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SCT2168 Datasheet Preview

SCT2168 Datasheet

8-bit Serial-In/Parallel-Out Constant Current Driver

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SCT2168 pdf
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 – 80mA@3.3V
‹ 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: service@starchips.com.tw
Page 1 of 15



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SCT2168 Datasheet Preview

SCT2168 Datasheet

8-bit Serial-In/Parallel-Out Constant Current Driver

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SCT2168 pdf
8-bit Serial-In/Parallel-Out Constant-Current LED Driver SCT2168
Block Diagram
OUT0 OUT1
OUT6 OUT7
REXT
Current
Regulator
Output Driver
OE/
LA/
SDI
CLK
Pin Configuration
Q
ST D
Q
ST D
DQ
C
DQ
C
Q
ST D
Q
ST D
DQ
C
DQ
C
SDO
Ordering information
GND
SDI
CLK
LA/
OUT0
OUT1
OUT2
OUT3
1 16
2 15
3 SCT2168 14
4 CSOG 13
5 CSSG 12
6 CSWG 11
7 10
89
VDD
REXT
SDO
OE/
OUT7
OUT6
OUT5
OUT4
Part Number
SCT2168CSOG
SCT2168CSSG
SCT2168CSWG
Package
Green SOP16
Green SSOP16
Green SOP16W
Terminal Description
Pin No.
1
2
3
4
5 ~ 12
13
14
15
16
Pin Name
GND
SDI
CLK
LA/
OUT0 ~ OUT7
OE/
SDO
REXT
VDD
Function
Ground terminal.
Serial input terminal of data shift register.
Clock input terminal of shift register, data is
sampled at the rising edge of CLK.
Data is latched when LA/ is low. Data on shift
register goes through when LA/ is high.
Output terminals with constant current.
Input terminal of output enable signal. Output is
enabled when OE/ is low.
Output terminal of serial-data output to the SDI
of next SCT2168.
Input terminal used to connect an external
resistor for setting up all output current.
Supply voltage terminal.
Page 2 of 15


Part Number SCT2168
Description 8-bit Serial-In/Parallel-Out Constant Current Driver
Maker StarChips
Total Page 15 Pages
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