BD6370GUL 查看數據表（PDF） - ROHM Semiconductor

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BD6370GUL

5ch System Lens Drivers for Digital Still Cameras

ROHM Semiconductor 

BD6370GUL, BD6758MWV, BD6758KN

Technical Note

1) Power-saving and Serial Reset (BD6370GUL; PS)

(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)

2) Motor Control Input (BD6370GUL; INPUTx)

(1) Function Explanation

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)

3) H-bridge (BD6370GUL; VM, OUTxA, OUTxB, and RNFx)

(1) Function Explanation

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.

(2) The D/A Converter Settings of Constant-Voltage, Constant-Current, and Full-ON Mode

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)

Output high voltage; VVOHx[V] = 8×VDACx[V]

VVOHx[V] = VM[V]

(8×VDACx≦VM[V], x = 12, 3, and V4)

(8×VDACx＞VM[V], x = 12, 3, and V4)

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D/A Converter setting value; 8×VDACx[V] = 1.5 to 4.725 (DACx = 6’b01_0100 to 6’b11_1111, x = 12, 3, and V4)

In the ch4, set DACI4 = 6’b11_1111.

(b) Constant-Current mode (ch4 and ch5)

Output current; Ioutx[A] = VDACx[V]÷(RMETALx[Ω]＋RRNFx[Ω])

(x = I4 and 5)

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D/A Converter setting value; VDACx[V] = 0.05 to 0.315 (DACx = 6’b00_1010 to 6’b11_1111, x = I4 and 5)

RMETALx; metal impedance of BD6370GUL’s inside (ch4; RMETALI4[Ω] = 0.004(Typ.), ch5; RMETAL5[Ω] = 0.022(Typ.))

RRNFx; Resistance to connect RNFx pin for output current detection

In the ch4, set DACV4 = 6’b11_1111.

(c) Full-ON mode (ch1 to ch4)

D/A Converter setting value; DACx = 6’b11_1111

(x = 12, 3, V4, and I4)

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2009.06 - Rev.A

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