NXP Semiconductors KW45B41Z-EVK - Accelerometer

NXP Semiconductors
KW45B41Z-EVKUM
KW45B41Z-EVK Board User Manual
KW45B41Z
2.4 GHz radio
Printed
inverted-F
antenna
SMA
connector
J7
Alternative option
Default option
Figure 21. RF diagram
Figure 22 shows the KW45B41Z-EVK RF circuit diagram.
CAD Note:
50 ohm controlled
impedence line
VDD_PA_2G4 enable +10dBm RF output
i
RC0402JR-070RL
R2
GCM1555C1H150GA16D
C3/C4 AUTO PART
Antenna
04025A100JAT2A
C5 DNP
LQG15HZ15NJ02D
L2 AUTO PART
LQG15WH1N5B02D
L15 AUTO PART
RC0402JR-070RL
L3 (Resistor)
GCM1555C1H1R1BA16D
C1 AUTO PART
GCM1555C1H2R5BA16D
C2 AUTO PART
VDD_PA_2G4
GND GND
GND
GND
GND
GND
GND
GND
R2 0
C5
10PF
DNP
C4
15pF
DNP
C2
2.5pF
C9
1uF
C3
15pF
C1
1.1pF
ANT1
F_Antenna
J7
SLE-100010072-F01
1
2
43
5
L2
15nH
1
2
L15
1.5nH
1 2
C10
12pF
L3 0
RF_SMA
ANT
ANT_RF
RF_50
ANT_50
RF_ANT
Figure 22. RF circuit diagram
The above circuit diagram is explained below:
• A 50 Ω controlled impedance line is used to connect various components on the RF circuit
• A minimum network required to match the antenna pin of the target MCU is provided through capacitors C1
and C2 and inductor L15
• Another capacitor C5 (DNP) can be added to match the inverted-F antenna to the 50 Ω controlled impedance
line
• By default, the inverted-F antenna is enabled and the SMA connector is disabled. The inverted-F antenna can
be disabled and the SMA connector can be enabled by moving the 15 pF capacitor from C3 to C4 (DNP).
• To get RF output higher than +7 dBm, the target MCU pin VDD_RF (which is powered from the VDD_RF
supply) must be powered with at least 2.5 V (which is also the maximum voltage supported on the pin)
2.8 Accelerometer
The KW45B41Z-EVK board has a 3-axis, 12-bit, compact digital accelerometer U12 (NXP FXLS8964AF)
with ±2g / ±4g / ±8g / ±16g acceleration support and selectable I2C. It is designed to be used for applications
requiring ultra-low-power wake-up on motion. With AEC-Q100 qualification and an extended temperature
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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