AS1105 데이터 시트보기 (PDF) - austriamicrosystems AG
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AS1105 Datasheet PDF : 12 Pages
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Data Sheet AS1105
4x8 LED Dot Matrix Driver
The example in Figure 3 uses the AS1105 to drive an 4x8 LED dot matrix. The LED columns have common cathode
and are connected to the DIG0-3 outputs. The rows are connected to the segment drivers. Each of the 32 LEDs can
be addressed separately. The columns are selected via the digits as shown in Table 2. The decode mode register
(0xX9) has to be programmed to ‘00000000’ as stated in Table 4. The single LEDs in a column can be addressed as
stated in Table 6, where D0 corresponds to segment G and d/ to segment DP. For a multiple digit dot matrix several
AS1105 have to be cascaded.
Diode Arrangement
SEG G
SEG F
SEG E
SEG D
SEG C
SEG B
SEG A
SEG DP
4x8 LED Dot
M ti
DIG 0
DIG 3
SEG A-G
SEP DP
DIG 0-3
DOUT
24
1
DIN
19
VDD
VBAT
µP
12 LOA
1 CLK
9 GND GND
ISET 18
9.53k
4
SEG G
SEG F
SEG E
SEG D
SEG C
SEG B
SEG A
SEG DP
4x8 LED Dot
M ti
DIG 0
DIG 3
SEG A-G DIG 0-3
SEP DP
1
DIN
12 LOA
1 CLK
9 GND GND
19
VDD
ISET 18
4
VBAT
9.53k
Figure 3: Application example as LED dot matrix driver
Cascading Drivers
The AS1105 can be cascaded as well. The DOUT pin must be connected to the DIN pin of the following AS1105.
Package
Thermal Resistance (θJA)
20 Wide SO
+85°C/W
Maximum Junction Temperature (TJ) = +150°C
Maximum Ambient Temperature (TA) = +85°C
Table 13: Package thermal resistance data
Revision 1.32, Oct. 2004
Page 9 of 12
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