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STSPIN220 数据表(PDF) 13 Page - STMicroelectronics

部件名 STSPIN220
功能描述  Low voltage stepper motor driver
PDF  27 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STSPIN220 数据表(HTML) 13 Page - STMicroelectronics

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Table 12. ON, slow decay and fast decay states
Current direction(1)
ON
Slow decay
Fast decay (quasi-synch)
Zero (power bridge disabled)
HSX1 = OFF
LSX1 = OFF
HSX2 = OFF
LSX2 = OFF
HSX1 = OFF
LSX1 = OFF
HSX2 = OFF
LSX2 = OFF
HSX1 = OFF
LSX1 = OFF
HSX2 = OFF
LSX2 = OFF
X1 → X2
HSX1 = ON
LSX1 = OFF
HSX2 = OFF
LSX2 = ON
HSX1 = OFF
LSX1 = ON
HSX2 = OFF
LSX2 = ON
HSX1 = OFF
LSX1 = ON
HSX2 = OFF
LSX2 = OFF
X1 ← X2
HSX1 = OFF
LSX1 = ON
HSX2 = ON
LSX2 = OFF
HSX1 = OFF
LSX1 = ON
HSX2 = OFF
LSX2 = ON
HSX1 = OFF
LSX1 = OFF
HSX2 = OFF
LSX2 = ON
1. The current direction is set according toTable 9. Table 9 and Table 9. Target reference and current direction according to
sequencer value (full-step mode)Table 10. Target reference and current direction according to sequencer value (not full-step
mode) .
The reference voltage value, VREF, must be selected according to the load current target value (peak value) and
sense resistor value.
Equation 1
In choosing the sense resistor value, two main issues must be taken into account:
•
The sense resistor dissipates energy and provides dangerous negative voltages on the SENSE pins during
current recirculation. For this reason the resistance of this component should be kept low (using multiple
resistors in parallel will help to obtain the required power rating with standard resistors).
•
The lower the RSNSx value, the higher the peak current error due to noise on the VREF pin and the input
offset of the current sense comparator. Values of RSNSx that are too low must be avoided.
STSPIN220
PWM current control
DS11633 - Rev 4
page 13/27



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