BU24033GW_16 Datasheet, PDF (5/25 Pages) Rohm – u - step System Lens Driver for Digital Still Cameras

BU24033GW
●Description of Blocks
Voltage Driver (5ch Driver)
Built-in voltage driver of PWM driving type.
Built-in digital FLL speed control logic.
(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
■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
CSB
SCLK
ON/OFF ₃ ^SDATA
Host
SIF
DCM
Speed control
Logic
PWM
Control
Logic
H.B.
PI Dr
Comp
DCM
PI
(ⅱ)External Pin Control (only at speed control = OFF)
■at speed control = OFF
The PWM drive is executed by the PWM duty ratio which is controlled by the register setting. The PWM direction and
the PWM ON/OFF are controlled by IN5A/IN5B pin.
CSB
SCLK
PWM duty ₃ SDATA
PWM
Host _Direction
IN5A
SIF
Control
Logic
H.B.
M
ON/OFF _{2 IN5B}
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TSZ22111・15・001
5/21
TSZ02201-0M3M0BC16060-1-2
20.May.2016 Rev.003