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Datas heet
AS1113
50mA, 16-Channel LED Driv e r w i t h D i a g n o s t i c s
1 General Description
The AS1113 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 out-
put current, and flexible serial interface makes the
device perfectly suited for high-volume transmission
applications.
Output current is adjustable (up to 50mA/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 AS1113 also features a low-current diagnostic
mode to minimize display flicker during fault testing.
2 Key Features
!
!
16 Constant-Current Output Channels
- Between Channels: <±3%
- Between Devices: <±6%
!
!
!
Output Current Per Channel: 0.5 to 50mA
Controlled In-Rush Current
Over-Temperature, Open-LED, Shorted-LED
Diagnostic Functions
Low-Current Test Mode
Global Fault Monitoring
The AS1113 is available in a 24-pin SSOP and the 28-
pin QFN (5x5mm) package.
If a higher output current is needed, please see the
AS1110 with 100mA drive capability.
Figure 1. Main Diagram and Pin Assignments
OUTN11
OUTN10
OUTN12
OUTN13
OUTN14
+V
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!
!
!
!
!
!
!
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 pan-
els, emergency light indicators, and traffic signs.
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SDI
AS1113
OUTN15
SDO
OUTN3
OUTN4
OUTN5
OUTN6
OUTN7
OUTN8
OUTN0
OUTN1
CLK
OUTN2
LD
OEN
REXT
OUTN9
GND
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Excellent Output Current Accuracy
AS1113
Datasheet
Contents
1 General Description ................................................................................................................................ 1
2 Key Features .......................................................................................................................................... 1
3 Applications ............................................................................................................................................ 1
4 Pinout ..................................................................................................................................................... 3
Pin Assignments ..................................................................................................................................................... 3
Pin Descriptions ..................................................................................................................................................... 3
5 Absolute Maximum Ratings .................................................................................................................... 4
Switching Characteristics ....................................................................................................................................... 6
8 Detailed Description ............................................................................................................................... 8
Serial Interface ....................................................................................................................................................... 9
Error-Detection Mode ........................................................................................................................................... 11
Global Error Mode ................................................................................................................................................ 11
Error Detection Functions ..................................................................................................................................... 12
Open-LED Detection ..................................................................................................................................... 12
Shorted-LED ................................................................................................................................................. 12
Overtemperature ........................................................................................................................................... 12
13
14
15
15
Detailed Error Reports .......................................................................................................................................... 13
Detailed Temperature Warning Report .........................................................................................................
Detailed Open-LED Error Report ..................................................................................................................
Detailed Shorted-LED Error Report ..............................................................................................................
Low-Current Diagnostic Mode .......................................................................................................................
Shutdown Mode .................................................................................................................................................... 16
9 Application Information ......................................................................................................................... 17
Error Detection ..................................................................................................................................................... 17
Error Detection On-The-Fly ........................................................................................................................... 17
Error Detection with Low-Current Diagnosis Mode ....................................................................................... 17
Cascading Devices ............................................................................................................................................... 18
Constant Current .................................................................................................................................................. 19
Adjusting Output Current ...................................................................................................................................... 19
Package Power Dissipation .................................................................................................................................. 19
Delayed Outputs ................................................................................................................................................... 19
Switching-Noise Reduction .................................................................................................................................. 19
Load Supply Voltage ............................................................................................................................................. 19
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10 Package Drawings and Markings ....................................................................................................... 21
11 Ordering Information ........................................................................................................................... 23
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Timing Diagrams .................................................................................................................................................... 9
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6 Electrical Characteristics ........................................................................................................................ 5
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AS1113
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
REXT
GND
GND
GND
GND
V
DD
SDI
REXT
28 27 26 25 24 23 22
CLK
LD
OUTN0
OUTN1
OUTN2
OUTN3
OUTN4
1
2
3
4
5
6
7
21 SDO
20 OEN
24 23 22 21 20 19 18 17 16 15 14 13
AS1113
28-pin QFN 5x5
19 OUTN15
18 OUTN14
17 OUTN13
16 OUTN12
15 OUTN11
1
2
3
4
5
6
AS1113
7
24-pin SSOP
Pin Descriptions
Pin Number
SSOP
1
2
3
4
Table 1. Pin Descriptions
5:20
21
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24
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OUTN0
OUTN1
OUTN2
OUTN3
OUTN4
OUTN5
OUTN6
GND
CLK
SDI
8
9
10 11 12 13 14
OUTN10
OUTN8
OUTN7
OUTN9
N/C
OUTN5
OUTN6
QFN
28
1
2
Pin Name
GND
SDI
Description
24:27
Ground
Serial Data Input
CLK
LD
Serial Data Clock.
The rising edge of the CLK signal is used to clock data
into and out of the AS1113 shift register. In error mode, the rising edge of the
CLK signal is used to switch error modes.
Serial Data Load
3:10
12:19
OUTN0:15
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 AS1113 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
20
OEN
21
SDO
22
REXT
V
DD
N/C
23
11
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LD
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OUTN15
OUTN14
OUTN13
OUTN12
OUTN10
OUTN11
OUTN9
OUTN8
SDO
OEN
V
DD
AS1113
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
Section 6 Electrical
Characteristics on page 5
is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 2. Absolute Maximum Ratings
V
DD
to GND
Input Voltage
Output Voltage
GND Pin Current
Thermal Resistance
Θ
JA
Ambient Temperature
Storage Temperature
Humidity
0
-0.4
-0.4
7
V
DD
+0.4
15
1000
88
23
V
V
V
mA
ºC/W
ºC/W
ºC
%
ºC
on PCB, 24-pin SSOP package
on PCB, 28-pin QFN (5x5mm) package
Electrostatic
Discharge
Package Body Temperature
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-40
5
+85
150
86
-55
Non-condensing
Digital Outputs
All Other Pins
2
2
kV
Latch-Up Immunity
+100 +
-100 -
(I
NOM
x 0.5) I
NOM
mA
EIA/JESD78
+260
ºC
Revision 1.04
Norm: MIL 833 E method 3015
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).
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Parameter
Min
Max
Units
Comments
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