BU24020GU_13 Datasheet, PDF (4/21 Pages) Rohm – u - step System Lens Driver for Digital Still Cameras

BU24020GU
Datasheet
●Description of Blocks
Stepping Motor Driver (1ch-4ch Driver)
Built-in stepping motor driver of PWM driving type.
Maximum 2 stepping motors can be driven independently.
Built-in voltage feedback circuit of D-class type.
3ch/4ch drivers can also drive independently for DC motor or voice coil motor.
(1) Control
It corresponds to both Clock IN and Autonomous control.
(ⅰ)Clock IN Control
Set the resistors for the stepping motor control.
The stepping motor is rotated and synchronized with the input clock in the STATE pin.
It is possible to select the mode of stepping motor control from μ-step, 1-2 phase excitation, 2 phase excitation and
the number of edge for electrical angle cycle from 4, 8, 32, 64, 128, 256, 512 or 1024.
ON/OFF
Direction
Torque 3
CSB
SCLK
SDATA
SIF
Host
(Speedï½¥Amount)
STATE
STM
Control
Logic
SIN wave
Control
Logic
PWM
Control
Logic
H.B.
H.B.
STM
(ⅱ)Autonomous Control
The stepping motor is rotated by setting the resistors for the stepping motor control.
The state of rotation command (executing:1, finished:0), Cache resistor and motor position are the output from the
serial output (SOUT pin). Also, the signal (MO output) which is synchronized with the motor rotation is the output from
STATE pin.
It is possible to select the mode of stepping motor control from μ-step (1024 portion), 1-2 phase excitation and
2 phase excitation.
Built-in Cache resistors.
Cache resistors enable the setting of subsequent process while the motor is in operation. Through these registers,
operations are done continuously.
ON/OFF
Direction
Speed
CSB
Torque
SCLK
Amount 3 SDATA
SIF
Host _State
SOUT
Position
STATE
STM
Control
Logic
SIN wave
Control
Logic
PWM
Control
Logic
H.B.
H.B.
STM
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TSZ22111・15・001
4/17
TSZ02201-0M2M0BC12020-1-2
18.Apr.2013 Rev.002