bd6758mwv ROHM Co. Ltd., bd6758mwv Datasheet - Page 29

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

I/O Circuit Diagram
Operation Notes
PS, INPUT1, 2, 34, 45
STROBE, SCLK, SDATA
PS, INxA, INxB, EN1, IN5, SELx,
BRKx
1)
2)
3)
4)
5)
6)
7)
Absolute maximum ratings
Storage temperature range
Power supply pins and lines
Ground pins and lines
Thermal design
Pin short and wrong direction assembly of the device
Actions in strong magnetic field
Use of the IC in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in IC damage.
Assumptions should not be made regarding the state of the IC (short mode or open mode) when such damage is suffered. The implementation of a
physical safety measure such as a fuse should be considered when use of the IC in a special mode where the absolute maximum ratings may be
exceeded is anticipated.
As long as the IC is kept within this range, there should be no problems in the IC’s performance. Conversely, extreme temperature changes may result
in poor IC performance, even if the changes are within the above range.
None of the VM line for the H-bridges is internally connected to the VCC power supply line, which is only for the control logic or analog circuit. Therefore,
the VM and VCC lines can be driven at different voltages. Although these lines can be connected to a common power supply, do not open the power
supply pin but connect it to the power supply externally.
Regenerated current may flow as a result of the motor's back electromotive force. Insert capacitors between the power supply and ground pins to serve
as a route for regenerated current. Determine the capacitance in full consideration of all the characteristics of the electrolytic capacitor, because the
electrolytic capacitor may loose some capacitance at low temperatures. If the connected power supply does not have sufficient current absorption
capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may
exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode
between the power supply and ground pins.
For this IC with several power supplies and a part consists of the CMOS block, it is possible that rush current may flow instantaneously due to the
internal powering sequence and delays, and to the unstable internal logic, respectively. Therefore, give special consideration to power coupling
capacitance, width of power and ground wirings, and routing of wiring.
Ensure a minimum GND pin potential in all operating conditions. Make sure that no pins are at a voltage below the GND at any time, regardless of
whether it is a transient signal or not.
When using both small signal GND and large current MGND patterns, it is recommended to isolate the two ground patterns, placing a single ground
point at the application's reference point so that the pattern wiring resistance and voltage variations caused by large currents do not cause variations in
the small signal ground voltage. Be careful not to change the GND wiring pattern of any external components, either.
The power supply and ground lines must be as short and thick as possible to reduce line impedance.
Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions.
Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any connection error or if positive and
ground power supply terminals are reversed. The IC may also be damaged if pins are shorted together or are shorted to other circuit’s power lines.
Use caution when using the IC in the presence of a strong magnetic field as doing so may cause the IC to malfunction.
VCC
VCC
100k
200k
100k
10k
10k
VCC
VCC
8
8
9
,
9
Fig.52 BD6758MWV / KN I/O Circuit Diagram (Resistance values are typical ones)
Fig.51 BD6370GUL I/O Circuit Diagram (Resistance values are typical ones)
VM, GND,
OUT1A, 1B, 2A, 2B, 3A, 3B
VMx, OUTxA, OUTxB, PGNDx, RNF
20k
140k
VM
OUTxA
OUTxB
PGND
VMx
OUTxA
OUTxB
PGNDx
RNF
29/32
VM, RNF4, OUT4A, 4B
VREF
20k
VCC
200k
140k
4m
VCC
RNF4
VM
OUT4A
OUT4B
VLIM, SENSE
VM, RNF5, OUT5A, 5B
VCC
1k
22m
VM
OUT5A
OUT5B
RNF5