ST2226B
ST2226B is PWM-Controlled Constant Current Driver manufactured by SiTI.
Description
The ST2226B is a LED driver incorporating shift registers, data latches, 16-channel constant current circuitry with current value set by an external resistor, 1024 gray level PWM (Pulse Width Modulation) functional unit and time division capability. Each channel can provide a maximum current of 60 m A. Time division operation allows driving up to 1 or 2 LEDs with a single output channel (mode-1 and mode-2 respectively).
Block Diagram.
IOUT0
……
IOUT15
Rext Voltage Reference
Driver (16-Channel)
GCLK
PWM Counter parator (16-Channel)
CMD[2:0]
DCLK DIN
Operation Control
Shift Register and Latch (10 Bit ｘ 16-Channel ｘ 2LED)
DOUT
Figure 1. Functional block diagram
Version：A.002
Page：1
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Features
˙ Constant current outputs with current value settings by an external resistor ˙ Maximum output current: 60 m A ˙ Time division output allows the driving of 1 or 2 LEDs with a single output ˙ Maximum / minimum output voltage: 17V / 1.25V ˙ 10 bits luminance data with PWM current outputs ˙ Serial shift-in architecture for luminance data in time division Mode 1 and Mode 2
Absolute Maximum Ratings
Supply Voltage (AVDD, DVDD) Input Voltage Range (VIN) Driver Output Voltage Range (VOUT) Driver Output Current (IOUT) Power Dissipation (Ta = 50 ℃or less)
Thermal Resistance (Θja)
Operating temperature range (Top) Storage temperature range (Tstg)
-0.3 to 6
-0.3 to DVDD+0.3 -0.3 to 17 0 to 60
2.50, SDIP28 1.32, SOP28 40.0, SDIP28 75.9, SOP28
-40 to 85
-55 to 150
V V V m A W
℃ /W
℃ ℃
Version：A.002
Page：2
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Pin Connection (SDIP28 / SOP28 Top View)
Pin Assignment (SDIP28 /...
