SPMD250STP STMicroelectronics, SPMD250STP Datasheet
SPMD250STP
Specifications of SPMD250STP
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SPMD250STP Summary of contents
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... Remote shutdown ■ Home position indication Description The SPMD250STP is a drive module that directly interface a microprocessor to a two phase, bipolar, permanent magnet stepper motors. The phase current is chopper controlled, and the internal phase sequence generation reduces the burden of the controller and it simplifies software development ...
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... Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9.2 Case grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9.3 Thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9.4 Supply line impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9.5 Module protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9.6 Motor connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9.7 Unused inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9.8 Phase current programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9.9 Chopper frequency programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 10 Multi modules application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 11 Thermal operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2/28 Doc ID 14350 Rev 2 SPMD250STP ...
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... SPMD250STP 12 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Doc ID 14350 Rev 2 Contents 3/28 ...
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... Electrical data 1.1 Absolute maximum ratings Table 2. Absolute maximum ratings Symbol V DC supply voltage (pin 18 logic supply voltage (pin 12) SS Tstg Storage temperature range Tcop Operating case temperature range 4/28 Parameter Doc ID 14350 Rev 2 SPMD250STP Value Unit – +105 °C – +85 °C ...
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... SPMD250STP 2 Electrical characteristics °C and V A Table 3. Electrical characteristics Symbol Vs DC supply voltage Vss DC logic supply voltage Is Quiescent supply current Iss Quiescent logic supply current Vi Input voltage Ii Input current Vsat Source/sink saturation voltage Io Phase current IoL Current limit intervention fc Chopper frequency ...
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... Signal timing and block diagram 3 Signal timing and block diagram Figure 1. Signals timing Figure 2. Block diagram 6/28 Doc ID 14350 Rev 2 SPMD250STP ...
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... SPMD250STP Figure 3. Module typical application Signal timing and block diagram SPMD250STP Doc ID 14350 Rev 2 7/28 ...
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... Pin connection 4 Pin connection Figure 4. Connection diagram (top view) 8/28 Doc ID 14350 Rev 2 SPMD250STP ...
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... Gnd1. The oscillator input must be grounded when the unit is externally synchronized. Phase current setting input. A resistor connected between this pin and Gnd1 or Vss, allows the factory set phase current value (2 A for SPMD250STP changed. Logic input that allows the phase current decay mode selection. When high or unconnected the slow decay is selected ...
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... This mode gives the highest torque since two windings are energized at any given time according to the sequence (for clockwise rotation). AB & & & & AB Figure 7 shows the sequence and the corresponding position of the rotor. 10/28 Doc ID 14350 Rev 2 SPMD250STP (Figure 5). ...
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... SPMD250STP 5.3 Half step drive This sequence halves the effective step angle of the motor but gives a less regular torque being one winding or two windings alternatively energized. Eight steps are required for a complete revolution of the rotor. The sequence is & & & & AB ...
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... On the contrary, if the full mode is selected when the counter even-numbered state, the one-phase-on (wave drive) is implemented (see Figure 9. The eight step master sequence corresponding to half step mode 12/28 Figure 11). Doc ID 14350 Rev 2 SPMD250STP Figure 10). ...
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... SPMD250STP Figure 10. Two-phase-on (normal mode) drive Figure 11. One-phase-on (wave mode) drive Phase sequence generation inside the device Doc ID 14350 Rev 2 13/28 ...
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... The slow-decay should be the preferred operating recirculation mode because of the lower power dissipation and low noise operations. 14/28 to allow maximum flexibility in application. SPMD250STP Doc ID 14350 Rev 2 SPMD250STP Figure 12, where the ...
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... SPMD250STP Figure 12. Chopper control with slow decay Figure 13. Chopper control with fast decay Doc ID 14350 Rev 2 Motor current regulation drive current ( ON – – – – recirculation current (Q ON, Q OFF drive current ( ON – – – – recirculation current ( OFF ON 15/28 ...
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... The use of a low ESR, high ripple current 470 µF capacitor located as close to the module as possible is recommended. When space is a limitation µF ceramic multi-layer capacitor connected across the module input pins must be used. 16/28 Figure 4, Figure 19 Figure Doc ID 14350 Rev 2 SPMD250STP and Figure 20). To obtain 16). ...
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... The use of a twisted pair cable with appropriate cross section for each motor phase is recommended to minimize DC losses and RFI problems. 9.7 Unused inputs All the SPMD250STP logic inputs have an internal pull-up, and they are high when unconnected. 9.8 Phase current programming The output current is factory set to a standard 2 A value ...
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... To decrease the chopper frequency a capacitor must be connected between oscillator (pin 8) and Gnd1 (pin 1). The capacitor value is calculated according to the formula: Equation 4 18/28 12 SPMD250STP 1 306 -------------- - Rf kΩ where = = fc 17 – 80.5 4.7fc – ------------------------------ - Doc ID 14350 Rev 2 SPMD250STP 9 SPMD250STP Figure 15). The resistor value is ≥ fc kHz Rf 18kΩ = where fc = kHz 12 1 ...
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... SPMD250STP Figure 15. Chopper frequency programming osc 8 Figure 16. Free air derating curve 12 SPMD250STP 1 f < 17 KHz C Doc ID 14350 Rev 2 User notes 12 osc 8 SPMD250STP 1 f > 17 KHz C Tamb (°C) 19/28 ...
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... Multi modules application In complex systems, many motors must be controlled and driven. In such a case more than one SPMD250STP must be used. To avoid chopper frequencies noise and beats, all the modules should be synchronized. If all the motors are relatively small, the fast decay may be used, the chopper frequency ...
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... SPMD250STP Figure 18. Multi-motor synchronization, large and small motor, slow current decay SPMD250STP SPMD250STP Doc ID 14350 Rev 2 Multi modules application 21/28 ...
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... V IN ● Calculate the power dissipation of the SPMD250STP output power stage. The power dissipation depends on two main factors: – The selected operating mode (FAST or SLOW DECAY) – The selected drive sequence (WAVE, NORMAL, HALF STEP) FAST DECAY. For this mode of operation, the internal voltage drop is Vsatsource + Vsatsink during the ON period i ...
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... SPMD250STP when running for this example: Table 5. Power dissipations Fast Decay Slow Decay ● Calculate the total power dissipation for the SPMD250STP : Ptot = Plogic + Ppw In this example, for slow decay and normal mode Ptot = 1.1 + 6.6 = 7.7 W ● The case temperature can now be calculated: Tcase = Tamb + (Ptot x Rth (7 93.5 ° ...
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... Thermal operating conditions Equation 6 The following table gives the thermal resistance of some commercially available heath-sinks that fit on the SPMD250STP module. Table 6. Thermal resistance Manufacturer Thermalloy Thermalloy Thermalloy Fischer Assman Assman 24/28 ⋅ ⋅ tot Rth = --------------------------- - = ---------------- - = hs R – 3.9 – tot ...
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... SPMD250STP 12 Package mechanical data 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 19. Mechanical data 2.2 (0.87) 2.54 (0.1) 29 ...
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... Package mechanical data Figure 20. Motherboard layout 26/28 Doc ID 14350 Rev 2 SPMD250STP ...
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... SPMD250STP 13 Revision history Table 7. Document revision history Date Revision 23-Jan-2007 19-May-2009 1 First release 2 Updated: Section 9.2 on page Doc ID 14350 Rev 2 Revision history Changes 16, Figure 19 and Figure 20 on page 26 27/28 ...
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... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 28/28 Please Read Carefully: © 2009 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 14350 Rev 2 SPMD250STP ...