bd6758mwv ROHM Co. Ltd., bd6758mwv Datasheet - Page 28

• Manufacturer Part Number: bd6758mwv
• Description: 5ch System Lens Drivers For Digital Still Cameras 
• Manufacturer: ROHM Co. Ltd.

4)
5)
Drive mode
Drive mode
Drive mode
Drive system of Linear Constant-Current H-bridge (BD6758MWV / KN: ch5)
I/O truth table (BD6758MWV / KN)
L: Low, H: High, X: Don’t care, Z: High impedance
At CW, current flows from OUTA to OUTB. At CCW, current flows from OUTB to OUTA.
L: Low, H: High, X: Don’t care, Z: High impedance
At CW, current flows from OUTA to OUTB. At CCW, current flows from OUTB to OUTA.
L: Low, H: High, X: Don’t care, Z: High impedance
At CW, current flows from OUTA to OUTB. At CCW, current flows from OUTB to OUTA.
EN/IN
EN/IN
EN/IN
IN/IN
IN/IN
BD6758MWV / KN (ch5) enable Linear Constant-Current Driving.
(1) Reference voltage output (with a tolerance of ±3%)
(2) Output current detection and current settings
If the VLIM pin is shorted to the VCC pin (or the same voltage level as the VCC is applied) and the SENSE and RNF pins are shorted
to the ground, this channel can be used as a Full-ON Drive H-bridge like the other four channels of BD6758KN.
The VREF pin outputs 1.2V, based on the internal reference voltage. The output current of the Constant-Current Drive block is
controllable by connecting external resistance to the VREF pin of the IC and applying a voltage divided by the resistor to the
output current setting pins (VLIM pin). It is recommended to set the external resistance to 2k or above in consideration of the
current capacity of the VREF pin, and 20k or below in order to minimize the fluctuation of the set value caused by the base
current of the internal transistor of the IC.
By connecting external resistor (0.1 to 5.0 ) to the RNF pin of the IC, the motor drive current will be converted into voltage in
order to be detected. The output current is kept constant by shorting the RNF and SENSE pins and comparing the voltage
with the VLIM voltage. To perform output current settings more precisely, trim the external RNF resistance if needed, and
supply a precise voltage externally to the VLIM pin of the IC. In that case, open the VREF pin.
The output current is 400mA 3% if 0.2V is applied to the VLIM pin and a 0.5 resistor is connected externally to the RNF pin.
BD6758MWV / KN Full-ON Driver ch1 and ch2 I/O Truth Table
BD6758MWV / KN Full-ON Driver ch3 and ch4 I/O Truth Table
BD6758MWV / KN Linear Constant-Current Driver ch5 I/O Truth Table
SEL2
Output current value Iout[A] =
SEL1
H
L
H
L
EN1
H
L
L
INxA
H
H
H
L
L
L
L
L
INPUT
INPUT
INPUT
INxA
H
H
H
L
L
L
L
INxB
H
H
H
X
X
L
L
L
IN5
H
X
L
INxB
BRKx
H
H
H
X
L
L
L
VLIM[V]
RNF[ ]
X
H
X
L
L
X
X
X
OUT5A
OUTxA
OUTxA
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H
H
H
Z
L
Z
L
L
Z
H
Z
H
Z
L
L
L
L
L
OUTPUT
OUTPUT
OUTPUT
OUT5B
OUTxB
OUTxB
H
Z
H
Z
H
H
H
Z
L
L
L
Z
L
L
Z
L
L
L
Standby
CW
CCW
Standby
CW
CCW
Brake
Standby
CW
CCW
Brake
Standby
CW
CCW
Brake
Standby
CW
CCW
Output mode
Output mode
Output mode
(5)