Nordic 3 - Power Supply

6 Hardware description: Smart Remote 3 nRF52 product example
Doc. ID 4374_139 v1.1
Page 49
VDDIO
1
SCL//SPC
2
SDA/SDI
3
SA0/SDO
4
CS
5
INT
6
FSYNC
8
GND
13
REGOUT
14
VDD
16
U6
ICM-20608
C38
100nF
C39
2.2
µ
F
C40
10nF
I2C_DATA
I2C address: 0x68
C41
470nF
R35
N.C.
SB3
VDD
SB4
VICM
I2C_CLK
ICM-20608_INT
I
2
C
_
C
L
K
_
2
I
2
C
_
D
A
T
A
_
2
SB8
SB7
SB5
SB6
VICM
VIO_GYRO
Figure 36: Motion tracking device
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. SB7 and SB8 have to be soldered and SB5 and SB6 have to be cut. This
circuit is a ±250°/sec/±500°/sec/±1000°/sec/±2000°/sec selectable 3-axis gyro and a ±2 g/±4 g/±8 g/±16 g
selectable three-axis accelerometer.
6.3.5 Power supply
The Smart Remote 3 product example is powered from two AA batteries.
The batteries can be alkaline (2 × 1.5 V) or rechargeable NiMH (2 × 1.2 V) batteries. The battery circuit has a
protection diode to avoid reverse current if the board is powered elsewhere. In parallel with the battery there
is a connector (P3) that can be used for supply during development. See Figure 37: Battery schematic on page
50.