AS1110
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1110 is designed to drive up to 16 LEDs through a fast serial interface and 16 constant-current output drivers.
Furthermore, the AS1110 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 AS1110 contains an 16-bit shift register and an 16-bit data register, which convert serial input data into parallel out-
put format. At AS1110 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 100mA using an external resistor for flexibility in controlling the brightness
intensity of LEDs. The AS1110 guarantees to endure 15V maximum at the outputs.
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 AS1110 adds additional functionality to pins SDO, LD and OEN. These
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
on-the-run or in low-current diagnostic mode
Figure 8. Block Diagram
+V
LED
OUTN10
OUTN12
OUTN13
OUTN14
OUTN15
Global
Error
Detection
OUTN11
OUTN0
OUTN1
OUTN2
OUTN3
OUTN4
OUTN5
OUTN6
OUTN7
OUTN8
OUTN9
REXT
Current
Generators
OEN
LD
Temperature
Detection
16-Bit Open
Detection &
Error Register
16-Bit Short
Detection &
Error Register
AS1110
16-Bit Data
Register
Detailed
Error
Detection
CLK
SDI
16-Bit Shift
Register
Control Logic
SDO
Indicates 16 Bit Path
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