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AN2650 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN2650
Description  L9942 stepper motor driver for bipolar stepper motors
PDF  26 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2650 Datasheet(HTML) 5 Page - STMicroelectronics

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DocID14109 Rev 3
5/26
AN2650
List of figures
5
List of figures
Figure 1.
Application schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2.
Low drop reverse polarity protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3.
Stepping modes (Auto decay mode, fast decay without delay time) . . . . . . . . . . . . . . . . . 10
Figure 4.
Auto decay, fast decay without delay time at phase 0 and 8 . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5.
SPI transfer timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6.
Slow decay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 7.
Fast decay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 8.
Mixed decay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 9.
Auto decay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10.
Stall detection function overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 11.
Cross current protection time and slew rate for maximum DC . . . . . . . . . . . . . . . . . . . . . . 20
Figure 12.
Current flow and voltage drop during fast decay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 13.
Power SSO24 solder mask layout (all values in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 14.
Power SSO24 solder mask opening (all values in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . 24



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