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STSPIN820 Datasheet(PDF) 18 Page - STMicroelectronics

Part # STSPIN820
Description  Advanced 256 microsteps integrated motor driver with step-clock and direction interface
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STSPIN820 Datasheet(HTML) 18 Page - STMicroelectronics

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Functional description
STSPIN820
18/29
DocID031065 Rev 2
TOFF adjustment
The total OFF time is adjusted through an external resistor connected between the TOFF
pin and ground as shown in Figure 6.
Figure 6. OFF time regulation circuit
The relation between the total OFF time and the external resistor value is shown in the
graph of Figure 7. The value typically ranges from 10 µs to 150 µs. The recommended value
for ROFF is in the range between 5 k and 180 k.
Figure 7. OFF time vs ROFF value
The resulting OFF time depends on the decay mode selected:
DECAY = 'L', mixed decay
⇨ tOFF = tOFF,SLOW + tOFF,FAST
DECAY = 'H', slow decay
⇨ tOFF = tOFF,SLOW



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