BU24038GW_13 Datasheet, PDF (6/26 Pages) Rohm – u- step System Lens Driver for Digital Still Cameras

BU24038GW
Datasheet
●Description of Blocks
Voltage Driver (7ch, 8ch Driver)
Built-in voltage driver of PWM driving type.
(1) Control
(ⅰ)Register Control
■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
Direction
SCLK
PWM
Host _{ON/OFF 3 SDATA}
Control
H.B.
Logic
M
SIF
■8ch 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
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TSZ22111・15・001
6/22
TSZ02201-0M2M0BC12090-1-2
18.Apr.2013 Rev.002