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PDF SCT2168 Data sheet ( Hoja de datos )
| Número de pieza | SCT2168 | |
| Descripción | 8-bit Serial-In/Parallel-Out Constant Current Driver | |
| Fabricantes | StarChips | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SCT2168 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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StarChips
Technology
SCT2168 V01_01; May/09
8-bit Serial-In/Parallel-Out Constant Current Driver
Product Description
The SCT2168 serial-interfaced LED driver sinks 8 LED clusters with constant current to
keep the uniform intensity of LED displays. In applications, an external resistor is used to
set the full-scale constant output current from 5mA up to 120mA. The SCT2168
guarantees each output can endure maximum 17V DC voltage stress. The built-in shift
registers and data latches making the SCT2168 effective solution in driving LED display.
The output enable function gates all 8 outputs on and off, and is fast enough to be used
as PWM input for LED intensity control. Since the serial data input rate can be reached
up to 25MHz, the SCT2168 will satisfy system which needs high volume data
transmission to control the LED display.
Features
8 constant current sinker with LED power-supply voltage up to 17V
Constant output current : 5 – 120mA@5V, 3 – [email protected]
Excellent current regulation to load, supply voltage and temperature
±1% Current matching between outputs
±3% Current matching between ICs
Fast output current control: Minimum PWM pulse width = 120ns
All output current are programmed together using a single external resistor
CMOS Schmitt trigger inputs with clock rate up to 25MHz
Operating supply voltage range of 3.3V to 5.5V
Built-in power on reset circuit forces all the outputs off while power on
Built-in thermal protection function to prevent damage from over current operation
Gradually 2ns delayed outputs to lower output switching noise
Package: SOP16, SSOP16,SOP16W
Applications: LED Displays, Variable Message Signs, LED Traffic Signs
Selector Guide
Part
SCT2110
SCT2167
SCT2168
SCT2210
SCT2026
SCT2024
Number of
Outputs
8
8
8
16
16
16
Max Output
Current (mA)
180
60
120
120
90
60
Min PWM Pulse
Width (ns)
100
180
120
50
120
180
Supply
Voltage (V)
5
3.3/5
3.3/5
5
5
3.3/5
StarChips Technology, Inc.
4F, No.5, Technology Rd., Science-Based Industrial Park, Hsin-Chu, Taiwan, R.O.C
TEL: +886-3-577-5767 # 555 FAX: +886-3-577-6575 E-mail: [email protected]
Page 1 of 15
1 page  
8-bit Serial-In/Parallel-Out Constant-Current LED Driver SCT2168
Recommended Operating Conditions (Ta=-40 to 85 °C unless otherwise noted)
Characteristic
Supply voltage
Output voltage
Output voltage
Output current
Input voltage
OE/ pulse width
Symbol
VDD
VOUT
VOUT
IOUT
VIH
VIL
tw
Condition
-
Output OFF
Output ON
VDD=3.3/5V
Input signals
Input signals
VDD=3.3/5V
Min.
3
-
1
5
0.7VDD
0
120
Typ.
-
-
-
-
-
-
-
Max.
5.5
17
4
60/90
VDD
0.3VDD
-
Unit
V
V
V
mA
V
V
ns
Electrical Characteristics (VDD=3.3/5V, Ta=25ºC unless otherwise noted)
Characteristic Symbol
Condition
Min. Typ Max. Unit
Input voltage
SDO Output
Voltage
Output leakage
current
VIH
-
0.7VDD -
VDD V
VIL - 0 - 0.3VDD V
VOH VDD=3.3/5V, IOH = -1mA 3.0/4.5 -
-V
VOL VDD=3.3/5V, IOL = +1mA
-
- 0.4 V
IOL VOUT = 17V - - 0.5 μA
Output current
Current bit skew
Output current
Current bit skew
IOUT
dIOUT
IOUT
dIOUT
VOUT=1.0V
IOUT=42mA
VOUT=1.0V
VOUT=1.0V
IOUT=20mA
VOUT=1.0V
REXT=900Ω
REXT=900Ω
REXT=1860Ω
REXT=1860Ω
-
-
-
-
42 - mA
±1 ±2 %
20 - mA
±1 ±2 %
IOUT vs. supply
voltage regulation
%/dVDD
3V <VDD < 5.5V
VOUT > 1.0 V, REXT=900Ω
-
- ±1 %/V
IOUT vs. output
voltage regulation
%/d VOUT
1V < VOUT < 4V
IOUT=42mA, REXT=900Ω
- ±0.1 ±0.5 %/V
Pull-up resistor
Rin(up)
OE/
- 500 - KΩ
Pull-down resistor
Thermal Shutdown
Rin(down)
TH
TL
LA/
Junction Temp.
- 500 - KΩ
- 160 - OC
- 110 - OC
IDD(off) 1
OFF
REXT =Open, VDD = 3.3/5V
OUT0~OUT7=Off
-
2
3
Supply
current
IDD(off) 2
REXT =900Ω, VDD = 3.3/5V
OUT0~OUT7=Off
-
5
7 mA
ON IDD(on)
REXT =900Ω,VDD = 3.3/5V
OUT0~OUT7=On
-
8 10
Page 5 of 15
5 Page 
8-bit Serial-In/Parallel-Out Constant-Current LED Driver SCT2168
Over Temperature Shutdown
The SCT2168 contains thermal shutdown scheme to prevent damage from over heat.
The internal thermal sensor turns off all outputs when the die temperature exceeds
approximately +160°C. The outputs are enabled again when the die temperature drops
below approximately +110°C.
Typical Application Circuits
Dynamic Lighting
SCAN
OUT0
OUT6
C.U.
SDI SDO
OLAE// SCT2168
CLK
REXT
VLED
POWER MOSFET ARRAY
which is not needed in Static
OUT1
OUT7
SDI
OE/
LA/
CLK
SDO
SCT2168
REXT
PCB Design Considerations
Use the following general guide-lines when designing printed circuit boards (PCB):
Decoupling Capacitor
Place a decoupling capacitor e.g. 0.1uF between VDD and GND pins of SCT2168.
Locate the capacitor as close to the SCT2168 as possible. This is normally adequate for
static LED driving. For dynamic scan or PWM applications, it is necessary to add an
additional capacitor of 4.7uF or more to each supply for every SCT2168. The necessary
capacitance depends on the LED load current, PWM switching frequency, and serial-in
data speed. Inadequate VDD decoupling can cause timing problems, and very noisy
LED supplies can affect LED current regulation.
Page 11 of 15
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SCT2168.PDF ] | |
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