點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

SP-VM148

Version

：001

Page

：13

Application Notes

The 11-VM148 is a constant current driving IC for applications in Auto-Focus. The

supply voltage range VDD of 11-VM148 is from 2.4V to 5.5V. The input range of

digital control pin PD, and digital I/O pins SCL and SDA, are defined such that

logic “High” is from 0.55*VDD to VDD+0.4V and logic “Low” is from –0.4V to

0.2*VDD. Therefore, the three digital pins are suitable controlled by 1.8V ISP.

The PD pin is the power off pin of 11-VM148. Logic low level (PD = Low) is for IC

operation. On the other hand, its logic high level (PD = High) puts the chip into

power off mode for power saving. It is recommended to keep PD at high level (PD

= H) before while the chip is no operation to save power, especially for

applications in portable devices.

is about 0.1~0.22uF and could be fine tuned for different VCM.