AS1110_1 Datasheet, PDF (1/24 Pages) ams AG – Constant-Current, 16-Channel LED Driver with Diagnostics

AS1110
Datasheet
Constant-Current, 16-Channel 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 out-
put 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 (REXT).
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.
Figure 1. Main Diagram and Pin Assignments
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 pan-
els, emergency light indicators, and traffic signs.
+VLED
AS1110
SDI
CLK
LD
OEN
REXT
GND
SDO
VDD
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