NXP Semiconductors KW45B41Z-EVK - LPUART;LIN Interface

NXP Semiconductors
KW45B41Z-EVKUM
KW45B41Z-EVK Board User Manual
CAN module Voltage translators Transceiver Connector
Two voltage translators U5
and U8 (74LVCH1T45). U5
and U8 shift voltage levels of
signals between the target
MCU and CAN transceiver
from VBOARD to 5 V and
vice versa.
High-speed CAN transceiver
U7 (NXP TJA1057GT/3),
which is designed for high-
speed CAN applications
in the automotive industry,
providing the differential
transmit and receive
capabilities to a CAN
protocol controller. It
converts and sends analog
data from CAN bus lines to
the target MCU as digital
data, and converts and
sends digital data from the
target MCU to the CAN bus
lines as analog data.
1x4 pin CAN header J10. It allows external
CAN connection and has the following
pinout:
• 1: High-level CAN bus line connection
• 2: Low-level CAN bus line connection
• 3: Power connection (P12V)
• 4: Ground (GND)
CAN0
Arduino socket DL connector J1. It allows a
CAN connection between the target MCU
and plugged-in Arduino board.
Table 12. KW45B41Z-EVK CAN connections
Figure 15 shows the CAN circuit diagram involving J10, U7, U5, and U8.
CAN0_RX
CAN0_TX
P5V_CAN
VBOARD
P5V_CAN
P5V
VBOARD
CAN
P5V_CAN
P12V
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
PTC5
PTC4
U8
74LVCH1T45
VCCA
1
GND
2
A
3
B
4
DIR
5
VCCB
6
C64
0.1UF
R44
60.4
R43 0
C56
0.1UF
C58
0.1UF
C59
0.1UF
C65
0.1UF
C63
4700PF
U5
74LVCH1T45
VCCA
1
GND
2
A
3
B
4
DIR
5
VCCB
6
R45
60.4
C57
0.1UF
R46 0
R42
4.7K
J10
HDR 1X4 RA
1
2
3
4
TJA1057GT/3
U7
TXD
1
GND
2
VCC
3
RXD
4
VIO
5
CANL
6
CANH
7
S
8
CAN_LO
CAN_HI
CAN_TX
CAN_RX
CAN_DIR
Figure 15. CAN circuit diagram
The above circuit diagram is explained below:
• The CAN interface of the board is only functional if the board is powered up using the P12V supply, which can
be produced through J9, pin 3 of 10, or pin 2 of J11
• U7 is powered up using the P5V_CAN supply, which is produced by the regulator U6
• J10 provides pins to interface with a CAN bus
• Pin 3 of J10 can be used to power up other KW45B41Z-EVK boards
• Pin 3 of the J10 can also be used as an input to power up the KW45B41Z-EVK board
2.4 LPUART/LIN interface
The target MCU (KW45B41Z) has two Low-Power Universal Asynchronous Receiver/Transmitter (LPUART)
modules, LPUART0 and LPUART1, with local interconnect network (LIN) support. The KW45B41Z-EVK board
supports connections to both LPUART modules. Figure 16 shows the LPUART/LIN diagram of the KW45B41Z-
EVK board.
KW45B41Z-EVKUM All information provided in this document is subject to legal disclaimers. © 2023 NXP B.V. All rights reserved.
User manual Rev. 2 — 13 February 2023
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