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Datasheet: AS1109 8-Bit LED Driver with Diagnostics
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A S 110 9
Constant-Current, 8-Bit LED Driver with Diagnostics
1 General Description
The AS1109 is designed to drive up to 8 LEDs through a fast serial
interface and features 8 output constant current drivers and an on-
chip diagnostic read-back function.
The high clock-frequency (up to 50MHz), adjustable output current,
and flexible serial interface makes the device perfectly suited for
high-volume transmission applications.
Output current is adjustable (up to 100mA/channel) using an external
resistor (R
EXT
).
The serial interface with Schmitt trigger inputs includes an integrated
shift register. Additionally, an internal data register stores the
currently displayed data.
The device features integrated diagnostics for over-
temperature, open-LED, and shorted-LED conditions. Integrated
registers store global fault status information during load as well as
the detailed temperature/open-LED/shorted-LED diagnostics results.
The AS1109 also features a low-current diagnostic mode to minimize
display flicker during fault testing.
With an operating temperature range from -40 to +125°C the
AS1109 is also ideal for industrial applications.
The AS1109 is available in a 16-pin SOIC-150, a 16-pin QFN
(4x4mm) and the 16-pin QSOP-150 package.
2 Key Features
8 Constant-Current Output Channels
Excellent Output Current Accuracy
- Between Channels: ±2%
- Between AS1109 Devices: ±2%
Output Current Per Channel: 0.5 to 100mA
Controlled In-Rush
Current
Over-Temperature, Open-LED, Shorted-LED
Diagnostics Functions
Low-Current Test Mode
Global Fault Monitoring
Low Shutdown Mode Current: 3µA
Fast Serial Interface: up to 50MHz
Cascaded Configuration
Fast Output Drivers Suitable for PWM
16-pin SOIC-150,
16-pin QFN (4x4mm) and 16-pin QSOP-150
Package
3 Applications
The device is ideal for fixed- or slow-rolling displays using static or
multiplexed LED matrix and dimming functions, large LED matrix
displays, mixed LED display and switch monitoring, displays in
elevators, public transports (underground, trains, buses, taxis,
airplanes, etc.), large displays in stadiums and public areas, price
indicators in retail stores, promotional panels, bar-graph displays,
industrial controller displays, white good panels, emergency light
indicators, and traffic signs.
Figure 1. Main Diagram and Pin Assignments
+V
LED
GND
1
OUTN0
OUTN1
OUTN2
OUTN3
OUTN4
OUTN5
OUTN6
OUTN7
SDI 2
CLK
3
SDI
16
V
DD
15 REXT
14 SDO
AS1109
LD
4
SDO
OUTN0 5
OUTN1 6
AS1109
13 OEN
12 OUTN7
11 OUTN6
10 OUTN5
9 OUTN4
CLK
LD
OEN
REXT
GND
V
DD
OUTN2 7
OUTN3 8
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Revision 1.21
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AS1109
Datasheet
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
SDI
GND
1
SDI 2
CLK
3
LD
4
OUTN0
5
OUTN1
6
OUTN2
7
OUTN3
8
16-pin QSOP-150
16-pin SOIC-150
16
VDD
15 REXT
14 SDO
CLK
LD
OUTN0
OUTN1
1
2
3
4
5
OUTN2
16
GND VDD
REXT
15
14
13
12 SDO
AS1109
13 OEN
12
OUTN7
11
OUTN6
10
OUTN5
9
OUTN4
AS1109
16-pin QFN
(4x4mm)
11 OEN
10
OUTN7
9
OUTN6
6
OUTN3
7
OUTN4
8
OUTN5
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
16-pin QSOP-150
16-pin SOIC-150
16-pin QFN
(4x4mm)
Pin Name
GND
SDI
CLK
LD
OUTN0:7
Ground
Serial Data Input
Description
1
2
3
4
5:12
15
16
1
2
3:10
Serial Data Clock.
The rising edge of the CLK signal is used to clock data into and at
the falling edge out of the AS1109 shift register. In error mode, the rising edge of the CLK
signal is used to switch error modes.
Serial Data Load.
Data is transferred to the data register at the rising edge of this pin.
Output Current Drivers.
These pins are used as LED drivers or for input sense for
diagnostic modes.
Output Enable.
The active-low pin OEN signal can always enable output drivers to sink
current independent of the AS1109 mode.
0 = Output drivers are enabled.
1 = Output drivers are disabled.
Serial Data Output.
In normal mode SDO is clocked out 8.5 clock cycles after SDI is
clocked in.
In global error detection mode this pin indicates the occurrence of a global error.
0 = Global error mode returned an error.
1 = No errors.
External Resistor Connection.
This pin connects through the external resistor (R
EXT
)
to GND, to setup the load current.
Positive Supply Voltage
13
11
OEN
14
12
SDO
15
16
13
14
REXT
V
DD
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Revision 1.21
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AS1109
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in
Table 2
may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in
Electrical Characteristics on page 4
is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Electrical Parameters
VDD to GND
Input Voltage
Output Voltage
GND Pin Current
Input Current (latch-up immunity)
Electrostatic Discharge
Electrostatic Discharge HBM
Temperature Ranges and Storage Conditions
33
Thermal Resistance
Θ
JA
Storage Temperature Range
-55
113
32
+150
ºC/W
ºC/W
ºC/W
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/
JEDEC J-STD-020“Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State Surface
Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
Represents a maximum floor life time of unlimited
Represents a maximum floor life of 168h
on PCB, 16-pin SOIC-150 package
on PCB, 16-pin QSOP-150 package
on PCB, 16-pin QFN (4x4mm) package
2
kV
Norm: MIL 883 E method 3015
-100
-0.3
-0.4
-0.4
7
V
DD
+ 0.4
15
1000
100
V
V
V
mA
mA
Norm: JEDEC 78
Min
Max
Units
Comments
Package Body Temperature
+260
ºC
Humidity non-condensing
QFN and QSOP
Moisture Sensitive Level
Moisture Sensitive
Layer (SOIC)
5
1
3
85
%
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Revision 1.21
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AS1109
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
V
DD
= +3.0V to +5.5V, Typical values measured at V
DD
= 5V, T
AMB
= 25°C (unless otherwise specified).
Table 3. Electrical Characteristics
Symbol
T
AMB
V
DD
V
DS
I
OUT
I
OH
I
OL
V
IH
Input Voltage
V
IL
I
DS(OFF)
V
OL
V
OH
I
AV(LC1)
ΔI
AV(LC1)
I
AV(LC2)
ΔI
AV(LC2)
I
AV(LC3)
ΔI
AV(LC3)
I
LC
I
PD
%/ΔV
DS
%/ΔV
DD
R
IN(UP)
R
IN(DOWN)
V
THL
*
*
Parameter
Operating Temperature Range
Supply Voltage
Output Voltage
Output Current
Condition
Device fully functional up to 125°C
OUTN0:7
OUTN0:7, V
DD
= 5V
(see Figure 8)
SDO
SDO
Min
-40
3.0
0
0.5
-1.0
1.0
0.7 x
V
DD
-0.3
Typ
Max
+85
5.5
15.0
100
Unit
°C
V
V
mA
High Level
CLK, OEN, LD, SDI
Low Level
Output Leakage Current
Output
Voltage
SDO
OEN = 1, V
DS
= 15.0V
I
OL
= +1.0mA
I
OH
= -1.0mA
V
DS
= 0.5V, V
DD
= Const.,
R
EXT
= 744Ω
V
DS
≥
0.5V, V
DD
= Const.,
R
EXT
= 744Ω
V
DS
= 0.6V, V
DD
> 3.3V,
R
EXT
= 372Ω
V
DS
≥
0.6V, V
DD
= Const.,
R
EXT
= 372Ω
V
DS
= 0.8V, V
DD
= 5.0V,
R
EXT
= 186Ω
V
DS
≥
0.8V, V
DD
= Const.,
R
EXT
= 186Ω
V
DS
= 0.8V, V
DD
= 5.0V
V
DS
= 0.8V, V
DD
= 5.0V,
R
EXT
= 372Ω, OUTN0:7 = On
V
DS
within 1.0 and 3.0V
V
DD
within 3.0 and 5.0V
OEN
LD
No load
V
DD
= 3.0V, no load
V
DD
= 5.0V, no load
V
DD
+
0.3
0.3 x
V
DD
0.5
0.4
V
µA
V
V
DD
-
0.4V
24.5
25.26
±0.9
49.50
50.52
±0.8
98
101
±0.5
0.4
0.6
3
±0.1
±1
250
250
0.25
1.2
2.0
500
500
0.35
1.3
2.2
150
800
800
0.45
1.4
2.4
26
±3
51.55
±2
104
±2
0.8
20
Device-to-Device Average Output Current
from OUTN0 to OUTN7
Current Skew
(Between Channels)
Device-to-Device Average Output Current
from OUTN0 to OUTN7
Current Skew
(Between Channels)
Device-to-Device Average Output Current
from OUTN0 to OUTN7
Current Skew
(Between Channels)
Low-Current Diagnosis Mode
Power Down Supply Current
Output Current vs.
Output Voltage Regulation
Output Current vs.
Supply Voltage Regulation
Pullup Resistance
Pulldown Resistance
Open Error Detection Threshold Voltage
Short Error Detection Threshold Voltage
Overtemperature Threshold Flag
mA
%
mA
%
mA
%
mA
µA
%/V
%/V
kΩ
kΩ
V
V
ºC
V
THH
T
OV1
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Revision 1.21
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