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SAMA5D3x-EK User Guide [USER GUIDE]
11180B–ATARM–29-Oct-13
6.1.4
Backlight
The backlight voltage is generated from a CP2122ST/CP2123ST boost converter. It is powered directly by the 5V DC
from the EK board. The backlight level is controlled by a PWM signal generated from the SAMA5D3 series processor.
Figure 6-4.
DM Back Light Control
6.1.5
QTouch
The 5-0_WVGA_R_AEA-DM board carries a QTouch device driven through a TWI interface. It manages four capacitive
touch buttons directly printed on the PCB.
There is dual footprint for the QTouch device. SOIC is the default mounted one.
Figure 6-5.
DM QTouch
6.1.6
1-Wire
The 5-0_WVGA_R_AEA-DM board also uses a 1-wire device as a “soft label” to store the information such as chip type,
manufacture name, production date, etc.
Figure 6-6.
DM 1-Wire
2*20mA, 24.5V
2 x 7 LEDs Back Light
300mV
50V
A
m
0
4
/
V
5
.
4
2
A
m
7
1
2
/
V
5
60V/1A
880mA
10V
VLED-
VLED+
LCDPWM
5V_INTER
D1
RB160M-60
C7
10u
R41
7R5
L1
22uH
R40
10k
MN1
CP2122ST
SW
1
GND
2
FB
3
SHDN#
4
VIN
5
C9
2.2u
CHANGE#
TWD0
KEY4
KEY3
KEY2
KEY1
TWCK0
RESET#
TWD0
RESET#
CHANGE#
TWCK0
3V3_LCD
3V3_LCD
3V3_LCD
C14
100n
MN5
QT1070_SOIC
VDD
1
MODE(VSS)
2
SDA
3
RESET
4
CHANGE
5
SCL
6
KEY6
7
KEY5
8
KEY4
9
KEY3
10
KEY2
11
KEY1
12
KEY0
13
VSS
14
C16
100n
R57
4.7k
DNP
R62
4.7k
DNP
K4
KEY
R59
4.7k
DNP
MN4
QT1070
DNP
NC4
7
NC3
10
NC2
18
NC1
19
NC0
20
SDA
12
CHANGE
14
RESET
13
NC5
6
SCL
15
KEY4
1
KEY3
2
KEY2
3
KEY1
4
KEY0
5
VDD
9
MODE(
VSS)
11
VSS
8
KEY6
16
KEY5
17
Therm
a
l
21
R61
4.7k
DNP
K2
KEY
R56
4.7k
R58
4.7k
DNP
R68
4.7k
R65
4.7k
R66
4.7k
R67
4.7k
R60
4.7k
DNP
R63
10k
K3
KEY
K1
KEY
ONE_WIRE
3V3_LCD
MN2
DS2433S
NC1
1
NC2
2
DATA
3
GND
4
NC3
5
NC4
6
NC5
7
NC6
8
R45
4.7k
