high
performance
needs great
design.
Datasheet: AS1110 Constant-Current, 16-Channel LED Driver
with Diagnostics
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www.ams.com
A S1110
Co nstant-C urrent, 16-C hannel LED Driver with Diagnostics
1 General Description
The AS1110 is designed to drive up to 16 LEDs through a fast serial
interface and features 16 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 AS1110 also features a low-current diagnostic mode to minimize
display flicker during fault testing.
The AS1110 is available in a 24-pin SSOP and the 28-pin QFN
(5x5mm) package.
2 Key Features
16 Constant-current output channels
Excellent output current accuracy
- Between channels: <±3%
- Between devices: <±3%
Output current per channel: 0.5mA to 100mA
Controlled In-rush current
Over-Temperature, Open-LED, Shorted-LED
Diagnostic functions
Low-current test mode
Global fault monitoring
Low shutdown mode current: 10µA
Fast serial interface: 50MHz
Cascaded configuration
Extremely fast output drivers suitable for PWM
24-pin SSOP and 28-pin QFN (5x5mm) 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
OUTN11
OUTN10
OUTN12
OUTN13
OUTN14
OUTN15
SDO
OUTN3
OUTN4
OUTN5
OUTN6
OUTN7
OUTN8
REXT
OUTN0
OUTN1
OUTN2
OUTN9
SDI
AS1110
CLK
LD
OEN
GND
V
DD
www.ams.com/LED-Driver-ICs/AS1110
Revision 1.6
1 - 24
AS1110
Datasheet
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
GND
GND
GND
GND
OUTN15
OUTN14
OUTN13
OUTN12
OUTN10
OUTN5
OUTN11
OUTN9
OUTN6
CLK
LD
OUTN0
OUTN1
OUTN2
OUTN3
OUTN4
1
2
3
4
5
6
7
8
OUTN5
9
OUTN6
10
OUTN7
11
N/C
12
OUTN8
13
OUTN9
14
OUTN10
21 SDO
20 OEN
24 23 22 21 20 19 18 17 16 15 14 13
AS1110
28-pin QFN 5x5
19 OUTN15
18 OUTN14
17 OUTN13
16 OUTN12
15 OUTN11
1
GND
2
SDI
3
CLK
4
LD
AS1110
24-pin SSOP
5
OUTN0
6
OUTN1
7
OUTN2
8
OUTN3
9
OUTN4
10 11 12
OUTN7
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
SSOP
1
2
3
4
5:20
QFN
24:27
28
1
2
3:10
12:19
20
Pin Name
GND
SDI
CLK
LD
OUTN0:15
Ground
Serial Data Input
Serial Data Clock.
The rising edge of the CLK signal is used to clock data into and out of the
AS1110 shift register. In error mode, the rising edge of the CLK signal is used to switch error
modes.
Serial Data Load
Output Current Drivers.
These pins are used as LED drivers or for input sense for
diagnostic modes. Data is transferred to the data register at the rising edge of these pins.
Output Enable.
The active-low pin OEN signal can always enable output drivers to sink
current independent of the AS1110 mode.
0 = Output drivers are enabled.
1 = Output drivers are disabled.
Serial Data Output.
In normal mode SDO is latched out 8.5 clock cycles after SDI is latched
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
Not connected
Description
21
OEN
22
21
SDO
23
24
-
22
23
11
REXT
V
DD
N/C
www.ams.com/LED-Driver-ICs/AS1110
Revision 1.6
OUTN8
28
27
26
25
24
23
REXT
22
REXT
SDO
OEN
V
DD
SDI
V
DD
2 - 24
AS1110
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
V
DD
to GND
Input Voltage
Output Voltage
GND Pin Current
Thermal Resistance
Θ
JA
Ambient Temperature
Storage Temperature
Humidity
Electrostatic Discharge
Digital Outputs
All Other Pins
-40
-55
5
2
2
-100 -
(I
NOM
x 0.5)
+100 +
I
NOM
Min
0
-0.4
-0.4
Max
7
V
DD
+0.4
15
2000
2800
88
23
+85
150
86
Units
V
V
V
mA
mA
ºC/W
ºC/W
ºC
ºC
%
kV
mA
Non-condensing
Norm: MIL 833 E method 3015
EIA/JESD78
The reflow peak soldering temperature (body temperature)
specified is in accordance with
IPC/JEDEC J-STD-020D
“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 of 168h
Represents an infinite floor lifetime
24-pin SSOP package
28-pin QFN (5x5mm) package
on PCB, 24-pin SSOP package
on PCB, 28-pin QFN (5x5mm) package
Comments
Latch-Up Immunity
Package Body Temperature
+260
ºC
Moisture Sensitivity
Level
SOIC
QFN
3
1
www.ams.com/LED-Driver-ICs/AS1110
Revision 1.6
3 - 24
AS1110
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, T
AMB
= -40°C to +85ºC (unless otherwise specified).
Table 3. Electrical Characteristics
Symbol
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
V
THH
T
OV1
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, OUTN0:15 = On
V
DS
within 1.0 and 3.0V
V
DD
within 3.0 and 5.0V
OEN
LD
V
DD
= 3.0V
V
DD
= 5.0V
250
250
0.25
1.2
2.0
0.4
98
±1
0.6
10
±0.1
±1
500
500
0.3
1.3
2.2
150
800
800
0.45
1.4
2.4
49.50
±1
V
DD
-
0.4V
24.5
±1
26
±3
51.55
±2
104
±2
0.8
20
High Level
CLK, OEN, LD, SDI
Output Current
Parameter
Supply Voltage
Output Voltage
OUTN0:15
OUTN0:15,
V
DD
= 5V
(see Figure 7)
SDO
SDO
Condition
Min
3.0
0
0.5
-1.0
1.0
0.7 x
V
DD
-0.3
V
DD
+
0.3
0.3 x
V
DD
0.5
0.4
V
Typ
Max
5.5
15.0
100
mA
Unit
V
V
V
µA
Device-to-Device Average Output Current
from OUTN0 to OUTN15
Current Skew
(Between Channels)
Device-to-Device Average Output Current
from OUTN0 to OUTN15
Current Skew
(Between Channels)
Device-to-Device Average Output Current
from OUTN0 to OUTN15
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
Error Detection Threshold Voltage
Error Detection Threshold Voltage
Overtemperature Threshold Flag
mA
%
mA
%
mA
%
mA
µA
%/V
%/V
kΩ
kΩ
V
V
ºC
www.ams.com/LED-Driver-ICs/AS1110
Revision 1.6
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