NXP Semiconductors MC56F80000-EVKUM, User Manual, Page: 14 / 26

NXP Semiconductors
MC56F80000-EVKUM
MC56F80000-EVK Board User Manual
2.3 3-axis digital sensor
The MC56F80000-EVK board supports motion sensing using NXP FXLS8974CFR3
accelerometer. FXLS8974CFR3 is a compact 3-axis MEMS accelerometer designed for
use in applications that require ultra-low-power wake-up on motion.
FXLS8974CFR3 is connected to MC56F80748 through I2C interface, LPI2C. The
INTF_SEL pin of FXLS8974CFR3 has been connected to GND, so that I2C interface
mode is selected for this device.
The SA0 pin of the FXLS8974CFR3 device selects the least significant bit of its I2C
secondary address (device address). SA0 is set to 0 by default, remove R101 to set SA0
to 1.
•
When SA0 = 0, the I2C address (7-bit format) of the FXLS8974CFR3 device is set to
18h (default)
• When SA0 = 1, the I2C address (7-bit format) of the FXLS8974CFR3 device is set to
19h
Since the BT_MODE pin of the device is connected to GND, default operation mode is
enabled. For more information, refer to FXLS8974CF data sheet.
The following figure shows the accelerometer circuit diagram.
VDD
VDD VDD
VDD
C66
0.1 µF
R101 0
R160 0
R100 0
DNP
R152 0
C65
4.7 µF
R92 0
FXLS 8974CFR3
U18
BT_MODE
2
SCL/SCLK
5
INTF_SEL
9
SPI_CS/WAKE_UP
7
SA0/SPI_MISO
3
SDA/SPI_MOSI/SPI_DATA
4
INT1/MOT_DET
8
INT2/EXT_TRIG/BOOT_OUT
6
V
D
D
1
G
N
D
1
0
R98
10K
C67
0.1 µF
R159 0
DNP
R93 0
R87
10K
DNP R85
4.7K
R86
10K
DNP
R89 0
R84
4.7K
GF3
GF8
GF2
GF6
GC13
INT1_COMBO
INT2_COMBO
WAKE_UP
LP_SCL0 LP_SDA0
Figure 8. Accelerometer circuit diagram
FXLS8974CFR3 pin/signal MC56F80748 pin Description
SCL/SCLK GPIOF3 (LP_SCL0) I2C serial clock
SDA GPIOF2 (LP_SDA0) I2C serial data
INT1/MOT_DET GPIOF6 (INT1_COMBO) Mode-dependent multifunction I/O pin 1. For more detail,
refer to
FXLS8974CF data sheet
.
INT2/EXT_TRIG/BOOT_OUT GPIOC13 (INT2_COMBO)
(disconnected from GPIOC13
by default)
Mode-dependent multifunction I/O pin 2. For more detail,
refer to FXLS8974CF data sheet .
Table 12. FXLS8974CFR3 pin connections
MC56F80000-EVKUM All information provided in this document is subject to legal disclaimers. © 2022 NXP B.V. All rights reserved.
User manual Rev. 1 — 14 December 2022
14 / 26