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参数资料
型号： AS1116-BSST
厂商： AUSTRIAMICROSYSTEMS AG
元件分类： LED驱动器
英文描述： 64LED multi, 5.5mA, Diagnostic
文件页数： 18/24页
文件大小： 1166K
代理商： AS1116-BSST
17 - 23
AS1116
Datasheet - Typical Application
9 Typical Application
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, operating voltages, and LED volt-
age drop (V
LED
) are given in
Table 21
&
Table 22
. The maximum current the AS1116 can drive is 47mA. If higher currents are needed, exter-
nal drivers must be used, in which case it is no longer necessary that the devices drive high currents.
Note:
The display brightness can also be logically controlled
(see Intensity Control Register (0x0A) on page 15)
.
Calculating Power Dissipation
The upper limit for power dissipation (PD) for the AS1116 is determined from the following equation:
PD = (V
DD
x 5mA) + (V
DD
- V
LED
)(DUTY x I
SEG
x N)
(EQ 1)
Where:
V
DD
is the supply voltage.
DUTY
is the duty cycle set by intensity register
(page 15)
.
N
is the number of segments driven (worst case is 8)
V
LED
is the LED forward voltage
I
SEG
= segment current set by RSET
Dissipation Example:
I
SEG
= 40mA, N = 8, DUTY = 15/16, V
LED
= 2.2V at 40mA, V
DD
= 5V
(EQ 2)
PD = 5V(5mA) + (5V - 2.2V)(15/16 x 40mA x 8) = 0.865W
(EQ 3)
Thus, for a QSOP-24 package
Θ
JA
= +88°C/W, the maximum allowed T
AMB
is given by:
T
J,MAX
= T
AMB
+ PD x
Θ
JA
= 150°C = T
AMB
+ 0.865W x 88°C/W
(EQ 4)
In this example the maximum ambient temperature must stay below 73.88°C.
Table 21. R
SET
vs. Segment Current and LED Forward Voltage, V
DD
= 2.7V & 3.3V & 3.6V
I
SEG
(mA)
V
LED
V
LED
2.0V
6.4k
8.8k
13.3k
27.7k
V
LED
1.5V
5k
6.9k
10.7k
22.2k
2.0V
4.4k
5.9k
9.6k
20.7k
1.5V
6.7k
9.1k
13.9k
28.8k
2.5V
5.7k
8.1k
12.6k
26k
1.5V
7.5k
10.18k
15.6k
31.9k
2.0V
7.2k
9.8k
15k
31k
2.5V
6.6k
9.2k
14.3k
29.5k
3.0V
5.5k
7.5k
13k
27.3k
40
30
20
10
V
D
V
D
V
D
Table 22. R
SET
vs. Segment Current and LED Forward Voltage, V
DD
= 4.0V & 5.0V
I
SEG
(mA)
40
30
20
10
V
LED
2.5V
7.9k
10.8k
16.6k
34.5k
V
LED
1.5V
8.6k
11.6k
17.7k
36.89k
2.0V
8.3k
11.2k
17.3k
35.7k
3.0V
7.6k
9.9k
15.6k
32.5k
3.5V
5.2k
7.8k
13.6k
29.1k
1.5V
11.35k
15.4k
23.6k
48.9k
2.0V
11.12k
15.1k
23.1k
47.8k
2.5V
10.84k
14.7k
22.6k
46.9k
3.0V
10.49k
14.4k
22k
45.4k
3.5V
10.2k
13.6k
21.1k
43.8k
4.0V
9.9k
13.1k
20.2k
42k
V
D
V
D
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