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PDF AS1109 Data sheet ( Hoja de datos )
| Número de pieza | AS1109 | |
| Descripción | 8-Bit LED Driver | |
| Fabricantes | ams | |
| Logotipo |  |
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AS1109
Constant-Current, 8-Bit LED Driver with Diagnostics
1 General Description
The AS1109 is designed to drive up to 8 LEDs through a fast serial
interface and features 8 output constant current drivers and an on-
chip diagnostic read-back function.
The high clock-frequency (up to 50MHz), adjustable output 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 AS1109 also features a low-current diagnostic mode to minimize
display flicker during fault testing.
With an operating temperature range from -40 to +125°C the
AS1109 is also ideal for industrial applications.
The AS1109 is available in a 16-pin SOIC-150, a 16-pin QFN
(4x4mm) and the 16-pin QSOP-150 package.
Figure 1. Main Diagram and Pin Assignments
2 Key Features
8 Constant-Current Output Channels
Excellent Output Current Accuracy
- Between Channels: ±2%
- Between AS1109 Devices: ±2%
Output Current Per Channel: 0.5 to 100mA
Controlled In-Rush Current
Over-Temperature, Open-LED, Shorted-LED
Diagnostics Functions
Low-Current Test Mode
Global Fault Monitoring
Low Shutdown Mode Current: 3µA
Fast Serial Interface: up to 50MHz
Cascaded Configuration
Fast Output Drivers Suitable for PWM
16-pin SOIC-150, 16-pin QFN (4x4mm) and 16-pin QSOP-150
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 panels, emergency light
indicators, and traffic signs.
+VLED
OUTN0 OUTN1 OUTN2 OUTN3 OUTN4 OUTN5 OUTN6 OUTN7
SDI AS1109 SDO
CLK LD
OEN
REXT
GND
VDD
GND 1
SDI 2
CLK 3
LD 4
OUTN0 5
OUTN1 6
OUTN2 7
OUTN3 8
AS1109
16 VDD
15 REXT
14 SDO
13 OEN
12 OUTN7
11 OUTN6
10 OUTN5
9 OUTN4
www.ams.com/LED-Driver-ICs/AS1109
Revision 1.21
1 - 24
1 page  
AS1109
Datasheet - Electrical Characteristics
Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
IDD(OFF)0
IDD(OFF)1
IDD(OFF)2
Off
IDD(OFF)3
IDD(ON)1
Supply Current
IDD(ON)2
On
IDD(ON)3
Condition
REXT = Open‚ OUTN0:7 = Off
REXT = 744Ω‚ OUTN0:7 = Off
REXT = 372Ω‚ OUTN0:7 = Off
REXT = 186Ω, OUTN0:7 = Off
REXT = 744Ω‚ OUTN0:7 = On
REXT = 372Ω‚ OUTN0:7 = On
REXT = 186Ω‚ OUTN0:7 = On
Min Typ Max Unit
1.3 2
3.0 3.68
4.7 5.37
8.1 8.73 mA
4.5 5
7.5 8
13.7 15
6.1 Switching Characteristics
VDD = 3.0 to 5.5V, VDS = 0.8V, VIH = VDD, VIL = GND, REXT = 372Ω, VLOAD = 4.0V, RLOAD = 64Ω, CLOAD = 10pF; guaranteed by design.
Table 4. Switching Characteristics
Symbol
tP1
tP2
tP3
tP4
tW(CLK)
tW(L)
tW(OE)
tR *
tF *
tOR
tOF
tSU(D)
tH(D)
tSU(L)
tH(L)
tTESTING
tSTAG
tSU(OE)
tGSW(ERROR)
tSU(ERROR)
tP(I/O)
tSW(ERROR)
fCLK
tP3,ON
tTP3,OFF
tREXT2,1
tREXT2,1
Parameter
Propagation Delay Time
Propagation Delay Time (Without Staggered
Output Delay)
Propagation Delay Time
Pulse Width
Maximum CLK Rise Time
Maximum CLK Fall Time
Output Rise Time of VOUT (Turn Off)
Output Fall Time of VOUT (Turn On)
Setup Time for SDI
Hold Time for SDI
Setup Time for LD
Hold Time for LD
Minimum OEN Time for Error Detection
Staggered Output Delay
Output Enable Setup Time
Global Error Switching Setup Time
Global Error Detection Setup Time
Propagation Delay Global Error Flag
Switching Time Global Error Flag
Maximum Clock Frequency
(Cascade Operation)
Low-Current Test Mode
Propagation Delay Time
External Resistor Reaction Time
External Resistor Reaction Time
Conditions
CLK - SDO
LD - OUTNn
OEN - OUTNn
CLK
LD
OEN (@IOUT < 60mA)
Min
15
15
200
5
5
5
5
2000
20
10
10
Turn ON
Turn OFF
Change from REXT1 = 372Ω, IOUT1
= 50.52mA to REXT2 = 37.2kΩ,
IOUT2 < 1mA
Change from REXT1 = 37.2kΩ,
IOUT1 = 0.5mA to REXT2 = 372Ω,
IOUT2 > 25mA
30
Typ
5
100
100
100
100
20
50
3
0.05
0.5
0.5
Max Unit
10
200 ns
200
10 ns
ns
500 ns
500 ns
200 ns
300 ns
ns
ns
ns
ns
ns
40 ns
ns
ns
ns
5 ns
10 ns
MHz
5 µs
0.1 µs
1 µs
1 µs
* If multiple AS1109 devices are cascaded and tr or tf is large, it may be critical to achieve the timing required for data transfer between two
cascaded LED drivers.
Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality
Control) methods.
www.ams.com/LED-Driver-ICs/AS1109
Revision 1.21
5 - 24
5 Page 
AS1109
Datasheet - Detailed Description
8.5 Error Detection Functions
8.5.1 Open-LED Detection
The AS1109 open-LED detection is based on the comparison between VDS and VTHL. The open LED status is aquired at the rising edge of
OEN and stored internally. While detecting open-LEDs the output port must be turned on. Open LED detection can be started with 1 clock pulse
during error detection mode while the output port is turned on.
Note: LEDs which are turned off at test time cannot be tested.
Table 6. Open LED Detection Modes
Output Port State
On
On
Effective Output
Point Conditions
VDS < VTHL
VDS > VTHL
Detected Open-LED
Error Status Code
0
1
Meaning
Open Circuit
Normal
8.5.2 Shorted-LED
The AS1109 shorted-LED detection is based on the comparison between VDS and VTHH. The shortened LED status is acquired at the rising
edge of OEN and stored internally. While detecting shorted-LEDs the output port must be turned on. Shorted-LED detection can be started with
2 clock pulses during error detection mode while the output port is turned on.
For valid results, the voltage at OUTN0:OUTN7 must be lower then VTHH under low-current diagnostic mode operating conditions. This can be
achieved by reducing the VLED voltage or by adding additional diodes, resistors or LED’s.
Note: LEDs which are turned off at test time cannot be tested.
Table 7. Shorted LED Detection Modes
Output Port State
On
On
Effective Output
Point Conditions
VDS > VTHH
VDS < VTHH
Detected Shorted-LED
Error Status Code
0
1
Meaning
Short Circuit
Normal
8.5.3 Overtemperature
Thermal protection for the AS1109 is provided by continuously monitoring the device’s core temperature. The overtemperature status is aquired
at the rising edge of OEN and stored internally.
Table 8. Overtemperature Modes
Output Port State
Don’t Care
Don’t Care
Effective Output
Point Conditions
Temperature > TOV1
Temperature < TOV1
Detected Overtemperature
Status Code
0
1
Meaning
Overtemperature Condition
Normal
www.ams.com/LED-Driver-ICs/AS1109
Revision 1.21
11 - 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AS1109.PDF ] | |
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