BU24035GW Datasheet, PDF (5/25 Pages) Rohm – u - step System Lens Driver for Digital Still Cameras

BU24035GW
Datasheet
●Description of Blocks
Voltage / Current Driver (5ch Driver)
Built-in voltage driver of PWM driving type / constant current driver.
Built-in digital FLL speed control logic for voltage driver.
(1) Control
(ⅰ)Register Control
■Voltage Driver (at speed control = OFF)
The PWM drive is executed by the PWM duty ratio, the PWM direction and the PWM ON/OFF which are controlled by
the register settings.
PWM duty
CSB
PWM
Host Direction
SCLK
ON/OFF ₃ SDATA
Control
H.B.
Logic
M
SIF
■Voltage Driver (at speed control = ON)
The speed control drive is executed by the target speed value, the direction, the coefficient value of PI filter and the
turning ON/OFF which are controlled by the register settings.
The motor speed is adjusted by comparing the target speed with the motor speed detected at the signal of
photo-interrupter.
Target speed
PI filter
Direction
ON/OFF 3
CSB
SCLK
SDATA
Host
SIF
DCM
Speed control
Logic
PWM
Control
Logic
H.B.
PI Dr
Comp
DCM
PI
■Current Driver
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
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/21
TSZ02201-0M2M0BC12080-1-2
18.Apr.2013 Rev.002