BU24038GW_13 Datasheet, PDF (7/26 Pages) Rohm – u- step System Lens Driver for Digital Still Cameras

BU24038GW
Datasheet
●Description of Blocks
Current Driver (9ch Driver)
Built-in constant current driver.
The voltage of RNF pin and the external resistor (RRNF) determine the amount of output current. The internal
high-precision amplifier (CMOS gate input) is used for the constant current control. If any resistance component exists
in the wirings of RNF pin and the external resistor (RRNF), the precision can be reduced. To avoid this, pay utmost
attention to the wirings.
(1) Control
(ⅰ)Resistor Control
The constant current drive is executed by the output current value, the current direction and the current ON/OFF which
are controlled by the register settings.
Current value _CSB
Direction
SCLK
ON/OFF ₃ SDATA
Host
SIF
Control
Logic
Current control
DAC
C.C.
VCM
(ⅱ) External Pin Control1
The constant current drive is executed by the output current value which is controlled by the register setting. Constant
current direction and turning ON/OFF are controlled by IN pin.
CSB
Current value ^SCLK
3 ^SDATA
SIF
Host _Direction
ON/OFF ²
IN
Control
Logic
Current control
DAC
C.C.
VCM
(ⅲ) External Pin Control2
The constant current drive is executed by the output current value and the current direction which are controlled by the
register setting. Constant current driving ON/OFF is controlled by IN pin.
CSB
Current value ^SCLK
Direction 3 ^SDATA
SIF
Host
ON/OFF
IN
Control
Logic
Current control
DAC
C.C.
VCM
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TSZ02201-0M2M0BC12090-1-2
18.Apr.2013 Rev.002