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When VDD_MCU is supplied from onboard 5.0 V LDO (J37 in position 1-2), a distinct power supply must be
connected to J35 Phoenix connector. This way, the MCU has a distinct power supply domain from FS23 device
under evaluation.
Figure 4
describes the MCU power supply selection:
12 V
GND
Figure 4. MCU power supply selection
Table 7. MCU power supply selection (J36/J37/J35)
Schematic label
J36-1-2
J36-2-3
J37-1-2
J37-2-3
J35-1
J35-2
4.4.6 MCU communication SPI/I
MCU communication with FS2300 can be configured to I
Table 8. MCU communication SPI/I
Schematic label
Signal name
J28-1-2
I2C_SDA
J28-2-3
SPI_CSB
J29-1-2
LVI5
J29-2-3
SPI_MOSI
J31-1-2
I2C_SCL
J31-2-3
SPI_SCK
J32-1-2
LVO6
J32-2-3
SPI_MISO
4.4.7 CAN and LIN connectors (J16/J20)
The CAN transceiver is supplied internally by V3 regulator.
The LIN bus driver is supplied by VSHS supply input.
UM11879
User manual
J35
1
5.0 V LDO
2
PHX
5.0 V USB
Signal name
P5V0
P3V3
P5V0_FROM_LDO
P5V0_FROM_USB
12V_PHX_IN
GND
2
C selection (J28/J29/J31/J32)
2
C selection (J28/J29/J31/J32)
Description
2
I
C is selected as MCU communication protocol.
SPI is selected as MCU communication protocol.
LVI5 is available when I
SPI is selected as MCU communication protocol.
2
I
C is selected as MCU communication protocol.
SPI is selected as MCU communication protocol.
LVO6 is available when I
SPI is selected as MCU communication protocol.
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 25 September 2023
3.3 V LDO
1
2
3
J37
Description
VDD_MCU is connected to 5.0 V (default).
VDD_MCU is connected to 3.3 V.
5.0 V power supply for VDD_MCU from LDO.
5.0 V power supply for VDD_MCU from USB.
12.0 V input for 5.0 V LDO supply via Phoenix connector.
Ground.
2
C (default) or SPI.
2
C is selected as MCU communication protocol.
2
C is selected as MCU communication protocol.
UM11879
KITFS23LDOEVM evaluation board
SW16
Reset
S32K144
3
MCU
2
1
J36
D21
ON when
MCU is
supplied
aaa-049443
© 2023 NXP B.V. All rights reserved.
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