Evaluation Kit Hardware
SAM4S-EK2 User Guide
4-7
11176A–ATARM–24-Sep-12
4.3.8.1
LCD Module
The LCD module gets reset from the NRST signal. As explained, this NRST is shared with the JTAG port
and the push-button BP1. The LCD chip select signal is connected to NCS1; the jumper JP13 can dis-
connect it so that this PIO line is available for other custom usage.
The SAM4SD32 communicates with the LCD through PIOC where an 8-bit parallel “8080-like” protocol
data bus has to be implemented in software.
Figure 4-8.
LCD Block
4.3.8.2
Backlight Control
The LCD backlight is made of four integrated white chip-LEDs arranged in parallel. These are driven by
an AAT3155 charge pump, MN8. The AAT3155 is controlled by the SAM4SD32 through a single PIO
line PC13 interface; the 0 Ohm resistor R68 is mounted in series on this line, which permits to use it for
other custom purposes. In that case, the pull-up resistor R64 maintains the charge pump permanently
enabled by default.
On the anode drive line, a 0 Ohm resistor R59 is implemented in series for an optional current limitation.
Figure 4-9.
Backlight Control
LCD_DB3
R5 9
0R
Six slots on PCB for LCD shield
PC11
R6 3
4.7 K
DNP
DG ND
LE D_A
PC26
LCD_DB2
NRST
PC8
LCD_DB0
PC27
LCD
C4 5
10 0nF
LCD_DB4
DG ND
J8
FH26- 39S -0.3 SHW
VDD
1
DB 17
2
DB 16
3
DB 15
4
DB 14
5
DB 13
6
DB 12
7
DB 11
8
DB 10
9
DB 9
10
DB 8
11
DB 7
12
DB 6
13
DB 5
14
DB 4
15
DB 3
16
DB 2
17
DB 1
18
DB 0
19
VDD
20
RD
21
WR
22
RS
23
CS
24
RE SE T
25
IM0
26
IM1
27
GND
28
LE D-A
29
LE DK 1
30
LE DK 2
31
LE DK 3
32
LE DK 4
33
Y+
34
Y-
35
X+
36
X-
37
NC
38
GND
39
PC28
DG ND
R4 9
47 K
X_ RIG HT
Y_ DO WN
Y_ UP
X_ LEFT
D1
PA CDN04 4Y5 R
TV S, S OT23-5
DNP
1
2
3
4
5
NOT POPULATED
The part is placed as
close as possible to J8
DG ND
PC29
DG ND
DG ND
DG ND
JP 13
He ade r2
LCD_DB9
LCD_DB13
LCD_DB12
LCD_DB11
LCD_DB10
LCD_DB16
LCD_DB15
LCD_DB14
PC30
LCD_DB17
R5 8
4.7 K
LCD_DB5
PC2
PC1
PC0
PC3
X_ LEFT
LCD_DB9
R5 6
10 K
PC6
PC5
PC4
PC7
PC23
X_ RIG HT
+3 V3
DG ND
DG ND
LCD_DB7
Y_ DO WN
LCD_DB8
Y_ UP
RA 2
4.7 Kx4
DNP
1
2
3
4
5
6
7
8
PC22
PC31
PC13
LCD_DB6
LCD_DB6
LCD_DB7
DG ND
PC15
PC[0..31]
LE D_K 4
LCD_DB8
LCD_DB4
LCD_DB5
LE D_K 3
LE D_K 2
PC24
PINs
on
BO T
PIN 39
PIN 1
Z7
FTM28 0C34D
LCD_DB2
LCD_DB3
LCD_DB1
LE D_K 1
NRST
RA 3
4.7 Kx4
DNP
1
2
3
4
5
6
7
8
PC19
LCD_DB0
LCD_DB1
C4 4
10 0nF
R6 1
4.7 K
DNP
DG ND
+3 V3
+
C4 3
10 uF
PC25
MN8
AA T31 55ITP- T1
C1 +
10
C1 -
9
EN/SE T
11
C2 +
7
C2 -
6
OUTCP
8
IN
5
GND
4
D1
3
D2
2
D3
1
D4
12
C5 5
1u F
C5 4
1u F
C5 7
4.7 uF
C5 6
1u F
R6 8
0R
R6 4
47 K
LE D_A
LE D_K 1
+3 V3
LE D_K 4
LE D_K 3
LE D_K 2
+3 V3
PC13
DG ND
DG ND
TP 7
FB 1
BN03K 31 4S3 00R
LCD BACKLIGHT
