indication functions
•ADR/CON_DET pin configuration:
–When pull up to P3V3_PTN with 10 kΩ resistor (R40), ADR (input) function:
ADR=1: I2C Address: 0x7A (ADR)
–When pull down to GND with 10 kΩ resistor (R49), ADR (input) function:
ADR=0: I2C Address: 0x3A (ADR)
–ARD=Mid/Floating (default setting), this pin automatically switches from
input to CON_DET output in non-I2C mode after TINPUTLATCH
–CON_DET (output) function:
– CON_DET=1: Connected detected
– CON_DET=0: No connection
•PORT pin configuration:
–When pull up to P3V3_PTN with 10 kΩ resistor (R42), PORT=1: DFP mode
–When pull down to GND with 10 kΩ resistor (R50), PORT=0: UFP mode
–When Floating (default setting): DRP mode
Table 11. USB Ports
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On the FRDM-MCXN947 board, the USB1_DM and USB1_DP signals from the target MCU connect to the
onboard USB connector (J11) directly through a common mode choke. The common mode choke is included for
noise suppression on the DM / DP signals.
2.4 Ethernet interface
The target MCU (MCXN947) features one Ethernet controller (ENET0) module.
On the FRDM-MCXN947 board, the Ethernet controller connects to an RJ45 connector through an Ethernet
PHY transceiver. The transmit, receive, and other Ethernet signals are on the P1 port pins. The FRDM-
MCXN947 only supports RMII configuration. For this reason, the TXD3 and TXD2 pins of the Ethernet PHY
(LAN8741A-EN) have been grounded through resistors R68 and R67, respectively.
Table 12 describes the onboard devices supporting the Ethernet interface.
Part identifier Part name and Manufacturer Description
J16 Heling MJ88B-B011-RVL11-P Shielded RJ45 connector jack with magnetic built-in to connect to
an Ethernet cable
U9 Microchip Technology LAN8741
A-EN
Single-chip 10 /100 Mbit/s RMII Ethernet PHY compliant with
IEEE802.3/802.3u (Fast Ethernet), ISO 802-3/IEEE 802.3 (10
BASE-T), and Energy-Efficient Ethernet IEEE 802.3az
T1 BOURNS PT61018PEL Dual-channel 16-pin Ethernet transformer for LAN 10/100 Base-Tx
Table 12. Ethernet interface devices
Input to the XTAL1/CLKIN pin of the Ethernet PHY is a 50 MHz clock from an external 50 MHz crystal oscillator
(Y3). The oscillator is enabled by default. The clock circuit also provides a provision to feed the clock back into
the target MCU (MCXN947) through Port P1 pin 4 (P1_4/ENET_TXCLK).
Note: The 50 MHz oscillator can be disabled by populating the R154 resistor.
2.5 FlexCAN interface
The controller area network (FlexCAN) is a full implementation of the CAN protocol specification, the CAN
with flexible data rate (CAN FD) protocol, and the CAN 2.0 version B protocol, which supports both standard
and extended message frames and long payloads. The target MCU (MCXN947) supports two CAN (w/wo FD)
controllers (CAN0 to CAN1).
On FRDM-MCXN947, only the CAN0 controller is used. The CAN0 controller connects to a 4-pin CAN header
through a CAN transceiver (TJA1057GTK/3Z). The CAN0_TXD and CAN0_RXD signals are through ports
P1_10 and P1_11, respectively.
Table 13 describes the HS CAN transceiver and 4-pin CAN header used on the board.
Part identifier Manufacturing part
number
Description
U10 TJA1057GTK/3Z High-speed CAN transceiver. It provides an interface between the CAN0
controller and the physical two-wire CAN0 bus.
J10 - 4-pin CAN header. It is connected to the CAN0 bus and allows external
connection with the bus.
Table 13. High-speed CAN transceiver and header
Figure 10 shows the FlexCAN interface schematic.
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Figure 10. FlexCAN interface schematic
Table 14 describes the 4-pin J10 CAN header pinout.
Pin Signal Description
1 CAN1_H CAN transceiver high signal
2 CAN1_L CAN transceiver low signal
3 P5V0 5 V power supply
4 GND Ground
Table 14. CAN header - pinout
2.6 I3C sensor interface
The FRDM-MCXN947 board includes one P3T1755DP digital temperature sensor to demonstrate the I3C
capabilities of the target MCU. This sensor device allows for 32 I3C provisional IDs, supports the full operating
voltage of the board, programmable overtemperature alerts, 12b resolution, and has an accuracy of ±0.5 °C
(maximum) from –20 °C to +85 °C.
The 7-bit I2C address of the sensor device is 0b1001000 (0x48).
Figure 11 shows the I3C sensor schematic diagram.
Figure 11. I3C sensor schematic diagram
The sensor device connect to the I3C1 controller of the device through P1_[16:17] Port. The data line is also
connected to the GPIO (P1_11/I3C1_PUR) for the I3C Pull-Up Resistance (PUR) provision through the 1 kΩ
R53 resistor.
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2.7 SD card interface
The target MCU (MCX N94X) features one micro secure digital host controller (uSDHC) module.
On the FRDM-MCXN947 board, the uSDHC controller connects to the SD card connector (J12) (not populated
by default).
•The SD card detect pin is an open switch that shorts with GND when the card is inserted.
•The SD card VDD (P3V3_SDHC) is supplied by the P3V3 rail through a zero-ohm resistor R202.
•All SD card bus pins connect to Port P2_[7:1] pins. Therefore, the Port P2 voltage must be set according to
the type of card being used.
Figure 12 shows the SD card connections.
Figure 12. Micro SD card connector circuit
The Port P2_[7:2] lines that are used for the SDHC card slot are also shared with the PWM signals on the
Arduino compatible headers (J1, J2, and J3). The Port P2_[2] line is shared with the camera connector and
PWM signals on the Arduino compatible headers (J2 and J3). The zero-ohm onboard resistor (R168) is used
to allow the selection of signals between the SDHC card slot or the camera connector. The Arduino-compatible
header sockets are connected by default.
Figure 13 shows the zero-ohm resistors connection for uSDHC signals selection.
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Figure 13. uSDHC card connection selection resistors
2.8 Flash memory interface
The target MCU (MCXN947) features one Flexible Serial Peripheral Interface (FlexSPI) controller, which can
support an external memory.
On the FRDM-MCXN47 board, the MCU MCXN947 FlexSPI controller can connect either to an onboard QSPI
flash memory (U8) or to an octal flash memory (U7). The footprint of U7 and U8 is overlapped, where U8 is
populated by default and U7 is DNP.
The flash memory VCC is supplied by the P3V3 rail.
Table 15 provides the details of the flash memory used on the board.
Part
identifier
Manufacturer and part name Description
U8 Winbond W25Q64JVSSIQ[1] It is a 3 V 64 Mbit (8 MB) serial flash memory with dual and quad SPI,
which is intended for demonstrating FlexSPI boot applications, and
general FlexSPI operation.
For main features, refer to device data sheet.
U7 Micron Technology MT35XL512
ABA1G12
512 Mbit, 2.7 V - 3.6 V, Octal I/O type, 64 MB T-PBGA NOR Flash
memory
Table 15. Flash memory
[1] The other option of QSPI Flash memory that can be used on the board is MT25QL128ABA1ESE-0SIT (MICRON).
Figure 14 shows the flash memory circuit diagram.
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Figure 14. Flash memory circuit diagram
The FlexSPI data and clock signals for the flash memory interface are available on Port P3_[1:0] and P3_[15:6]
pins.
2.9 Arduino compatible I/O headers
The FRDM-MCXN947 board provides Arduino Uno compatible headers to support the Arduino and FRDM
ecosystem shield modules. These headers are dual-row headers with the outer rows supporting the Arduino
compatible shields and the inner rows supporting the various FRDM shields. These headers are designed to
support the following shields:
•Sensor: FRDM-STBC-AGM01, FRDM-STBC-AGM04, FRDM-FXS-MULT2-B
•NFC: OM5577, OM5578
•USB Type C: OM13790 (Host)
•Motor control: FRDM-MC-LVBLDC, FRDM-MC-LVPMSM
•Touch: FRDM-TOUCH
Table 16 describes the connectors of the Arduino socket.
Part identifier Connector type
J1 2x8 position receptacle
J2 2x10 position receptacle
J3 2x8 position receptacle
J4 2x6 position receptacle
Table 16. Arduino socket connectors
Figure 15 shows the pinout of the Arduino socket connectors.
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Figure 15. Arduino socket connector pinout
To allow for the flexibility in the design, some of the signals on the I/O headers can be swapped for other
connections using zero-ohm resistors or jumpers. Table 16 describes such signals.
Pin
number
Device
pin / GPIO
Function / Signal name Resistor setting Potential conflict
P3_16 SAI1_TX_BCLK SJ11 Pin 1-2 selection
(Default setting)
-1
P4_5 SINC0_MBIT4-HDR SJ11 Pin 2-3 selection FlexIO LCD connector (J8) pin 6
Table 17. Arduino compatible header J1 pinout
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