AS1106 데이터 시트보기 (PDF) - austriamicrosystems AG
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AS1106 Datasheet PDF : 20 Pages
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AS1106, AS1107
Data Sheet
austriamicrosystems
Digit- and Control-Registers
Intensity Control Register (0xXA)
The brightness of the display can be controlled by digital means using the Intensity Control Register and by analog
means using RSET (see Selecting RSET Resistor Value and Using External Drivers on page 13).
Display brightness is controlled by an integrated pulse-width modulator which is controlled by the lower-nibble of the
Intensity Control Register. The modulator scales the average segment-current in 16 steps from a maximum of 31/32
down to 1/32 (15/16 to 1/16 for the AS1107) of the peak current set by RSET.
Table 13. Intensity Register Format (Address (HEX) = 0xXA))
Duty Cycle
AS1106
AS1107
1/32 (min on) 1/16 (min on)
3/32
2/16
5/32
3/16
7/32
4/16
9/32
5/16
11/32
6/16
13/32
7/16
15/32
8/16
17/32
9/16
19/32
10/16
21/32
11/16
23/32
12/16
25/32
13/16
27/32
14/16
29/32
15/16
31/32 (max on) 15/16 (max on)
HEX Code
0xX0
0xX1
0xX2
0xX3
0xX4
0xX5
0xX6
0xX7
0xX8
0xX9
0xXA
0xXB
0xXC
0xXD
0xXE
0xXF
Register Data
D7 D6 D5 D4 D3 D2 D1 D0
X
X
X
X
0
0
0
0
X
X
X
X
0
0
0
1
X
X
X
X
0
0
1
0
X
X
X
X
0
0
1
1
X
X
X
X
0
1
0
0
X
X
X
X
0
1
0
1
X
X
X
X
0
1
1
0
X
X
X
X
0
1
1
1
X
X
X
X
1
0
0
0
X
X
X
X
1
0
0
1
X
X
X
X
1
0
1
0
X
X
X
X
1
0
1
1
X
X
X
X
1
1
0
0
X
X
X
X
1
1
0
1
X
X
X
X
1
1
1
0
X
X
X
X
1
1
1
1
Scan-Limit Register (0x0B)
The Scan-Limit Register controls which of the digits are to be displayed. When all 8 digits are to be displayed, the
update frequency is typically 800Hz. If the number of digits displayed is reduced, the update frequency is increased.
The frequency can be calculated using 8fOSC/N, where N is the number of digits. Since the number of displayed digits
influences the brightness, RSET should be adjusted accordingly. Table 15 lists the maximum allowed current when
fewer than 4 digits are used.
Note: To avoid differences in brightness this register should not be used to blank parts of the display (leading zeros).
Table 14. Scan-Limit Register Format (Address (HEX) = 0xXB))
Scan Limit
Register Data
HEX Code
D7 D6 D5 D4 D3 D2 D1 D0
Display digit 0 only (see Table 15)
0xX0
X
X
X
X
X
0
0
0
Display digits 0:1 (see Table 15)
0xX1
X
X
X
X
X
0
0
1
Display digits 0:2 (see Table 15)
0xX2
X
X
X
X
X
0
1
0
Display digits 0:3
0xX3
X
X
X
X
X
0
1
1
Display digits 0:4
0xX4
X
X
X
X
X
1
0
0
Display digits 0:5
0xX5
X
X
X
X
X
1
0
1
Display digits 0:6
0xX6
X
X
X
X
X
1
1
0
Display digits 0:7
0xX7
X
X
X
X
X
1
1
1
Table 15. Maximum Segment Current for 1-, 2-, or 3-Digit Displays
Number of Digits Displayed
1
2
3
Maximum Segment Current (mA)
10
20
30
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Revision 2.2
11 - 20
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