User manual
SAM9N12/CN11-EK User Guide 6-3
11186A–ATARM–29-Nov-12
Figure 6-3. LCD with Touch Panel
6.3.3 Back Light
The back light voltage is generated from a CP2122ST boost converter. It is powered directly by the DC 5
V from the EK board. The back light level is controlled by a PWM signal generated from the
SAM9N12/CN11 processor.
Figure 6-4. Back Light Control
C18
DNP
R42
DNP
C17
DNP
C16
DNP
C19
DNP
TP_XR
TP_Y D
TP_XL
TP_Y U
R53 0R
R55 0R
R54 0R
R81 0R
R80 0R
R83 0R
R82 0R
R85 0R
R84 0R
R87 0R
R86 0R
R88 0R
R56 0R
R58 0R
R57 0R
R60 0R
R59 0R
R61 0R
R63 0R
R62 0R
R76 0R
J1
VLED-
1
VLED+
2
DGND
3
VDD
4
RED0
5
RED1
6
RED2
7
RED3
8
RED4
9
RED5
10
RED6
11
RED7
12
GREEN0
13
GREEN1
14
GREEN2
15
GREEN3
16
GREEN4
17
GREEN5
18
GREEN6
19
GREEN7
20
BLU E0
21
BLU E1
22
BLU E2
23
BLU E3
24
BLU E4
25
BLU E5
26
BLU E6
27
BLU E7
28
DGND
29
DCLK
30
DISP
31
HSYNC
32
VSYNC
33
DE
34
NC
35
DGND
36
X+
37
Y-
38
X-
39
Y+
40
DGMD
41
DGMD
42
3V3_LCD
R0
R4
R3
R2
R1
G3
G2
G1
G0
R7
R6
B0
G7
G6
G5
G4
B5
B4
B3
B2
B1
3V3_LCD
B7
B6
VLED+
VLED-
VDEN
VSY NC
HSY NC
DISP
VCLK
R77 0R
R79 0R
R78 0R
Red2
Red1
Red0
Gree n1
Gree n0
Red7
Red6
Red4
Red3
Gree n6
Gree n5
Gree n4
Gree n3
Gree n2
Blue3
Blue2
Blue1
Blue0
Gree n7
Red5
Blue7
Blue6
Blue5
Blue4
C20
100n
R44
4.7K
R90 0R
R89 0R
R92 0R
R91 0R
Conductors
on
TOP SIDE
PIN 1
PIN 40
4.3'' LCD,
480(H)×RGB×272(V)
M1
R5
50V
5V/217mA
10V
VLED-
VLED+
C9
2.2u
2 x5 LEDs Back Light
5V_INTER
LCDPWM
C7
10u
300mV
L1
22uH
R41
7.5R
R40
10k
MN1
CP2123ST-A1
SW
1
GND
2
FB
3
SHDN#
4
VIN
6
OVP
5
D1
RB160M-60
60V/1A
880mA
R43 0R