Nordic 3 - Low-Power Accelerometer Circuit

6 Hardware description: Smart Remote 3 nRF52 product example
Doc. ID 4374_139 v1.1
Page 47
K1
*
K9
6
K21
TBD
K32
Menu
K40
UP
K17
K2
0
K10
1
K22
TBD
K33
Down
K41
TBD
K18
K3
#
K11
2
K23
V_Down
K34
Exit
K42
TV
K4
7
K12
3
K24
Mute
K35
Left
K43
SAT
K5
8
K13
Red
K25
C_Down
K36
OK
K44
DVD
K6
9
K14
Green
K26
V_Up
K37
Right
K45
AUX
K7
4
K15
Yellow
K27
Back
K38
TBD
K46
Power
K8
5
K16
Blue
K28
C_Up
K47
TBD
K19
K20
K29
K30
K31
K39
K
E
Y
O
U
T
_
0
K
E
Y
O
U
T
_
1
K
E
Y
O
U
T
_
2
K
E
Y
O
U
T
_
3
K
E
Y
O
U
T
_
4
K
E
Y
O
U
T
_
5
K
E
Y
O
U
T
_6
K
E
YO
U
T
_
7
KEYIN_0
KEYIN_1
KEYIN_2
KEYIN_3
KEYIN_4
Figure 34: Keypad matrix
6.3.3 Low-power accelerometer circuit
To obtain low power consumption and long battery lifetime, a low-power three-axis accelerometer (U7) has
been added to the remote control.
See Figure 35: Accelerometer circuit on page 48 for the schematic. See also Intelligent power saving on
page 24.