HT1635A/B Wearable Sports Bracelet LED Display Application
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AN0393E
Demo H/W Block Diagram
System Block Diagram
Bottom Board
Top Board
RGB LED Matrix
(8COM x 42ROW x 2)
HT1635
A
/
B
x 2
(64LQFP)
COM/ROW
4-wire
/
I
2
C
Power Supply Circuit
AC100V~240V
DC 5V
18650 Li+ Battery
DC-DC Boost Circuit
(SY7066)
Micro USB
AC-DC Converter
(FAS10-5-W)
HT66F50
(28SOP)
Li+ Battery
Charger
(APL3202)
Key
x 1
Figure 1 System Block Diagram
The demo PCB is composed of two boards, a top board and a bottom board. The top
board is an RGB LED Matrix board and the bottom board is a power control board. These
two boards are connected using a pin header.
•
RGB LED Matrix
Two HT1635A devices or two HT1635B devices jointly drive an RGB LED Matrix
composed of 8 commons and 28 rows.
•
Power Supply Circuit
The power supply circuit provides three power supply methods, AC power (100~240V
AC
),
power adapter (DC5V, Micro USB interface) and a Li-battery (one 18650).
•
DC-DC Boost Circuit
When only using the Li-battery to supply power, enable the DC-DC boost IC (SY7066)
which will increase the battery voltage to 5V to supply power for the host MCU and the
HT1635A/HT1635B.
•
Li-Battery Charging Circuit
When using the AC power or the external power adapter to supply power, enable the
Li-battery charging management IC (APL3202) to charge the battery.
•
Key Section
A touch key is used for switching the display screens.
•
Host MCU Section
This demo uses the HT66F50 as the master control MCU to implement data
communication with the HT1635A/HT1635B and achieve various display functions.
