Nordic 3 - Motion Tracking Device

5 Hardware description: Smart Remote 3 DK add-on
Doc. ID 4374_139 v1.1
Page 34
V
D
D
1
4
ADC3
13
GND
12
C
S
8
S
D
O
/
S
A
0
7
INT1
11
RES
10
INT2
9
VDD_IO
1
S
DA
/
S
D
I
/
S
D
O
6
GND
5
SCL/SPC
4
NC
2
NC
3
A
DC2
1
5
A
D
C
1
1
6
U3
LIS3DH
C29
10
µ
F
C28
100nF
C33
100nF
LIS3DH_INT1
I2C address: 0x18
VIO
VIO
VIO
I2C_CLK_2
I2C_DATA_2
SB25
SB19
I2C_DATA
I2C_CLK
SB24
SB26
R20
10k
R21
10k
VIO
VIO
Figure 20: Accelerometer circuit
The accelerometer has I
2
C outputs and can detect motion on three axes. The sensitivity is configurable to ±2
g/±4 g/±8 g/±16 g.
5.3.4 Motion tracking device
For advanced features, the remote control has a three-axis gyro integrated with a three-axis accelerometer
(U2).
C30
100nF
C31
2.2
µ
F
C32
10nF
VCC
I2C_DATA
I2C_CLK
I2C address: 0x68
C34
470nF
R19
N.C.
SB17
VIO
SB18
VU2
VU2
I2C_CLK_2
I2C_DATA_2
SB22
SB23
SB20
SB21
VDDIO
1
SCL//SPC
2
SDA/SDI
3
SA0/SDO
4
CS
5
INT
6
FSYNC
8
GND
13
REGOUT
14
VDD
16
RESV
7
RESV
9
RESV
10
RESV
11
RESV
12
RESV
15
U2
ICM-20608
ICM-20608_INT
Figure 21: Gyro/accelerometer circuit
The circuit is connected to the MCU by the first I
2
C. If you want to use the second I
2
C there are four solder
bridges that you need to change:
• Solder SB22 and SB23