TA8435H/HQ TOSHIBA [Toshiba Semiconductor], TA8435H/HQ Datasheet - Page 23

• Manufacturer Part Number: TA8435H/HQ
• Description: PWM CHOPPER-TYPE BIPOLAR STEPPING MOTOR DRIVER.
• Manufacturer: TOSHIBA [Toshiba Semiconductor]

(2)
(3)
(4)
(5)
Setting M1 and M2 selects one of the following modes: 2-phase, 1-2-phase, W1-2-phase, and
2W1-2-phase modes.
To avoid step changing during motor rotation, the current must not fluctuate at phase mode switching.
Pay attention to the following points.
(a) During switching between 2-phase and other phase modes, the current fluctuates.
(b) When switching between phase modes other than 2-phase, the current can be switched without
Mode setting
Monitor ( MO ) output
Reset pin
Phase mode switching
The product supports the use of monitor output to monitor the current waveform location.
the B-phase current = -100%.
A-phase current = 100% and and that of the B-phase current = 0%.
The product supports the use of reset input to reset the internal counter.
Setting RESET to Low resets the internal counter, forcing the output current to the same value as
that when the MO output is Low.
<Example of Input Signal>
For 2-phase mode, the MO output is Low if the timing of the A-phase current = 100% and that of
For 1-2-phase, W1-2-phase, or 2W1-2-phase mode, the MO output is Low if the timing of the
fluctuation if the timing of MO output = Low.
However, when switching as follows, set RESET to Low beforehand:
from 1-2-phase to W1-2-phase or 2W1-2-phase mode;
from W1-2-phase to 2W1-2-phase mode.
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TA8435H/HQ
2006-3-2