AS1105 데이터 시트보기 (PDF) - austriamicrosystems AG
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AS1105 Datasheet PDF : 12 Pages
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Data Sheet AS1105
Duty Cycle D7 D6 D5 D4 D3 D2 D1 D0
1/32 (min on) X X X X 0 0 0 0
3/32
XXXX0 00 1
5/32
XXXX0 01 0
7/32
XXXX0 01 1
9/32
XXXX0 10 0
11/32
XXXX0 10 1
13/32
XXXX0 11 0
15/32
XXXX0 11 1
17/32
XXXX1 00 0
19/32
XXXX1 00 1
21/32
XXXX1 01 0
23/32
XXXX1 01 1
25/32
XXXX1 10 0
27/32
XXXX1 10 1
29/32
XXXX1 11 0
31/32 (max on) X X X X 1 1 1 1
Hex Code
0xX0
0xX1
0xX2
0xX3
0xX4
0xX5
0xX6
0xX7
0xX8
0xX9
0xXA
0xXB
0xXC
0xXD
0xXE
0xXF
Table 7: Intensity register format (address (hex) = 0xXA)
Scan Limit
Display digit 0 only
Display digits 0 & 1
Display digits 0 1 2
Display digits 0 1 2 3
D7
D6
Register Data
D5 D4 D3 D2
D1
D0
Hex Code
XXXXX00 0
0xX0
XXXXX00 1
0xX1
XXXXX01 0
0xX2
XXXXX01 1
0xX3
Table 8: Scan-limit register format (address (hex) = 0xXB)
Display Test Register
With the display test register 0Fh all LED can be tested. In
the test mode all LEDs are switched on at maximum
brightness (duty cycle 31/32). All programming of digit and
control registers is maintained. The format of the register is
given in table 10.
Number of
Digits
Displayed
1
2
3
Maximum
Segment Current
(mA)
10
20
30
Table 9: Maximum segment current for 1-, 2-, or 3-digit displays
Mode
Register Data
D7 D6 D5 D4 D3 D2 D1 D0
Normal Operation X X X X X X X 0
Display Test
Mode
XXXXXXX1
Table 10: Display-test register format (address (hex) = 0xXF)
Note: The AS1105 remains in display-test mode until the
display-test register is reconfigured for normal operation.
No-Op Register (Cascading of AS1105)
The no-operation register 00h is used when AS1105s are
cascaded in order to support more than 4 digit displays. The
cascading must be done in a way that all DOUT are
connected to DIN of the following AS1105. The LOAD and
CLK signals are connected to all devices. For a write
operation for example to the fifth device the command must
be followed by four no-operation commands.
Revision 1.32, Oct. 2004
Page 7 of 12
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