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AS1106PL 数据表(PDF) 13 Page - ams AG

部件名 AS1106PL
功能描述  8-Digit LED Display Drivers
PDF  20 Pages
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制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS1106PL 数据表(HTML) 13 Page - ams AG

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www.austriamicrosystems.com
Revision 2.2
13 - 20
AS1106, AS1107
austriamicrosystems
Data Sheet
Supply Bypassing and Wiring
8 Typical Application
Supply Bypassing and Wiring
In order to achieve optimal performance the AS1106/AS1107 should be placed very close to the LED display to mini-
mize effects of electromagnetic interference and wiring inductance.
Furthermore, it is recommended to connect a 10µF electrolytic and a 0.1µF ceramic capacitor between pins VDD and
GND to avoid power supply ripple (see Figure 13 on page 15).
Note: Both GND pins must be connected to ground.
Selecting RSET Resistor Value and Using External Drivers
Brightness of the display segments is controlled via RSET. The current that flows between VDD and ISET defines the
current that flows through the LEDs.
Segment current is about 200 times the current in ISET. Typical values for RSET for different segment currents, operat-
ing voltages, and LED voltage drop (VLED) are given in Tables 18 - 22. The maximum current the AS1106/AS1107
devices can drive is 40mA. If higher currents are needed, external drivers must be used, in which case it is no longer
necessary that the devices drive high currents.
In cases where the devices only drive a few digits, Table 15 specifies the maximum currents, and RSET must be set
accordingly.
Note: The display brightness can also be logically controlled (see Intensity Control Register (0xXA) on page 11).
Table 18. RSET vs. Segment Current and LED Forward Voltage, VDD = 2.7V
ISEG (mA)
VLED(V)
1.5
2.0
40
5k
Ω
4.4k
Ω
30
6.9k
Ω
5.9k
Ω
20
10.7k
Ω
9.6k
Ω
10
22.2k
Ω
20.7k
Ω
Table 19. RSET vs. Segment Current and LED Forward Voltage, VDD = 3.3V
ISEG (mA)
VLED(V)
1.5
2.0
2.5
40
6.7k
Ω
6.4k
Ω
5.7k
Ω
30
9.1k
Ω
8.8k
Ω
8.1k
Ω
20
13.9k
Ω
13.3k
Ω
12.6k
Ω
10
28.8k
Ω
27.7k
Ω
26k
Ω
Table 20. RSET vs. Segment Current and LED Forward Voltage, VDD = 3.6V
ISEG (mA)
VLED(V)
1.5
2.0
2.5
3.0
40
7.5k
Ω
7.2k
Ω
6.6k
Ω
5.5k
Ω
30
10.18k
Ω
9.8k
Ω
9.2k
Ω
7.5k
Ω
20
15.6k
Ω
15k
Ω
14.3k
Ω
13k
Ω
10
31.9k
Ω
31k
Ω
29.5k
Ω
27.3k
Ω
Table 21. RSET vs. Segment Current and LED Forward Voltage, VDD = 4.0V
ISEG (mA)
VLED(V)
1.5
2.0
2.5
3.0
3.5
40
8.6k
Ω
8.3k
Ω
7.9k
Ω
7.6k
Ω
5.2k
Ω
30
11.6k
Ω
11.2k
Ω
10.8k
Ω
9.9k
Ω
7.8k
Ω



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