BD68610EFV Datasheet, PDF (5/23 Pages) Rohm – 36V Stepping Motor Driver

BD68610EFV
●Function explanation
○PS／Power save terminal
PS can make circuit standby state and make motor output OPEN. When PS=L⇒H, please be careful because there is a
delay of 40μs(max.) before it is returned from standby state to normal state and the motor output becomes ACTIVE.
PS
Status
L
Standby state
H
ACTIVE
○PHASE1,PHASE2／Phase selection terminal
These terminals determine output state.
PHASE1
PHASE2
OUT1A
L
L
L
H
L
H
L
H
L
H
H
H
OUT1B
H
L
H
L
OUT2A
L
L
H
H
OUT2B
H
H
L
L
○I01,I02,I11,I12／VREF division ratio setting terminal
These terminals determine internal 2bit-DAC output voltage for current limit.
I0x
I1x
Output current level(%)
L
L
100
H
L
67
L
H
33
H
H
0
(I0X, I1X)=(H, H): motor outputs are open.
○VCC1,VCC2／Power supply terminal
Motor’s drive current is flowing in it, so please wire in such a way that the wire is thick & short and has low impedance.
Voltage VCC may have great fluctuation, so please arrange the bypass capacitor of about 100μ～470μF as close to the
terminal as possible and adjust in such a way that the voltage VCC is stable. Please increase the capacity if needed
especially when a large current is used or those motors that have great back electromotive force are used.
In addition, for the purpose of reducing of power supply’s impedance in wide frequency bandwidth, parallel connection of
multi-layered ceramic capacitor of 0.01μ～0.1μF etc is recommended. Extreme care must be used to make sure that the
voltage VCC does not exceed the rating even for a moment.
VCC1 & VCC2 are shorted inside IC, so please be sure to short externally VCC1 & VCC2 when using. If used without
shorting, malfunction or destruction may occur because of concentration of current routes etc., so please make sure that
they are shorted when in use. Still more, in the power supply terminal, there is built-in clamp component for preventing of
electrostatic destruction. If steep pulse or voltage of surge more that maximum absolute rating is applied, this clamp
component operates, as a result there is the danger of destruction, so please be sure that the maximum absolute rating
must not be exceeded. It is effective to mount a Zener diode of about the maximum absolute rating. Moreover, the diode for
preventing of electrostatic destruction is inserted between VCC terminal and GND terminal, as a result there is the danger
of IC destruction if reverse voltage is applied between VCC terminal and GND terminal, so please be careful.
○GND／Ground terminal
In order to reduce the noise caused by switching current and to stabilize the internal reference voltage of IC, please wire in
such a way that the wiring impedance from this terminal is made as low as possible to achieve the lowest electrical potential
no matter what operating state it may be. Moreover, please design patterns not to have any common impedance with other
GND patterns.
○OUT1A,OUT1B,OUT2A,OUT2B／H Bridge output terminal
Motor’s drive current is flowing in it, so please wire in such a way that the wire is thick & short and has low impedance. It is
also effective to add a Schottky diode if output has positive or negative great fluctuation when large current is used etc, for
example, if counter electromotive voltage etc. is great. Moreover, in the output terminal, there is built-in clamp component
for preventing of electrostatic destruction. If steep pulse or voltage of surge more than maximum absolute rating is applied,
this clamp component operates, as a result there is the danger of even destruction, so please be sure that the maximum
absolute rating must not be exceeded.
○RNF1,RNF2／Connection terminal of resistor for detecting of output current
Please connect the resistor of 0.1Ω～0.3Ω for current detection between this terminal and GND In view of the power
consumption of the current-detecting resistor, please determine the resistor in such a way that W=IOUT2ï½¥R[W] does not
exceed the power dissipation of the resistor. In addition, please wire in such a way that it has a low impedance and does
not have a impedance in common with other GND patterns because motor’s drive current flows in the pattern through RNF
terminal～current-detecting resistor～GND. Please do not exceed the rating because there is the possibility of circuits’
malfunction etc. if RNF voltage has exceeded the maximum rating (0.7V). Moreover, please be careful because if RNF
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/19
TSZ02201-0P2P0B700550-1-2
11.Mar.2014 Rev.001