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PDF AS1110 Data sheet ( Hoja de datos )
| Número de pieza | AS1110 | |
| Descripción | 16-Channel LED Driver | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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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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Revision 1.04
1 - 24
1 page  
AS1110
Datasheet - Electrical Characteristics
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6 Electrical Characteristics
VDD = +3.0 to +5.5V, TAMB = -40 to +85ºC (unless otherwise specified).
Table 3. Electrical Characteristics
Symbol
Parameter
Condition
Min Typ Max Unit
VDD Supply Voltage
3.0 5.5 V
VDS Output Voltage
OUTN0:15
0 15.0 V
IOUT
OUTN0:15, VDD = 5V (see Figure 7) 0.5
100
IOH Output Current
SDO
-1.0 mA
IOL
SDO
1.0
VIH
Input Voltage
VIL
High Level
Low Level
CLK, OEN, LD, SDI
0.7 x
VDD
-0.3
VDD +
0.3
0.3 x
VDD
V
IDS(OFF)
Output Leakage Current
OEN = 1, VDS = 15.0V
0.5 µA
VOL
Output
VOH Voltage
SDO
IOL = +1.0mA
IOH = -1.0mA
VDD -
0.4V
0.4
V
IAV(LC1)
Device-to-Device Average Output
Current from OUTN0 to OUTN15
VDS = 0.5V, VDD = Const.,
REXT = 744Ω
24.5
26 mA
ΔIAV(LC1)
Current Skew
(Between Channels)
VDS ≥ 0.5V, VDD = Const.,
REXT = 744Ω
±1 ±3 %
IAV(LC2)
Device-to-Device Average Output
Current from OUTN0 to OUTN15
VDS = 0.6V, VDD > 3.3V,
REXT = 372Ω
49.50
51.55 mA
ΔIAV(LC2)
Current Skew
(Between Channels)
VDS ≥ 0.6V, VDD = Const.,
REXT = 372Ω
±1 ±2 %
IAV(LC3)
Device-to-Device Average Output
Current from OUTN0 to OUTN15
VDS = 0.8V, VDD = 5.0V,
REXT = 186Ω
98
104 mA
ΔIAV(LC3)
Current Skew
(Between Channels)
VDS ≥ 0.8V, VDD = Const.,
REXT = 186Ω
±1 ±2 %
ILC Low-Current Diagnosis Mode
VDS = 0.8V, VDD = 5.0V
0.4 0.6 0.8 mA
IPD
Power Down Supply Current
VDS = 0.8V, VDD = 5.0V,
REXT = 372Ω, OUTN0:15 = On
10 20 µA
%/ΔVDS
Output Current vs.
Output Voltage Regulation
VDS within 1.0 and 3.0V
±0.1 %/V
%/ΔVDD
Output Current vs.
Supply Voltage Regulation
VDD within 3.0 and 5.0V
±1 %/V
RIN(UP)
Pullup Resistance
OEN
250 500 800 kΩ
RIN(DOWN)
Pulldown Resistance
LD 250 500 800 kΩ
VTHL Error Detection Threshold Voltage
0.25 0.3 0.45 V
VTHH Error Detection Threshold Voltage
VDD = 3.0V
VDD = 5.0V
1.2 1.3 1.4
2.0 2.2 2.4
V
TOV1
Overtemperature Threshold Flag
150 ºC
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Revision 1.04
5 - 24
5 Page 
AS1110
Datasheet - Detailed Description
Figure 13. Switching Global Error Mode Timing Diagram
OEN
LD
tTESTING
tGSW(ERROR)
tSU(ERROR)
tP(I/O)
CLK
tGSW(ERROR)
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tP(I/O)
tGSW(ERROR)
tP(I/O)
SDI
TFLAG(IN)
OFLAG(IN)
SFLAG(IN)
SDO
Acquisition of
Error Status
Don’t
Care
tP4
TFLAG
tSW(ERROR)
Don’t
Care
OFLAG
Don’t
Care
SFLAG
tSW(ERROR)
Error-Detection Mode
Acquisition of the error status occurs at the rising edge of OEN. Error-detection mode is started on the rising edge of
LD when OEN is high. The CLK signal must be low when entering error detection mode. Error detection for open- and
shorted-LEDs can only be performed for LEDs that are switched on during test time. To switch between error-detection
modes clock pulses are needed (see Table 5).
Note: To test all LEDs, a test pattern that turns on all LEDs must be input to the AS1110.
Global Error Mode
Global error mode is entered when error-detection mode is started. Clock pulses during this period are used to select
between temperature, open-LED, and shorted-LED tests, as well as low-current diagnostic mode and shutdown mode
(see Table 5). In global error mode, an error flag (TFLAG, OFLAG, SFLAG) is delivered to pin SDO if any errors are
encountered.
Table 5. Global Error Mode Selections
Clock
Pulses
Output Port
0 Don't Care
1 Enabled
2 Enabled
3 Don't Care
4 Don't Care
Error-Detection Mode
Over-Temperature
Detection
Open-LED Detection
Shorted-LED Detection
Low-Current Diagnostic
Mode
Shutdown Mode
Global Error Flag/Shutdown Condition
TFLAG = SDO = 1: No over-temperature warning.
TFLAG = SDO = 0: Over-temperature warning.
OFLAG = SDO = 1: No open-LED error.
OFLAG = SDO = 0: Open-LED error.
SFLAG = SDO = 1: No shorted-LED error.
SFLAG = SDO = 0: Shorted-LED error.
SDI = 1: Wakeup
SDI = 0: Shutdown
Note: For a valid result SDI must be 1 for the first device.
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Revision 1.04
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| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AS1110.PDF ] | |
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