ST2226A SiTi, ST2226A Datasheet - Page 14

• Manufacturer Part Number: ST2226A
• Description: PWM-Controlled Constant Current Driver
• Manufacturer: SiTi

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Detailed Description
1) Time Division Operation
luminance data or MODE2 luminance data. After the luminance data is given, a
command should be issued so that the driver can operate in MODE1 or in MODE2.
Figure 4 shows the route of data shift-in in MODE2. Later we will explain the data
structure of MODE1 and MODE2 in more details.
is sent, LED1 PWM output will start 2 GCLK later. At the same time, the switch of
LED1 should be turned on. On the other hand, LED2 switch should be turned on when
LED2 PWM output starts. Again, “Disable” command must be sent before
“LED1/LED2 Emitting”. By periodically switching the emitting commands and LED
switches, we could drive 2 LEDs per channel.
DIN
ST2226A
Since ST2226A can drive 1 LED or 2 LEDs, the user can choose either MODE1
Figure 5. shows how to switch between 2 LEDs. When “LED1 Emitting” command
點晶科技股份有限公司
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
點晶科技股份有限公司
點晶科技股份有限公司
Ch0 LED1
Ch0 LED2
Figure 5. System Configuration for MODE 2 Operation
Figure 4. Block Diagram for Primary Bus.
One of Iout
Ch1 LED2
Ch1 LED1
Version ： ： ： ： A.010
Turn on
one of the
switches
ST2226A
System
LED1 Emitting
or
LED2 Emitting
Ch15 LED1
Ch15 LED2
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ST2226A
DOUT