Chrontel CH7511B Руководство по проектированию - Страница 7
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CHRONTEL
• GLED, OLED
GLED and OLED pins output LED control signals to determine if the CH7511B/7512B is in normal or abnormal
power and mode status. If GLED has output (3.3V), the CH7511B/7512B is in normal status. If OLED has output
(flickers from 0 or 3.3V), the CH7511B/7512B is in abnormal status. The design is shown in Figure 7.
CH7511
• BLUP, BLDN
1.
BLUP is the increase backlight brightness input pin.
2.
BLDN is the decrease backlight brightness input pin.
Buttons can be placed at these pins to adjust the backlight brightness. The design is shown in Figure 8.
• PWRDN
The CH7511B/7512B enters into or exits power down state when receiving an active low pulse from this pin. The
connection is shown in Figure 8.
206-1000-014
Rev. 1.7
+3.3V
G LED
G LED
G LED
G LED
G LED
G LED
G LED
G LED
G LED
G LED
G LED
G LED
G LED
1
R1
10k
57
G LED
O LED
O LED
58
O LED
Figure 7: LED Control
2020-07-14
R2
100
D1
+3.3V
P504CT-ND
Q 1
BS S138CT-ND
R4
100
D2
P504CT-ND
Q 2
BS S138CT-ND
1
R3
10k
AN-B014
7