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参数资料
| 型号： | AS1108WL-T |
| 厂商： | ams |
| 文件页数： | 15/21页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER LED 4-DIGIT 20-SOIC |
| 标准包装： | 1,500 |
| 显示器类型： | LED |
| 配置： | 7 段 + DP |
| 接口： | 串行 |
| 数字或字符： | 4 位数字 |
| 电流 - 电源： | 330mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 带卷 (TR) |
AS1108
Datasheet - Ty p i c a l A p p l i c a t i o n
9 Typical Application
Supply Bypassing and Wiring
In order to achieve optimal performance the AS1108 should be placed very close to the LED display to minimize
effects of electromagnetic interference and wiring inductance.
Furthermore, a 10μF electrolytic and a 0.1μF ceramic capacitor should be connected between pins V DD and GND to
Note: Both GND pins must be connected to ground.
Selecting R SET Resistor Value and Using External Drivers
Brightness of the display segments is controlled via R SET . The current that flows between V DD and I SET defines the
current that flows through the LEDs.
Segment current is about 200 times the current in I SET . Typical values for R SET for different segment currents, operat-
ing voltages, and LED voltage drop (V LED ) are given in Tables 19 - 23. The maximum current the AS1108 can drive is
40mA. If higher currents are needed, external drivers must be used, in which case it is no longer necessary that the
device drive high currents.
In cases where the device drives only a few digits, Table 16 specifies the maximum currents, and R SET must be set
accordingly.
Note: The display brightness can also be logically controlled (see Selecting RSET Resistor Value and Using External
Table 19. R SET vs. Segment Current and LED Forward Voltage, V DD = 2.7V
I SEG (mA)
40
30
20
10
1.5
5k ?
6.9k ?
10.7k ?
22.2k ?
V LED (V)
2.0
4.4k ?
5.9k ?
9.6k ?
20.7k ?
Table 20. R SET vs. Segment Current and LED Forward Voltage, V DD = 3.3V
I SEG (mA)
40
30
20
10
1.5
6.7k ?
9.1k ?
13.9k ?
28.8k ?
V LED (V)
2.0
6.4k ?
8.8k ?
13.3k ?
27.7k ?
2.5
5.7k ?
8.1k ?
12.6k ?
26k ?
Table 21. R SET vs. Segment Current and LED Forward Voltage, V DD = 3.6V
I SEG (mA)
40
30
20
10
1.5
7.5k ?
10.18k ?
15.6k ?
31.9k ?
2.0
7.2k ?
9.8k ?
15k ?
31k ?
V LED (V)
2.5
6.6k ?
9.2k ?
14.3k ?
29.5k ?
3.0
5.5k ?
7.5k ?
13k ?
27.3k ?
Table 22. R SET vs. Segment Current and LED Forward Voltage, V DD = 4.0V
I SEG (mA)
40
30
1.5
8.6k ?
11.6k ?
2.0
8.3k ?
11.2k ?
V LED (V)
2.5
7.9k ?
10.8k ?
3.0
7.6k ?
9.9k ?
3.5
5.2k ?
7.8k ?
Revision 2.13
14 - 20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1108WL-T-Z | 制造商:AMS 功能描述:0 |
| AS1108-XXX-I-A1-D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Filter |
| AS1108-XXX-I-A1-S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Filter |
| AS1108-XXX-I-A2-D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Filter |
| AS1108-XXX-I-A2-S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Filter |
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