bd6758mwv ROHM Co. Ltd., bd6758mwv Datasheet - Page 11

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

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Power-saving and Serial Reset (BD6370GUL; PS)
Motor Control Input (BD6370GUL; INPUTx)
H-bridge (BD6370GUL; VM, OUTxA, OUTxB, and RNFx)
(1) Function Explanation
(2) The D/A Converter Settings of Constant-Voltage, Constant-Current, and Full-ON Mode
(1) Function Explanation
(1) Function Explanation
When Low-level voltage is applied to PS pin, the IC will be turned off internally and the circuit current will be 0μA (Typ.). During
operating mode, PS pin should be High-level. (See the Electrical Characteristics; p.2/32)
Be cancelled power saving mode after turned on power supply VCC and VM, because of PS terminal combines power saving
with serial reset function. If the case of power saving terminal always shorted power supply terminal, reset function may not be
well, and it may cause the IC to malfunction. (See the Sequence of Serial Control Input; p.12/32)
These pins are used to program and control the motor drive modes. So INPUTx switches CW or CCW, CW or Brake, and
CCW or Brake, using serial function. (See the Electrical Characteristics; p.2/32 and I/O Truth Table; p.21/32 to p.23/32)
INPUT34 and INPUT45 pins drive ch3 or ch4, and ch4 or ch5, respectively. The driven channel is selected using serial
function. (See the Driven Outputs for INPUT Terminal Table; p.14/32)
The H-bridge output transistors of BD6370GUL are Power CMOS Drivers. The total H-bridge ON-Resistance on the high and
low sides varies with the VM voltage. The system must be designed so that the maximum H-bridge current for each channel is
500mA or below.
The 3 H-bridges of ch1 to ch3 can be driven as the resemblance 4-channels. For this reason, it is possible to drive the 2
Stepping Motors by ch1 to ch3 as long as the 2 motors don’t move simultaneously. The selection of resemblance drive mode
for ch1 to ch3 is set using serial function. (See the Driven Outputs for INPUT Terminal Table; p.14/32)
The 2 control input terminals of INPUT34 and INPUT45 drive the 3 H-bridges of ch3 to ch5. Use caution because it is
impossible to drive all 3 H-bridges simultaneously.
The ch1 to ch3 enable Constant-Voltage or Full-ON Driving, and the ch4 enables Constant-Voltage, Constant-Current, or
Full-ON Driving, while the ch5 is Constant-Current Driving.
In the case of Full-ON mode for ch1 to ch3, input serial data of each Constant-Voltage setting D/A Converter (DAC12 and
DAC3) to be full bits high.
In the ch4, as it set Constant-Voltage mode, input serial data of Constant-Current setting D/A Converter (DACI4) to be full bits
high. As it set Constant-Current mode, input serial data of Constant-Voltage setting D/A Converter (DACV4) to be full bits high,
while as it set Full-ON mode, input serial data of both D/A Converters to be full bits high. In the settings of Constant-Voltage or
Full-ON mode, no need to connect the external resistance for output current detection in RNF4 pin.
The selection of drive mode for ch1 to ch4 is set using serial function. (See the serial settings of the drive mode in each
channel; p.13/32 and p.15/32)
(a) Constant-Voltage mode (ch1 to ch4)
(b) Constant-Current mode (ch4 and ch5)
(c) Full-ON mode (ch1 to ch4)
Output high voltage; VVOHx[V] = 8 V
D/A Converter setting value; 8 V
In the ch4, set DACI4 = 6’b11_1111.
Output current; Ioutx[A] = V
D/A Converter setting value; V
In the ch4, set DACV4 = 6’b11_1111.
D/A Converter setting value; DACx = 6’b11_1111
R
R
METALx
RNFx
; Resistance to connect RNFx pin for output current detection
; metal impedance of BD6370GUL’s inside (ch4; R
VVOHx[V] = VM[V]
DACx
DACx
[V] (R
DACx
[V] = 0.05 to 0.315 (DACx = 6’b00_1010 to 6’b11_1111, x = I4 and 5)
[V] = 1.5 to 4.725 (DACx = 6’b01_0100 to 6’b11_1111, x = 12, 3, and V4)
METALx
DACx
[V]
11/32
[ ] R
(8 V
(8 V
RNFx
[ ])
DACx
DACx
VM[V], x = 12, 3, and V4)
VM[V], x = 12, 3, and V4)
METALI4
(x = I4 and 5)
(x = 12, 3, V4, and I4)
[ ] = 0.004(Typ.), ch5; R
METAL5
[ ] = 0.022(Typ.))
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(3)