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参数资料
| 型号： | AS1100WL-T |
| 厂商： | ams |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC LED 8-DIGIT DRIVER 24-SOIC |
| 标准包装： | 1 |
| 显示器类型： | LED |
| 配置： | 7 段 + DP |
| 接口： | 串行 |
| 数字或字符： | 8 位数字 |
| 电流 - 电源： | 330mA |
| 电源电压： | 4 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC |
| 包装： | 标准包装 |
| 产品目录页面： | 804 (CN2011-ZH PDF) |
| 其它名称： | AS1100WL-TDKR |
AS1100
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
9.1 Supply Bypassing and Wiring
In order to achieve optimal performance the AS1100 shall be placed very close to the LED display to minimize effects of electromagnetic
interference and wiring inductance. Furthermore, it is recommended to connect a 10 F electrolytic and a 0.1 F ceramic capacitor between V DD
and GND to avoid power supply ripple. Also, both GNDs must be connected to ground.
9.2 Selecting R SET Resistor and Using External Drivers
The current through the segments is controlled via the external resistor R SET . Segment current is about 100 times the current in ISET. The right
values for ISET are given in Table 15 . The maximum current the AS1100 can drive is 40mA. If higher currents are needed, external drivers must
be used. In that case it is no longer necessary that the AS1100 drives high currents. A recommended value for R SET is 47k ? . In cases that the
AS1100 only drives few digits, Table 12 specifies the maximum currents and R SET must be set accordingly. Refer to absolute maximum ratings
to calculate acceptable limits for ambient temperature, segment current, and the LED forward-voltage drop.
Table 15. R SET vs. Segment Current and LED Forward Voltage
I SEG (mA)
40
30
20
10
1.5
12.2k ?
17.8k ?
29.8k ?
66.7k ?
2.0
11.8k ?
17.1k ?
28.0k ?
63.7k ?
V LED (V)
2.5
11.0k ?
15.8k ?
25.9k ?
59.3k ?
3.0
10.6k ?
15.0k ?
24.5k ?
55.4k ?
3.5
9.69k ?
14.0k ?
22.6k ?
51.2k ?
9.3 8x8 LED Dot Matrix Driver
The example in Figure 7 uses the AS1100 to drive an 8x8 LED dot matrix. The LED columns have common cathode and are connected to the
DIG0-7 outputs. The rows are connected to the segment drivers. Each of the 64 LEDs can be addressed separately. The columns are selected
via the digits as shown in Table 5 . The decode mode register (0xX9) has to be programmed to ‘00000000’ as stated in Table 4. The single LEDs
in a column can be addressed as stated in Table 9 , where D0 corresponds to segment G and D7 corresponds to segment DP.
Note: For a multiple-digit dot matrix, multiple AS1100 devices must be cascaded.
Figure 7. Application Example as LED Dot Matrix Driver
SEG G
SEG F
SEG E
SEG D
SEG C
SEG B
SEG A
SEG DP
DIG 0
DIG 7
SEG G
SEG F
SEG E
SEG D
SEG C
SEG B
SEG A
SEG DP
DIG 0
DIG 7
SEG A:G
SEG DP
DIG0:7
DOUT
VDD
24
19
SEG A:G
SEG DP
DIG0:7
P
1
12
DIN
LOAD
AS1100
9.53k ?
1
DIN
VDD
19
13
9
CLK
GND
GND
4
ISET
18
12
13
9
LOAD
CLK
GND
AS1100
ISET
18
9.53k ?
GND
4
www.austriamicrosystems.com/LED-Driver-ICs/AS1100
Revision 1.37
11 - 16
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