AS1107WL-T austriamicrosystems, AS1107WL-T Datasheet - Page 14

• Manufacturer Part Number: AS1107WL-T
• Description: IC LED 8-DIGIT DRIVER 24-SOIC
• Manufacturer: austriamicrosystems

Specifications of AS1107WL-T

• Display Type: LED
• Configuration: 7 Segment + DP
• Interface: Serial
• Digits Or Characters: 8 Digits
• Current - Supply: 330mA
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS1107WL-TTR

AS1106, AS1107
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 AS1106/AS1107 should be placed very close to the LED display to minimize effects of
electromagnetic interference and wiring inductance.
Furthermore, it is recommended to connect a 10µF electrolytic and a 0.1µF ceramic capacitor between pins V
supply ripple (see Figure 14 on page 16).
Note: Both GND pins must be connected to ground.
9.2 Selecting R
Brightness of the display segments is controlled via R
the LEDs.
Segment current is about 200 times the current in I
voltage drop (V
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,
Note: The display brightness can also be logically controlled (see Intensity Control Register (0xXA) on page 12).
Table 19. R
Table 20. R
Table 21. R
Table 22. R
www.austriamicrosystems.com/LED-Driver-ICs/AS1106_07
I
I
I
I
SEG
SEG
SEG
SEG
40
30
20
10
40
30
20
10
40
30
20
10
40
30
20
10
(mA)
(mA)
(mA)
(mA)
SET
SET
SET
SET
LED
vs. Segment Current and LED Forward Voltage, V
vs. Segment Current and LED Forward Voltage, V
vs. Segment Current and LED Forward Voltage, V
vs. Segment Current and LED Forward Voltage, V
) are given in Tables 19 - 23. The maximum current the AS1106/AS1107 devices can drive is 40mA. If higher currents are
36.89kΩ
SET
17.7kΩ
11.6kΩ
10.18kΩ
8.6kΩ
10.7kΩ
22.2kΩ
13.9kΩ
28.8kΩ
15.6kΩ
31.9kΩ
6.9kΩ
6.7kΩ
9.1kΩ
7.5kΩ
1.5
5kΩ
1.5
1.5
1.5
Resistor Value and Using External Drivers
V
LED
(V)
11.2kΩ
17.3kΩ
35.7kΩ
8.3kΩ
2.0
V
SET
Table 16
20.7kΩ
13.3kΩ
27.7kΩ
4.4kΩ
5.9kΩ
9.6kΩ
6.4kΩ
8.8kΩ
7.2kΩ
9.8kΩ
LED
15kΩ
31kΩ
2.0
2.0
2.0
SET
. Typical values for R
(V)
. The current that flows between V
specifies the maximum currents, and R
V
LED
DD
DD
DD
DD
Revision 2.28
(V)
V
10.8kΩ
16.6kΩ
34.5kΩ
= 2.7V
= 3.3V
= 3.6V
= 4.0V
7.9kΩ
LED
2.5
(V)
SET
12.6kΩ
14.3kΩ
29.5kΩ
5.7kΩ
8.1kΩ
6.6kΩ
9.2kΩ
26kΩ
2.5
2.5
for different segment currents, operating voltages, and LED
DD
15.6kΩ
32.5kΩ
7.6kΩ
9.9kΩ
and I
3.0
SET
SET
27.3kΩ
must be set accordingly.
5.5kΩ
7.5kΩ
13kΩ
defines the current that flows through
3.0
DD
and GND to avoid power
13.6kΩ
29.1kΩ
5.2kΩ
7.8kΩ
3.5
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