Holtek HT1635A, Приложение

Страница: 9 / 19

HT1635A/B Wearable Sports Bracelet LED Display Application
9 / 19 AN0393E
Li-battery Charging Circuit
Figure 7 Li-battery Charging Circuit
When the MCU detects that an AC power or an external power adapter is connected, its
IO_BAT1_CHGEN port will output a high level to enable the Li-battery power
management IC, APL3202, which will charge one 18650 Li-battery. The APL3202 used in
this demo is APNEC’s product that has a supplied package type of SOT23-5, an input
voltage of 4.35V~6.5V and a charging current of 0.1A~0.5A which is adjustable by
changing the R18 resistance value. When the battery voltage is increased to 4.2V,
charging operation stops, when the battery voltage falls to 4.05V, charging operation
restarts. The R18 resistance value is 3K and the charging current is about 300mA. When
the LED D7 is on, it indicates that the Li-battery is charging, when it is off, it indicates that
the battery power is full.
RGB LED Matrix Driving Circuit
VIN
4
ISET
5
STAT
1
BATT
3
GND
2
U4
APL3202-SOT23-5
4.7uF
C12
1K R17
3K R18
VDD
IO_BAT1_CHGEN
D7
LED
10K
R19
10R
R20
1
2
J3
Li+ BAT/3.7V Battery Box
IO_CHG_DET
Q3
AO3400
ROW12
1
ROW11
2
ROW10
3
ROW9
4
ROW8
5
LED_VDD
6
ROW7
7
ROW6
8
ROW5
9
ROW4
10
ROW3
11
ROW2
12
ROW1
13
ROW0
14
VSS
15
OSC
16
D
A
TA
17
W
R
B
18
R
D
B
19
C
SB
20
SY
N
C
21
V
D
D
22
C
O
M
0
23
LE
D
_V
SS
24
C
O
M
1
25
C
O
M
2
26
C
O
M
3
27
C
O
M
4
28
C
O
M
5
29
C
O
M
6
30
C
O
M
7
31
LE
D
_V
SS
32
ROW43
33
ROW42
34
ROW41
35
ROW40
36
ROW39
37
ROW38
38
ROW37
39
ROW36
40
LED_VDD
41
ROW35
42
ROW34
43
ROW33
44
ROW32
45
ROW31
46
ROW30
47
ROW29
48
R
O
W
28
49
R
O
W
27
50
R
O
W
26
51
R
O
W
25
52
R
O
W
24
53
R
O
W
23
54
R
O
W
22
55
R
O
W
21
56
R
O
W
20
57
R
O
W
19
58
R
O
W
18
59
R
O
W
17
60
R
O
W
16
61
R
O
W
15
62
R
O
W
14
63
R
O
W
13
64
U1 HT1635-64LQPF
C
O
M
2
C
O
M
1
C
O
M
3
C
O
M
4
C
O
M
5
C
O
M
6
C
O
M
7
C
O
M
8
R1
G1
B1
R2
G2
B2
R3
R4
R
5
R
6
R
7
R
8
R
9
R10
R11
R12
R13
R14
G3
G4
G
5
G
6
G
7
G
8
G
9
G
10
G11
G12
G13
G14
B3
B4
B5
B
6
B
7
B
8
B
9
B
10
B11
B12
B13
B14
VDD1
VDD2
OSC
SYNC
CSB1
R
D
B
1
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R
14
R
15
R
16
R
17
R
18
R
19
R
20
R
21
R
22
R
23
R
24
R
25
R
26
R
27
R
28
R
29
R30
R31
R32
R33
R34
R35
R36
R37
R38
R39
R40
R41
R42
VDD1
0.1uF
C1
0.1uF
C2
VDD2
0.1uF
C3
NC
R136
NC
R137
NC
R138
NC
R139
VDD1
CSB1 300R R149
NC
C12
10
0R
R
14
8
1nF
C15
N
C
R
15
0
RDB1
W
R
B
D
A
TA
FB
/4
71
R
13
4
10
0R
R
13
5
NC
C16
NC
C13
220pF
C14