BD64550EFV 查看數據表（PDF） - ROHM Semiconductor

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BD64550EFV

System Driver for Ink Jet Printers

ROHM Semiconductor 

BD64550EFV

Technical Note

●Pin selection function

Either serial control or external PWM control can be selected for motor control type with SELECT pin (pin 22).

SELECT

Output state

L

Serial input mode

H

External PWM control mode

STROBE/DC1E(25pin)

SDATA(26pin)

SCLK/DC1P(27pin)

DC2P(24pin)

DC2E(23pin)

SELECT(22pin)

ENA PHA

Internal shift register

SEL

SEL

Serial

SEL

Serial

SEL

Serial

Fig.14 Serial Input Block Diagram

The input/output logic at SELECT = H is as follows.

DC1E/DC2E

L

H

Output state

Open

ACTIVE

DC1P/DC2P

L

H

OUTP

SINK

SOURCE

OUTM

SOURCE

SINK

Control

Logic

OUTPUT

○Procedure of DC motor drive by external PWM control

1) Serial setting

Set the serial by SELECT pin = L. (WORD_S and WORD_D setting)

・WORD_S (see P.7) is a drive parameter for setting OFF_TIME, BLANK TIME etc.

・WORD_D (see P.7) is for drive setting to set drive mode of each H-bridge.

When setting WORD_D (see P.7), make sure that ENABLE signal (ENABLE_1､ENABLE_2) of serial bit is L.

If ENABLE signal is H, the motor may operate.

Input of DC2P pin can be either H or L.

2) External PWM drive mode switch

Set external PWM drive mode by SELECT pin = H.

Switch by DC1E (STROBE)/CD2E pin = L when switching SELECT pin.

3) Drive

PHASE, ENABLE pin input signal (DC1E/DC1P/DC2E/DC2P) drives in external PWM mode.

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5/16

2010.06 - Rev.A

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