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AS1109 PDF 데이터시트 ( Data , Function )

부품번호 AS1109 기능
기능 8-Bit LED Driver
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AS1109 데이터시트, 핀배열, 회로
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
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AS1109 pdf, 반도체, 판매, 대치품
AS1109
Datasheet - Electrical Characteristics
6 Electrical Characteristics
VDD = +3.0V to +5.5V, Typical values measured at VDD = 5V, TAMB = 25°C (unless otherwise specified).
Table 3. Electrical Characteristics
Symbol
Parameter
TAMB
Operating Temperature Range
VDD Supply Voltage
VDS Output Voltage
IOUT
IOH Output Current
IOL
VIH
Input Voltage
VIL
High Level
Low Level
IDS(OFF)
VOL
VOH
Output Leakage Current
Output
Voltage
SDO
IAV(LC1)
ΔIAV(LC1)
IAV(LC2)
ΔIAV(LC2)
IAV(LC3)
ΔIAV(LC3)
ILC
Device-to-Device Average Output Current
from OUTN0 to OUTN7
Current Skew
(Between Channels)
Device-to-Device Average Output Current
from OUTN0 to OUTN7
Current Skew
(Between Channels)
Device-to-Device Average Output Current
from OUTN0 to OUTN7
Current Skew
(Between Channels)
Low-Current Diagnosis Mode
IPD Power Down Supply Current
%/ΔVDS
%/ΔVDD
RIN(UP)
RIN(DOWN)
VTHL*
Output Current vs.
Output Voltage Regulation
Output Current vs.
Supply Voltage Regulation
Pullup Resistance
Pulldown Resistance
Open Error Detection Threshold Voltage
VTHH*
Short Error Detection Threshold Voltage
TOV1
Overtemperature Threshold Flag
Condition
Device fully functional up to 125°C
OUTN0:7
OUTN0:7, VDD = 5V (see Figure 8)
SDO
SDO
CLK, OEN, LD, SDI
OEN = 1, VDS = 15.0V
IOL = +1.0mA
IOH = -1.0mA
VDS = 0.5V, VDD = Const.,
REXT = 744Ω
VDS 0.5V, VDD = Const.,
REXT = 744Ω
VDS = 0.6V, VDD > 3.3V,
REXT = 372Ω
VDS 0.6V, VDD = Const.,
REXT = 372Ω
VDS = 0.8V, VDD = 5.0V,
REXT = 186Ω
VDS 0.8V, VDD = Const.,
REXT = 186Ω
VDS = 0.8V, VDD = 5.0V
VDS = 0.8V, VDD = 5.0V,
REXT = 372Ω, OUTN0:7 = On
VDS within 1.0 and 3.0V
VDD within 3.0 and 5.0V
OEN
LD
No load
VDD = 3.0V, no load
VDD = 5.0V, no load
Min Typ Max Unit
-40 +85 °C
3.0 5.5 V
0 15.0 V
0.5 100
-1.0 mA
1.0
0.7 x VDD +
VDD
0.3
V
-0.3
0.3 x
VDD
0.5 µA
VDD -
0.4V
0.4
V
24.5 25.26 26 mA
±0.9 ±3 %
49.50 50.52 51.55 mA
±0.8 ±2 %
98 101 104 mA
±0.5 ±2 %
0.4 0.6 0.8 mA
3 20 µA
±0.1 %/V
±1 %/V
250 500 800 kΩ
250 500 800 kΩ
0.25 0.35 0.45 V
1.2 1.3 1.4
V
2.0 2.2 2.4
150 ºC
www.ams.com/LED-Driver-ICs/AS1109
Revision 1.21
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AS1109 전자부품, 판매, 대치품
AS1109
Datasheet - Detailed Description
8 Detailed Description
The AS1109 is designed to drive up to 8 LEDs through a fast serial interface and 8 constant-current output drivers. Furthermore, the AS1109
provides diagnostics for detecting open- or shorted-LEDs, as well as over-temperature conditions for LED display systems, especially LED traffic
sign applications.
The AS1109 contains an 8-bit shift register and an 8-bit data register, which convert serial input data into parallel output format. At AS1109 output
stages, eight regulated current sinks are designed to provide uniform and constant current 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 AS1109 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 AS1109 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 (see page 14).
Figure 9. AS1109 - Block Diagram
+VLED
OUTN0
OUTN1
OUTN2
OUTN3
OUTN4
OUTN5
OUTN6
OUTN7
REXT
OEN
LD
CLK
SDI
Current
Generators
8-Bit Data
Register
8-Bit Shift
Register
Temperature
Detection
8-Bit Open Detec-
tion & Error Reg-
ister
8-Bit Short
Detection & Error
Register
AS1109
Detailed
Error
Detection
Control Logic
Global Error
Detection
SDO
Indicates 8 Bit Path
8.1 Serial Interface
Data accesses are made serially via pins SDI and SDO. At each CLK rising edge, the signal present at pin SDI is shifted into the first bit of the
internal shift register and the other bits are shifted ahead of the first bit. The MSB is the first bit to be clocked in. In error-detection mode the shift
register will latch-in the corresponding error data of temperature-, open-, and short-error register with each falling edge of LD.
www.ams.com/LED-Driver-ICs/AS1109
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