BU24032GW Datasheet, PDF (6/23 Pages) Rohm – u - step System Lens Driver for Digital Still Cameras

BU24032GW
Datasheet
●Description of Blocks
Current Driver (6ch 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)Register 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
Host ^{ON/OFF 3}
SDATA
SIF
Control
Logic
Current control
DAC
C.C.
VCM
(ⅱ)External Pin Control
The constant current drive is executed by the output current value and current direction which are controlled by the
register setting. Constant current driving ON/OFF is controlled by IN6 pin.
Current value
CSB
Direction
SCLK
3
SDATA
SIF
Host
ON/OFF
IN6
Control
Logic
Current control
DAC
C.C.
VCM
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TSZ22111・15・001
6/19
TSZ02201-0M2M0BC12060-1-2
18.Apr.2013 Rev.002