2 / 23 page
點晶科技股份有限公司
點晶科技股份有限公司
點晶科技股份有限公司
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
ST2226A
ST2226A
Version
:
:
:
:A.010
Page
:
:
:
:1
ST2226A
PWM-Controlled Constant Current Driver
for LED Displays
General Description
The ST2226A 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 mA. Time division operation allows driving up to 1
or 2 LEDs with a single output channel (mode-1 and mode-2 respectively).
Block Diagram
Figure 1. Functional block diagram
Operation
Control
PWM
Counter
Voltage
Reference
Driver
(16-Channel)
Comparator
(16-Channel)
Shift Register and Latch
(10 Bit x 16-Channel x 2LED)
Rext
GCLK
CMD[2:0]
DCLK
DIN
IOUT0
IOUT15
……
DOUT