引线
框架1616--bit bit Serial Serial--In/Parallel In/Parallel--Out Out Constant Constant Constant--Current LED Driver Current LED Driver
Product Description
The SCT2024 serial-interfaced LED driver sinks 16 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 45mA. The SCT2024 guarantees each output can endure maximum 17V DC voltage stress. The built-in shift registers and data latches making the SCT2024 effective solution in driving LED display. The output enable function gates all 16 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 SCT2024 will satisfy system which needs high volume data transmission to control the LED display. Furthermore, the SCT2024 provides excellent temperature regulation thus it can be applied to varied of operating temperature.
Features
16 robust constant current sinker with LED power-supply voltage up to 17V Constant output current : 5 – 30/45mA@3.3/5V Wide power supply voltages: 3.3V to 5V
Excellent regulation to load, supply voltage and temperature Temperature regulation: ±0.005%/°C, Load regulation: ±0.1%/V Line regulation: ±0.5%/V High current matching accuracy: ±1% between outputs, ±2% between ICs Fine grayscale response with 180ns PWM pulse width Dropout voltage 0.5V@20mA, V DD =5V
CMOS Schmitt trigger inputs with clock rate up to 25MHz @ cascade connection The constant current value of 16 outputs is set by a single external resistor
Interlaced 30ns delay of output, preventing instant current surge and output bouncing overstress Built-in power on reset(POR) circuit forces all the outputs off while power on Package: SSOP24, SSOP24-1, SOP24 and TQFN24
Applications: LED Displays, Variable Message Signs, Illumination, LED Traffic Signs
Pin Configurations
Terminal Description
Pin No. Pin Name A B C
Function
GND 1 7 22
(TP) Ground terminal(thermal pad included)
SDI 2 8 23 Serial input of data shift register.
CLK 3 9 24 Clock input of shift register, data
is sampled at the rising edge of CLK.
LA/
4
10
1
Input terminal of data strobe. Data is latched when LA/ is low. And data on shift register goes through when LA/ is high.
OUT[0:15] 5-20 11-2 2-17 Open-drain, constant-current outputs. OE/ 21 3 18
Output enable signal. Output is enabled when OE/ is forced to low. SDO 22 4 19 Output terminal of serial-data output to the SDI of next SCT2024. REXT 23 5 20 Used to connect an external resistor for setting up all output current VDD
24
6
Supply voltage terminal
VDD REXT SDO OE/ OUT15 OUT14 OUT13 OUT12 OUT11 OUT10 OUT9 OUT8 OUT13 OUT14OUT15OE/SDO REXT VDD GND SDI CLK LA/OUT0OUT1
OUT12 OUT11 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2
OUT14 OUT13 OUT12 OUT11
OUT5
OUT6 OUT7 OUT8 OUT9 OUT15 OE/ OUT10
Block Diagram
Equivalent Circuits of Inputs (1)
Equivalent Circuits of Inputs (2) Equivalent Circuits of Output
SDO
Selector Guide
Part Number of
Outputs
Max Output
Current (mA)
Min PWM Pulse
Supply
Voltage (V)
Error Detection
SCT2110 8 180 100 5 NA SCT2168 8 120 120 3.3/5 NA SCT2169 8 120 120 3.3/5 Yes SCT2167 8 60 180 3.3/5 NA SCT2210 16 120 50 5 NA SCT2026 16 90 120 3.3/5 NA SCT2027 16 90 120 3.3/5 Yes SCT2024 16 60 180 3.3/5 NA
Ordering Information
Part Marking Package Unit per reel(pcs) SCT2024CSSG SCT2024CSSG Green SSOP24 2500
固态高频
SCT2024CSTG SCT2024CSTG Green SSOP24-1 2000
SCT2024CSOG SCT2024CSOG Green SOP24 1000
SCT2024CSAG SCT2024CSAG Green SSOP24 2500
SCT2024CQNG 2024CQNG Green TQFN24 3000 StarChips Technology, Inc.
4F, No.5, Technology Rd., Science-Based Industrial Park, Hsin-Chu, Taiwan, R.O.C.
Tel : +886-3-577-5767 Ext.555,
Fax: +886-3-577-6575,
E-mail : service@starchips.tw
Truth Table
Timing Diagram
CLK
SDI LA/ OE/ OUT0 OUT1 OUT15 SDO
OFF ON OFF ON ON OFF (LSB) (MSB) OUT2 OUT3- OUT12 OUT13 OUT14 ON OFF ON
OFF ON OFF OFF ON
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