STSPIN820 Advanced 256 microsteps integrated motor driver with step-clock and direction interface Datasheet - production data Applications 3D printers Medical equipment Industrial 2D printers Textile and sewing machines CCTV, security and dome cameras ATM and cash handling machines QFN 4 x 4 - 24 lead Office and home automation POS Robotics Features Operating voltage from 7 to 45 V Description Maximum output current 1.
Contents STSPIN820 Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 Thermal data . . . . . . . . . . . . . . . . .
STSPIN820 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of figures STSPIN820 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. 4/29 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 UVLO protection management .
STSPIN820 1 Block diagram Block diagram Figure 1. Block diagram 74 67-0 075 74 45#:=3&4&5 %"$ 74 065" 0$=4$ &/= '"6-5 4&/4&" 7SFMFBTF 065" $0/530-0(*$ 45$, 0$=4$ 4&/4&" %*3 74 .0%& 4/4" %"$ .0%& .0%& 0$=4$ %&$": 4UFQQFS NPUPS 065# 4&/4&# 50'' 0TDJMMBUPS 0$=4$ 065# 4&/4&# 4/4# (/% 3&' ".
Electrical data STSPIN820 2 Electrical data 2.1 Absolute maximum ratings Table 1. Absolute maximum ratings Symbol Parameter Test condition Value Unit VS Supply voltage - -0.3 to 48 V VIN Logic input voltage - -0.3 to 5.5 V VOUT,diff Differential voltage between VS, OUTx1, OUTx2 and SENSEx pins - up to 48 V VSENSE Sense pins voltage - -2 to 2 V Reference voltage input - -0.3 to 2 V - 1.
STSPIN820 2.4 Electrical data ESD protection ratings Table 4.
Electrical characteristics 3 STSPIN820 Electrical characteristics Testing conditions: VS = 36 V, Tj = 25 °C, unless otherwise specified. Table 5. Electrical characteristics Symbol Parameter Test condition Min. Typ. Max. Unit General VSth(ON) VS turn-on threshold VS rising from 0 V - 6.0 6.5 V VSth(HYST) VS turn-off threshold hysteresis VS falling from 7 V - 0.4 - V No commutations EN = 0 RTOFF = 10 k - 2.3 2.75 No commutations EN = 1 RTOFF = 10 k - 2.7 3 0.
STSPIN820 Electrical characteristics Table 5. Electrical characteristics (continued) Symbol Parameter Test condition Min. Typ. Max.
Pin connection 4 STSPIN820 Pin connection 50'' .0%& .0%& .0%& %*3 45$, Figure 2. Pin connection (top view) 3&' %&$": (/% &/='"6-5 (/% 45#:=3&4&5 4/4# 4&/4&" 4&/4&# 4&/4&" 4&/4&# 065" 74 74 065# 065# 4/4" 065" &1"% ". Note: The exposed pad must be connected to ground. Table 6. Pin description 10/29 No.
STSPIN820 Pin connection Table 6. Pin description (continued) No. Name Type 12 OUTB1 Power output Power bridge output side B1 13 SENSEB2 Power output Sense output of the bridge B 14 SENSEB1 Power output Sense output of the bridge B 15 SNSB Analog input Full-bridge B current regulator sense input 16 STBY\RESET Logic input Standby\reset input. When forced low the device enters in low consumption mode. EN\FAULT Logic input\ open-drain output Logic input 5 V compliant with open-drain o
Functional description 5 STSPIN820 Functional description The STSPIN820 is a stepper motor driver integrating a microstepping sequencer (up to 1/256th step), two PWM current controllers and a power stage composed by two fullyprotected full-bridges. 5.1 Power supply and standby The device is supplied through the VS pins, the two pins must be at the same voltage. At power-up the power stage is disabled and the FAULT pin is forced low until the VS voltage rises above the VSth(ON) threshold.
STSPIN820 5.2 Functional description Microstepping sequencer At each STCK rising edge, the sequencer of the device is increased (DIR input high) or decreased (DIR input low) of a module selected through the MODEx inputs as listed in Table 7. The sequencer is a 10-bit counter that sets the reference value of the PWM current controller and the direction of the current for both of the full-bridges. Note: The MODE1, MODE2 and MODE3 configuration can be changed in any time and it is immediately applied.
Functional description STSPIN820 When the full-step mode is set, the reference value of the PWM current controllers and the direction of the currents are set as listed in Table 8. Table 8.
STSPIN820 Functional description Table 10. Example Note: 1/2 step 1/4 step 1/8 step VREF phase A VREF phase B Sequencer value 1 1 1 0% 100% 0000000000 home state - - 2 19.509% 98.079% 0000100000 - 2 3 38.268% 92.388% 0001000000 - - 4 55.557% 83.147% 0001100000 2 3 5 70.711% 70.711% 0010000000 - - 6 83.147% 55.557% 0010100000 - 4 7 92.388% 38.268% 0011000000 - - 8 98.079% 19.509% 0011100000 3 5 9 100% 0% 0100000000 - - 10 98.079% -19.
Functional description 5.3 STSPIN820 PWM current control The device implements two independent PWM current controllers, one for each full-bridge. The voltage of the sense pins (VSNSA and VSNSB) is compared to the respective internal reference voltage based on the sequencer value (seeTable 8 and Table 9). When VSNSX > VREFX the integrated comparator is triggered, the OFF time counter is started and the decay sequence is performed.
STSPIN820 Functional description The choice of the sense resistors value must take into account two main issues: The sensing resistor dissipates energy and provides dangerous negative voltages on the SENSE pins during the current recirculation. For this reason the resistance of this component should be kept low (using multiple resistors in parallel will help obtaining the required power rating with standard resistors).
Functional description STSPIN820 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 50'' 30'' ". 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.
STSPIN820 5.4 Functional description Overcurrent and short-circuit protections The device embeds circuitry protecting each power output against the overload and shortcircuit conditions (short-circuit to ground, short-circuit to VS and short-circuit between outputs). When the overcurrent or the short-circuit protection is triggered the power stage is disabled and the EN\FAULT input is forced low through the integrated open-drain MOSFET discharging the external CEN capacitor (refer to Figure 8).
Functional description STSPIN820 But tcharge is normally very higher than tdischarge we can consider only the second one contribution: V DD – R EN I PD – V RELEASE t DIS R EN C EN I n ----------------------------------------------------------------------------- V DD – R EN I PD – V IH Where VDD is the pull-up voltage of the REN resistor. Figure 9. Disable time versus REN and CEN values (VDD = 3.
STSPIN820 Functional description Figure 10. Overcurrent threshold versus temperature normalized at 25 °C /PSNBMJ[FE 0$ UISFTIPME 5FNQFSBUVSF <$> ".
Functional description 5.5 STSPIN820 Thermal shutdown The device embeds circuitry protecting it from the overtemperature condition. When the thermal shutdown temperature is reached the power stage is disabled and the EN\FAULT input is forced low through the integrated open-drain MOSFET (refer to Figure 11). The protection and the EN\FAULT output are released when the IC temperature returns below a safe operating value (TjSD - TjSD,Hyst). Figure 11. Thermal shutdown management .$6 %&7*$& '"6-5@.
STSPIN820 5.6 Functional description ESD protection strategy Figure 12. ESD protection strategy 74 7 &4% BDUJ WF DMBNQ 108&3 1$) 7 JOUFSOBM SFH 065"Y #Y (/% 4&/4&" # 4&/4&" # */Y .0%& 108&3 /$) 7 &4% BDUJ WF DMBNQ (/% */Y 45$, %*3 .0%& %&$": 45#:=3&4&5 &/='"6-5 3&' 50'' #FMPX (/% 4/4" # ".
Typical applications 6 STSPIN820 Typical applications Table 12. Typical application values Name Value CS 330 nF CSPOL 33 µF RSNSA, RSNSB 330 m / 1 W CEN 10 nF REN 39 k CSTBY 1 nF RSTBY 18 k ROFF 10 k (TOFF 13 µs) Figure 13. Typical application schematic 74 7%% 3 &/ 7%% $4 3 45#: $45#: 74 45#:=3&4&5 $410- 74 065" &/='"6-5 $&/ 065" 45$, 4&/4&" %*3 %&$": .0%& 4&/4&" 4541*/ .0%& 065# 4&/4&# 3&' 4&/4&# 50'' 3 0'' 4UFQQFS NPUPS 065# .0%& 18.
STSPIN820 7 Layout recommendations Layout recommendations The STSPIN820 integrates the power stage; in order to improve the thermal dissipation, the exposed pad must be connected to the ground plane on the bottom layer using multiple vias equally spaced. This ground plane acts as a heatsink, for this reason it should be as wide as possible. The voltage supply VS must be stabilized and filtered with a ceramic bypass capacitor, typically 330 nF.
Package information 8 STSPIN820 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® is an ST trademark. 8.1 TFQFPN 4 x 4 x 1.05- 24L package information Figure 15. TFQFPN 4 x 4 x 1.05- 24L package outline #0550.
STSPIN820 Package information Table 13. TFQFPN 4 x 4 x 1.05 - 24L package mechanical data Dimensions (mm) Symbol Note Min. Typ. Max. A 0.90 1.00 1.10 - A1 0.00 0.02 0.05 - b 0.20 0.25 0.30 (1) D 3.90 4.00 4.10 - D2 2.55 2.60 2.65 - E 3.90 4.00 4.10 - E2 2.55 2.60 2.65 - e - 0.50 - - L 0.35 0.40 0.45 - k - 0.30 - - ddd - 0.05 - - 1. Dimension “b” does not include the dambar protrusion.
Ordering information 9 STSPIN820 Ordering information Table 14. Device summary 10 Order code Package Packaging STSPIN820 TFQFPN 4 x 4 x 1.05 - 24 L Tape and reel Revision history Table 15. Document revision history 28/29 Date Revision Changes 27-Sep-2017 1 Initial release. 19-Dec-2017 2 Added Section 2.3: Thermal data on page 6. Added Note: on page 17. Minor modifications throughout document.
STSPIN820 IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.
