AS1106 데이터 시트보기 (PDF) - austriamicrosystems AG
부품명
상세내역
제조사
AS1106 Datasheet PDF : 20 Pages
| |||
AS1106, AS1107
Data Sheet
austriamicrosystems
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)
40
VLED(V)
1.5
2.0
5kΩ
4.4kΩ
30
6.9kΩ
5.9kΩ
20
10.7kΩ
10
22.2kΩ
9.6kΩ
20.7kΩ
Table 19. RSET vs. Segment Current and LED Forward Voltage, VDD = 3.3V
ISEG (mA)
40
30
20
10
1.5
6.7kΩ
9.1kΩ
13.9kΩ
28.8kΩ
VLED(V)
2.0
6.4kΩ
8.8kΩ
13.3kΩ
27.7kΩ
2.5
5.7kΩ
8.1kΩ
12.6kΩ
26kΩ
Table 20. RSET vs. Segment Current and LED Forward Voltage, VDD = 3.6V
ISEG (mA)
40
1.5
7.5kΩ
2.0
7.2kΩ
VLED(V)
2.5
6.6kΩ
30
10.18kΩ
9.8kΩ
9.2kΩ
20
15.6kΩ
10
31.9kΩ
15kΩ
31kΩ
14.3kΩ
29.5kΩ
3.0
5.5kΩ
7.5kΩ
13kΩ
27.3kΩ
Table 21. RSET vs. Segment Current and LED Forward Voltage, VDD = 4.0V
ISEG (mA)
40
30
1.5
8.6kΩ
11.6kΩ
2.0
8.3kΩ
11.2kΩ
VLED(V)
2.5
7.9kΩ
10.8kΩ
3.0
7.6kΩ
9.9kΩ
3.5
5.2kΩ
7.8kΩ
www.austriamicrosystems.com
Revision 2.2
13 - 20
Share Link: 