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BD63731EFV Datasheet(Fiches technique) 19 Page - Rohm
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BD63731EFV Datasheet(HTML) 19 Page - Rohm
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© 2019 ROHM Co., Ltd. All rights reserved.
• 15 • 001
Translator Circuit - continued
ENABLE Switch Timing Chart (FULL STEP A, MODE0=L, MODE1=L, MODE2=L)
The switch of the ENABLE signal is reflected by the change in the ENABLE signal with regardless of other input
The translator circuit stop and the electrical angle doesn't advance in the section of ENABLE=L. Because the output
for motor is OPEN and CLK input is blocked. When ENABLE=L to H, the output state returns immediately to the last
state before the input of ENABLE=L. Excitation mode (MODE0, MODE1, MODE2) also switches within ENABLE=L
interval. Where excitation mode switched within ENABLE=L interval, restoring of ENABLE=L to H was done in the
excitation mode after switch.
About the Switch of the Motor Excitation Mode
The switch of the excitation mode can be done with regardless of the CLK signal at the same time as changing of the
signal MODE0, MODE1 and MODE2. The following built-in function can prevent motor out-of-step caused by
discrepancies of torque vector of transitional excitations during switch between excitation modes. This function is
limited to fixed MODE2 signal only. Depending on the state of operation of the motor at the switch the motor cannot
follow even if the control on driver IC side is correspondent and there are possibilities of step-out and mistake step in
motor. Therefore, switch sequence shall be evaluated sufficiently before any decision.
Cautions of Bidirectional Switch of CW_CCW and Excitation Modes (MODE0, MODE1, MODE2)
As shown in the figure below, the area between the end of reset discharge (PS=L to H) and beginning of the first CLK
signal input is defined as interval A, while the area until the end of the first CLK signal input is defined as interval B.
=> For CW_CCW, no limitation is applied on switch of excitation mode.
=> In CLK1 period, or within ENABLE=L interval
, CW_CCW and excitation mode can’t be switched together.
Violation of this restriction may lead to false step (with one extra leading phase) or out-of-step.
Therefore, in case that CW_CCW and excitation modes are switched simultaneously, the PS pin must be input
with reset signal. Then start to operate in interval A before carrying out such bidirectional switch.
Restoring in the state prior to input of ENABLE=L
Output off & Translator stop
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