Display Interface; Backlight Control - Atmel SAM3N-EK User Manual

Figure 4-5.
4.3.7

Display Interface

The SAM3N-EK carries a TFT Transmissive LCD module with touch panel, TM020GDZ18. Its integrated
driver IC is ILI9225B. The LCD display area is 2.0 inches diagonally measured, with a native resolution
of 176x220 pixels.
The LCD module gets reset from GPIO PA29. The LCD chip select signal is connected to NPCS2. The
SAM3N communicates with the LCD through the SPI bus.
Figure 4-6.
4.3.8

Backlight Control

The LCD backlight is made of four integrated white chip-LEDs arranged in parallel. These are driven by
an AAT3193 charge pump, MN5. The AAT3193 is controlled by the SAM3N through a single PIO line
interface (PC13); the 0 Ohm resistor R17 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 R21 is implemented in series for an optional current limitation.
SAM3N-EK Development Board User Guide
UART
+3V3
C39 C39
100nF 100nF
+3V3 +3V3 C40 C40
100nF 100nF
R35 R35 R36 R36
100K 100K 100K 100K
PA10 R39 R39 0R 0R
PA9 R40 R40 0R 0R
R41 R41 0R 0R
DGND
TP6 TP6 TP7 TP7
SMD SMD SMD SMD
LCD
NPCS_LCD
PA30
SPI CLK
PA14
SPI MOSI
PA13
PA28
PA29
MN8 MN8
MAX3232CSE MAX3232CSE
16 1
VCC C1+
C38 C38
100nF 100nF
2 3
V+ C1-
6 4
V- C2+
C41 C41 C42 C42
100nF 100nF 100nF 100nF
15 5
GND C2-
11 14
T1IN T1OUT
12 13
R1OUT R1IN
10 7
T2IN T2OUT
9 8
R2OUT R2IN
UART
+3V3
+ +
C30 C30 C31 C31
R18 R18 R60 R60
10uF 10uF 100nF 100nF
47K 47K 47K 47K
DGND
R19 R19 0R 0R
R21 R21 0R 0R
LED_A
LED_K1
LED_K2
LED_K3
DGND
LCD
Evaluation Kit Hardware
J4 J4
1
6
2
7
3
8
4
9
5
DGND
FGND
MN6 MN6
TM020GDZ18 TM020GDZ18
1
ID
2
NCS
3
SCL
4
SDA
5
RS
6
NREST
7
GND
8
IOVDD
9
VDD
10
LEDA
11
LEDK1
12
LEDK2
13
LEDK3
14
Y+
15
Y-
16
X+
17
X-
18
NC
11080C–ATARM–30-Mar-11
4-5