N1_Hardware_User_Guide
Copyright © Neoway Technology Co., Ltd
27
Figure 4-2
N1LCD backlight chipset
VBATT_FET
10uF
LX
1 uF
OVP
GND
VIN
APW7209
EN
1
5
2
6
FB
WLED_PWM
100K
22uH
12
Ω
120
Ω
±25%
（
@100MHz
）
120
Ω
±25%
（
@100MHz
）
LED_K
4
3
LED_A
DCDC is used to drive LCD backlight and powered by external power supply. The brightness is
controlled by the PWM signal from the module. To control the power supply completely and reduce the
standby power consumption, use independent LDO to supply power to the backlight. 2.85V LDO circuit
is recommended to drive the IC inside LCD.
Figure 4-3
Power supply of N1LCD driver
EXT_2P8V_EN
1 µF
VOUT
2.2uF
GND
CE
VDD
SGM2036
VBATT_FET
GND
100K
VEXT_2P85V
1
2
5
3
4
DNI-0
Ω
VREG_L17_2P85V
Figure 4-4 shows the reference design of a customized 4.5' LCD interface.
4.5' QHD
NT35516 driver IC
480*800
240 dpi
Capacitive multi-touch
