L9935 STMicroelectronics, L9935 Datasheet
L9935
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L9935 Summary of contents
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... L9935 L9935013TR April 2011 Two-phase stepper motor driver Description The L9935 is a two-phase stepper motor driver circuit suited to drive bipolar stepper motors. The device can be controlled by a serial interface (SPI). All protections required to design a well protected system (short-circuit, over temperature, cross conduction etc.) are integrated. ...
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... Application hints using a high resistive stepper motor . . . . . . . . . . . . . . . 18 5.11.1 5.12 Limitation of the diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.13 Serial data interface (SPI 5.13.1 2/29 No current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Turning Chopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Reversing phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Chopper control by oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Over temperature pre alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Startup behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Startup of the serial data interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Doc ID 5198 Rev 9 L9935 ...
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... L9935 5.14 Test condition for all propagation times . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.15 Cascading several devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.16 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.17 Electromagnetic emission classification (EME Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Doc ID 5198 Rev 9 Contents 3/29 ...
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... Diagnosis description - bit7 and bit6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 9. Test condition for all propagation times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 10. Full step mode control sequences and diagnosis response . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 11. Half step mode control sequences and diagnosis response . . . . . . . . . . . . . . . . . . . . . . . 24 Table 12. Electromagnetic emission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Table 13. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4/29 Doc ID 5198 Rev 9 L9935 ...
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... SPI data/clock timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Figure 10. Cascading several stepper motor drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Figure 11. Control sequence for 3 Stepper motor drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Figure 12. Paralleling several devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Figure 13. State diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Figure 14. EMC compatibility for L9935 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Figure 15. PowerSO20 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . Sense Doc ID 5198 Rev 9 List of figures . . . . . . . . . 16 S 5/29 ...
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... Block diagram 1 Block diagram Figure 1. Block diagram 6/29 Doc ID 5198 Rev 9 L9935 ...
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... L9935 2 Pin description Figure 2. Pin connection (top view) Table 2. Pin function Pin No 1,10,11, OUT 12 13 OUT Name Ground. (All ground pins are internally connected to the frame of the GND device). OUT Output1 of full bridge 1 A1 SCK Clock for serial interface (SPI) SDI ...
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... FR 4 board with through holes for heat transfer and external thj-amb, FR4 heat sink applied) T Storage temperature S T Typical thermal shut-down temperature SD 8/29 Parameter internally clamped GND depending on the S Parameter Doc ID 5198 Rev 9 L9935 Value Unit -0 -0 current direction ±1.2 A ±2.5 A -0.3 to 6.2 V -0 ...
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... L9935 3.3 Electrical characteristics 8 V ≤ V ≤ -40 °C ≤ Parameters are tested at 125 °C. Values at 140 °C are guaranteed by design and correlation. Table 5. Electrical characteristics Symbol Parameter Supply Total supply current (both bridges Off) I Operating supply current SOP supply current CC Full bridges ...
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... Currents of combinations LH and LL are sensed at the external resistors. The Current of bit combination HL is sensed internally and cannot be adjusted by changing the sense resistors. 10/29 Test condition High Low SDO SDO EN = LOW EN = LOW - OSC EN = High →Low - - - - Doc ID 5198 Rev 9 L9935 Min. Typ. Max. Unit μA - μA -3 -10 - 0. 2.2 2.46 2 ...
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... L9935 4 Application hints Figure 3. General application circuit proposal C1 and C2 should be placed as close to the device as possible. Low ESR advantageous. Peak currents through C1 and C2 may reach 2 A. Care should be taken that the resonance of C1, C2 together with supply wire inductances is not the chopping frequency or a multiple of it. ...
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... Basic structure The L9935 is a dual full bridge driver for inductive loads with a chopper current regulation. Outputs A1 and A2 belong to full bridge A Outputs B1 and B2 belong to full bridge B. The polarity of the bridges can be controlled by bit0 and bit3 (for full bridge A, bit3, for full bridge B, bit0) ...
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... L9935 5.2 Full bridge function Figure 5. Displays a full bridge including the current sense circuit. 5.2.1 No current Bit 5, bit 4 (corresponding bit 2 and bit1 for bridge B) both are HIGH, the current logic will inhibit all drivers D signal of the current sense comparator comp 1. 5.2.2 ...
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... MS1 and MS2 blank switching spikes that could lead to errors of the current control circuit. Figure 6. Principal chopper control circuit 14/29 , the load and M 21 will be turned off. So now the current will flow through D 12 Doc ID 5198 Rev 9 before reversing phase. Reversing 12 , the load and 22 L9935 ...
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... So several devices can be synchronized. 5.3 Protection and diagnosis functions The L9935 provides several protection functions and error detection functions. Current limitation usually is customer defined by the external current sense resistors. The current sensed there is used to regulate the current through the stepper motor windings by pulse width modulation ...
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... The error flag is detached from the comparator after t during normal pulse width modulation. 16/ the over current detection is totally blanked. short the current threshold is set to 1.5 times the maximum PWM current PWM Doc ID 5198 Rev 9 L9935 we suggest to turn off the error flag is set PWM ...
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... L9935 5.6 Short from an output to ground The current through the short will be detected by the protection of the source transistor. The source transistor will turn off exceeding a current of typically 1.8 A. Minimum overload detection current is 1 obtain proper current regulation (by the sink transistors and not by source transistor shut down) the maximum current of the PWM regulator should be set to a maximum value of 1 ...
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... Application hints using a high resistive stepper motor The L9935 was originally targeted on stepper chopping stepper motor application with typical resistances of 8..12 Ω. Using motors with higher resistance will work too but diagnosis behavior will slightly change. This paragraph shows the details that should be taken in account using diagnosis for high resistive motors ...
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... L9935 5.12 Limitation of the diagnosis The diagnosis depends on either detecting an overcurrent of more than typically 1.8 A through the source transistor or on not detecting a flyback pulse detecting severe overcurrents of the sink transistor immediately after turn on. ● Small currents bypassing the load will not be detected. ...
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... SCK) have been transferred. If this is not the case the input will be ignored and the bridges will maintain the same status as before. SDO is a tristate output. SDO is active while CSN = LOW, while CSN = HIGH SDO is high resistive. Figure 9. SPI data/clock timing 20/29 Doc ID 5198 Rev 9 L9935 ...
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... L9935 5.14 Test condition for all propagation times Unless otherwise specified) HIGH ≥ LOW ≤ 0 Enable: ENN Low < 0.8 V, ENN High > V Table 9. Test condition for all propagation times Symbol Parameter f SCK-Frequency SCLK SCK stable before and after t 1 CSN = 0 t Width of SCK high pulse ...
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... The whole frame now consists of n byte the number of devices used. Figure 10. Cascading several stepper motor drivers Figure 11. Control sequence for 3 Stepper motor drivers Figure 12. Paralleling several devices Here usually only one stepper motor driver is selected at a time while all others are deselected. 22/29 Doc ID 5198 Rev 9 L9935 ...
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... L9935 5.16 Application information For driving a stepper motor we suggest to use the following codes. The columned ’SDO correct’ shows the data returned at SDO in correct function. The columns presented under ’Error cases’ display the diagnosis bits if errors are detected. Examples of control sequences. ...
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... So a short to ground only is detected on one branch of the bridge. S Doc ID 5198 Rev therm. (1) (1) ( alarm GND GND GND L9935 therm. shut down (reset operating codes) 76543210 00111111 00111111 00111111 00111111 00111111 00111111 00111111 00111111 00111111 00111111 00111111 00111111 00111111 00111111 00111111 00111111 00111111 ...
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... L9935 5.17 Electromagnetic emission classification (EME) Electromagnetic emission classes presented below are typical data found on bench test. For detailed test description please refer to ’Electromagnetic Emission (EME) Measurement of Integrated Circuits 1GHz’ of VDE/ZVEI work group 767.13 and VDE/ZVEI work group 767.14 or IEC project number 47A 1967Ed. This data is targeted to board designers to allow an estimation of emission filtering effort required in application ...
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... Functional description Figure 14. EMC compatibility for L9935 26/29 Doc ID 5198 Rev 9 L9935 ...
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... L9935 6 Package information In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ® ECOPACK trademark. Figure 15. PowerSO20 mechanical data and package dimensions Doc ID 5198 Rev 9 Package information ® ...
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... Revision 6 Initial release. Updated at the new corporate template. 7 Corrected the Figure Updated Figure 2: Pin connection (top view) on page 8 Updated Section 6: Package information on page 9 Updated Section 5.10: Open load on page Doc ID 5198 Rev 9 Changes 14. 7. 27. 17. L9935 ...
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... L9935 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...