3/19/2014 2 www.onsemi.com
SWIRE
Device Address & data
Digital Mode
Tw1
Shutdown
Tsel
Tdel
・・・
・・・
Toff
Shutdown
・・・
Tw0
Device Address & data
SWIRE
(PWM Freq > 6.6kHz)
・・・
PWM Enable
Ton
Toff
Shutdown
Tdel
・・・
Tsel
SWIRE
(PWM Freq < 6.6kHz)
・・・
PWM Enable
Toff
Shutdown
Tdel
・・・
Tsel
4. Start/Shutdown sequences
1. Please input "High" into SWIRE PIN during the period that is longer than Ton(20uSec) to start IC.
2. Then, please select a mode during mode select period(Tsel) .When you select Digital Mode, please input "Low" longer
than Tw1 after "High" longer than Tw0(100uSec) within Tsel(1mSec) period. It becomes PWM mode if you fail to set
Digital mode in specified timing period.
In the case of PWM frequency is less than 6.6kHz, it may become Digital Mode when you input a narrow pulse of
Duty.To evade it, input "High" that is longer than Tsel(2.2mSec), and, please input PWM pulse afterwards.
3. IC shut down when you make SWIRE PIN Low longer than Toff(8.9ms) period.
The Data register is stored at this point. The reset of the power supply is necessary to clear it. In addition, the mode is
initialized when you shut down IC.Please make mode select each time you reboot.
Digital Mode
PWM Mode
Start Up Shut down
