Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet

11186A–ATARM–29-Nov-12

LCD with Touch Panel

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.

Back Light Control

C18

DNP

R 42

DNP

C17

D NP

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

DC LK

30

DI SP

31

H SYNC

32

VSYNC

33

DE

34

NC

35

DGND

36

X+

37

Y-

38

X-

39

Y+

40

DG

M

D

41

DG

M

D

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

VSYNC

HSY NC

DI SP

VCLK

R77

0R

R79

0R

R78

0R

Red2

Red1

Red0

Green1

Green0

Red7

Red6

Red4

Red3

Green6

Green5

Green4

Green3

Green2

Blue3

Blue2

Blue1

Blue0

Green7

Red5

Blue7

Blue6

Blue5

Blue4

C20

100n

R44
4. 7K

R90

0R

R89

0R

R92

0R

R91

0R

PIN 1

PIN 40

M1

R5

 

50V

5V/217mA

10V

VLED -

VLED +

C9
2.2u

5V_IN TER

LC D PWM

C 7
10u

300mV

L1
22uH

R 41
7.5R

R40
10k

MN 1

C P2123ST-A1

SW

1

GN D

2

FB

3

SH D N #

4

VIN

6

OVP

5

D1

RB160M-60

60V/1A

880mA

R 43

0R