bd63847 ROHM Co. Ltd., bd63847 Datasheet - Page 10

• Manufacturer Part Number: bd63847
• Description: Micro Step 36v Stepper Motor Drivers
• Manufacturer: ROHM Co. Ltd.

●Translator circuit
© 2010 ROHM Co., Ltd. All rights reserved.
BD63847/63843EFV
CW_CCW
www.rohm.com
This series builds in translator circuit and can drive stepper motor in CLK-IN mode.
The operation of the translator circuit in CLK-IN drive mode is described as below.
○Reset operation
○Control input timing
ENABLE
MODE0
MODE1
Please input as shown below because the translator circuit operates at the rising edge of CLK signal. If you disobey this
timing and input, then there is the possibility that the translator circuit does not operate as expected. In addition, at the
time of PS=L⇒H, it returns from the standby state to the normal state and there is a delay of 40µs (max.) until the motor
output has become the ACTIVE state, so within this delay interval there is no phase advance operation even if CLK is
inputted.
OUT1A
OUT1B
The translator circuit is initialized by power ON Reset function and PS terminal.
・Initializing operation when power supply is turned on
・Initializing operation during motor operating
CLK
CLK
PS
①If power supply is turned on at PS=L (Please use this sequence as a general rule)
②If power supply is turned on at PS=H
Please input the reset signal to PS terminal when the translator circuit is initialized during motor operating. (Refer to
P.12)
But at the time of PS=L⇒H, it returns from the standby state to the normal state and there is a delay of 40µs (max.)
until the motor output has become the ACTIVE state, so please be careful.
PS
When power supply is turned on, the power ON reset function operates in IC and initialized, but as long as it is PS=L,
the motor output is the OPEN state. After power supply is turned on, because of the changing of PS=L⇒H, the motor
output become the ACTIVE state, and the excitation is started at the initial electrical angle.
But at the time of PS=L⇒H, it returns from the standby state to the normal state and there is a delay of 40µs(max.)
until the motor output has become the ACTIVE state.
When power supply is turned on, the power ON function in IC operates, and initialized before the motor output
become the ACTIVE state, and the excitation is started at the initial electrical angle.
A: PS minimum input pulse width･･････20µs
B: PS rising edge~CLK rising edge input possible maximum delay time･･････40µs
C:CLK minimum period･･････4µs
D:CLK minimum input H pulse width･･････2µs
E:CLK minimum input L pulse width･･････2µs
F:MODE0,MODE1,CW_CCW, ENABLE set-up time･･････1µs
G:MODE0,MODE1,CW_CCW, ENABLE hold time･･････1µs
reset is released
A
motor output OPEN
delay
B
ACTIVE
F
10/19
G
①
D
C
motor output ON
E
②
Technical Note
2010.4 - Rev.A