點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Application Circuit
CL= 0.1 F
VCM
VDD
1 F
0.1 F
IL
Rp
Rp
10
1
11-MD218B
VDD
SINK
SDA
SCL
7
8
Output
Driver
I2C Interface
10-BIT DAC
PD
VSS
AGND
I2C MASTER
DEVICE
I2C SLAVE
DEVICE
2
4
9
PD = H (IC work)
PD = L (IC ShutDown)
Application Notes
z
The 11-MD218A is a constant current control IC for application in Auto-Focus.
The supply voltage range VDD of 11-MD218A 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 “H” is from 0.55*VDD to VDD+0.4V and logic “L” is from –0.4V to
0.2*VDD. Therefore, the three digital pins are suitable controlled by 1.8V ISP.
z
The PD pin is the power down pin of 11-MD218A. Logic low level (PD = H) is for
IC operation. On the other hand, its logic high level (PD = L) puts the chip into
power down mode for power saving. It is recommended to keep PD at high level
(PD = L) before operation to reach the maximum efficiency of power saving,
especially for applications in portable devices.
SP-MD218A-A.001.doc
Version：A.001
Page：12
SITI [ SILICON TOUCH TECHNOLOGY INC. ]
