AS1113_04 Datasheet, PDF (9/25 Pages) ams AG – 50mA, 16-Channel LED Driver with Diagnostics

AS1113
Datasheet - Detailed Description
8 Detailed Description
The AS1113 is designed to drive up to 16 LEDs through a fast serial interface and 16 constant-current output drivers.
Furthermore, the AS1113 provides diagnostics for detecting open- or shorted-LEDs, as well as over-temperature con-
ditions for LED display systems, especially LED traffic sign applications.
The AS1113 contains an 16-bit shift register and an 16-bit data register, which convert serial input data into parallel out-
put format. At AS1113 output stages, sixteen regulated current sinks are designed to provide uniform and constant cur-
rent with excellent matching between ports for driving LEDs within a wide range of forward voltage variations. External
output current is adjustable from 0.5 to 50mA using an external resistor for flexibility in controlling the brightness inten-
sity of LEDs. The AS1113 guarantees to endure 15V maximum at the outputs.
lid ^{The serial interface is capable of operating at a minimum of 30 MHz, satisfying the requirements of high-volume data}
transmission.
Using a multiplexed input/output technique, the AS1113 adds additional functionality to pins SDO, LD and OEN. These
a _{pins provide highly useful functions (open- and shorted-LED detection, over-temperature detection), thus reducing pin}
count. Over-temperature detection will work on-the-run, whereas the open- and shorted-LED detection can be used
v _{on-the-run or in low-current diagnostic mode (see page 15).}
ill ^{Figure 7. AS1113 - Block Diagram}
+VLED
s ^{AGent st} _REXT
am ^{nt OEN}
o LD
l ^c _CLK
nica ^SDI
Current
Generators
Temperature
Detection
16-Bit Open
Detection &
Error Register
16-Bit Short
Detection &
Error Register
AS1113
16-Bit Data
Register
16-Bit Shift
Register
Detailed
Error
Detection
Control Logic
Global
Error
Detection
SDO
Tech ^{Indicates 16 Bit Path}
www.austriamicrosystems.com/LED-Driver-ICs/AS1113
Revision 1.04
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