AS1116
Datasheet - D e t a i l e d D e s c r i p t i o n
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 15/16
down to 1/16 of the peak current set by R
SET
.
Table 16. Intensity Register Format
Duty Cycle
HEX Code
Register Data
MSB D2
D1 LSB
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
Duty Cycle
HEX Code
Register Data
MSB D2
D1 LSB
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
1/16 (min on)
2/16
3/16
4/16
5/16
6/16
7/16
8/16
0xX0
0xX1
0xX2
0xX3
0xX4
0xX5
0xX6
0xX7
9/16
10/16
11/16
12/16
13/16
14/16
15/16
15/16 (max on)
0xX8
0xX9
0xXA
0xXB
0xXC
0xXD
0xXE
0xXF
Table 17. Intensity Register Address
Register HEX Address
0x0A
0x10
0x11
0x12
0x13
Register Data
Type
Global
Digit
Digit
Digit
Digit
D7:D4
X
Digit 1 Intensity
Digit 3 Intensity
Digit 5 Intensity
Digit 7 Intensity
D3:D0
Global Intensity
Digit 0 Intensity
Digit 2 Intensity
Digit 4 Intensity
Digit 6 Intensity
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 0.8kHz. 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, R
SET
should be adjusted accordingly.
Note:
To avoid differences in brightness this register should not be used to blank parts of the display (leading zeros).
Table 18. Scan-Limit Register Format (Address (HEX) = 0x0B))
Scan Limit
Register Data
HEX
Code D7:D3 D2 D1 D0
0xX0
X
0
0
0
0xX1
X
0
0
1
0xX2
X
0
1
0
0xX3
X
0
1
1
Scan Limit
Register Data
HEX
Code D7:D3 D2 D1 D0
0xX4
X
1
0
0
0xX5
X
1
0
1
0xX6
X
1
1
0
0xX7
X
1
1
1
Display digit 0 only
Display digits 0:1
Display digits 0:2
Display digits 0:3
Display digits 0:4
Display digits 0:5
Display digits 0:6
Display digits 0:7
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