AMT49700KETJTR

AMT49700 Automotive Stepper Driver FEATURES AND BENEFITS • • • • • • • • • • • • • DESCRIPTION Peak motor current up to 1.6 A at 28 V. Low RDS(ON) outputs, 0.5 Ω source and sink typical Continuous operation at high ambient temperature 3.7 to 42 V supply operation Adaptive mixed current decay Synchronous rectification for low power dissipation Output slew control and PWM frequency spreading for EMC noise reduction Internal overvoltage and undervoltage lockout Hot warning and overtemperature shutdown Short-circuit, open-load diagnostics Programmable motion control Configurable through serial interface Simple step and direction control option The AMT49700 is a flexible microstepping stepper motor driver with integrated phase current control, a built in translator, and simple motion control. It is a single chip solution designed to operate bipolar stepper motors in full, half, quarter, eighth and sixteenth step modes, at up to 28 V. The current regulator operates with fixed frequency PWM and uses adaptive mixed current decay to reduce audible motor noise and increase step accuracy. The current in each phase of the motor is controlled through a DMOS full-bridge using synchronous rectification to improve power dissipation. Internal circuits and timers prevent cross-conduction and shoot through when switching between high-side and low-side drives. The outputs are protected from short circuits and features for low load current detection are included. Chip level protection includes hot thermal warning, overtemperature shutdown, overvoltage lockout, and undervoltage lockout. APPLICATIONS • • • • Automotive stepper motors Engine management Headlamp positioning HVAC flap and valve control The AMT49700 is fully controlled and configured through an SPI-compatible serial interface. It provides single step control with adjustable microstep resolution for fine positioning control and programmable motion control providing independent motor acceleration, deceleration, start speed, run speed, and number of steps with a single SPI command. In addition, detailed diagnostics are available on the serial data output. PACKAGE: 32-Pin QFN with Exposed Thermal Pad (suffix ET) The AMT49700 is supplied in a 32-terminal 5 mm × 5 mm QFN package with an exposed thermal pad (package type ET). Not to scale Logic Supply Automotive 12 V Power Net CP1 CP2 STEP OAP DIR MicroController VCP VBB OAM DIAG AMT49700 RESETn OBP SCK SDI SDO STRn GND Stepper Motor OBM GNDPA GNDPB Figure 1: Typical Application Diagram AMT49700-DS, Rev. 1 MCO-0000614 June 7, 2019 AMT49700 Automotive Stepper Driver Selection Guide Part Number Packing Package AMT49700KETJTR 1500 pieces per 7-inch reel 5 mm × 5 mm, 0.9 mm nominal height QFN with exposed thermal pad Table of Contents Features and Benefits............................................................ 1 Description........................................................................... 1 Applications.......................................................................... 1 Package.............................................................................. 1 Typical Application Diagram.................................................... 1 Selection Guide.................................................................... 2 Specifications....................................................................... 3 Absolute Maximum Ratings................................................. 3 Thermal Characteristics...................................................... 3 Pinout Diagram and Terminal List............................................ 4 Functional Block Diagram...................................................... 5 Electrical Characteristics........................................................ 6 Timing Diagrams................................................................... 9 Functional Description......................................................... 12 Terminal Functions........................................................... 12 Stepper Motor Motion Control............................................ 13 Single-Step Control...................................................... 13 Step-Sequence Control................................................. 13 Driving a Stepper Motor.................................................... 14 Phase Current Control...................................................... 14 Phase Current Table......................................................... 15 PWM Frequency.............................................................. 15 PWM Frequency Dither.................................................... 16 Low Power Sleep Mode.................................................... 16 Diagnostics..................................................................... 17 System Diagnostics.......................................................... 18 Supply Voltage Monitors................................................ 18 Temperature Monitors................................................... 18 Bridge and Output Diagnostics.......................................... 19 Shorted Load............................................................... 19 Overcurrent Fault Blanking............................................ 19 Overcurrent Fault Reset and Retry................................. 19 Open-Load Detection.................................................... 19 False State Reset............................................................ 20 Reset Pulse................................................................. 20 Reset Command.......................................................... 20 Sleep.......................................................................... 20 Diagnostic Register Read.............................................. 20 Status Register Read.................................................... 20 Stepping..................................................................... 20 Disable Serial Reset..................................................... 20 Step Angle Reset............................................................. 20 Braking........................................................................... 20 Serial Interface................................................................... 21 Serial Registers Definitions table....................................... 21 Serial Register Content..................................................... 23 Status and Diagnostic Registers........................................ 24 Resetting Status and Diagnostic Registers...................... 25 Serial Register Reference.................................................... 26 Phase Current Table............................................................ 32 Applications Information....................................................... 33 Motor Microstepping......................................................... 33 Phase Table and Phase Diagram................................... 33 Microstepping with the Step Sequencer.......................... 35 Single-Step Control...................................................... 37 Motion Control with the Step Sequencer............................. 39 Profile Command Update.............................................. 41 Continuous Run Mode.................................................. 41 Layout............................................................................ 42 Decoupling.................................................................. 42 Grounding................................................................... 42 Input/Output Structures........................................................ 43 Package Outline Drawing..................................................... 44 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 AMT49700 Automotive Stepper Driver SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS [1] Characteristic Symbol Load Supply Voltage Rating Unit VBB Notes –0.3 to 42 V Terminal CP1 VCP1 –0.3 to VBB + 0.3 V Terminal CP2 VCP2 –0.3 to VBB + 8 V Terminal VCP VCP –0.3 to VBB + 8 V –0.3 to 6 V –0.3 to 6 V Terminals STEP, DIR, SCK, SDI, SDO, STRn Terminal RESETn VRESETn Terminal DIAG Can be pulled to VBB with 33 kΩ VDIAG –0.3 to 40 V –0.3 to VBB V –0.1 to 0.1 V TA –40 to 150 °C TJ(max) 165 °C 175 °C –55 to 150 °C Terminals OAP, OAM, OBP, OBM Terminals GNDPA, GNDPB VGNDPA, VGNDPA Ambient Operating Temperature Range [2] Maximum Continuous Junction Temperature Transient Junction Temperature TJt Storage Temperature Range Tstg [1] With All ground terminals must be connected together Overtemperature event not exceeding 10 seconds, lifetime duration not exceeding 10 hours, ensured by design and characterization. respect to GND by power dissipation [2] Limited THERMAL CHARACTERISTICS: May require derating at maximum conditions; see application information Characteristic Package Thermal Resistance [3] Additional Symbol RθJA Test Conditions [3] High-K PCB (multilayer with significant copper areas, based on JEDEC standard JESD51-7) Value Unit 30 °C/W thermal information available on the Allegro website. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 3 AMT49700 Automotive Stepper Driver NC CP1 NC GND NC VBB NC OAP 32 31 30 29 28 27 26 25 PINOUT DIAGRAM AND TERMINAL LIST CP2 1 24 GNDPA NC 2 23 NC VCP 3 22 OAM NC 4 21 NC RESETn 5 20 NC DIR 6 19 OBM STEP 7 18 NC STRn 8 17 GNDPB 13 14 15 NC VBB NC OBP 12 DIAG 16 11 10 SDI SDO 9 SCK PAD Package ET, 32-Pin eQFN Pinout Diagram Terminal List Table Number Name 31 CP1 Charge Pump Capacitor Function 1 CP2 Charge Pump Capacitor 12 DIAG Diagnostic output 6 DIR Direction Input 29 GND Ground 24 GNDPA Power Ground for A Phase 17 GNDPB Power Ground for B Phase 22 OAM Bridge A negative output 25 OAP Bridge A positive output 19 OBM Bridge B negative output 16 OBP Bridge B positive output 5 RESETn 9 SCK Serial Clock Input 10 SDI Serial Data Input 11 SDO Serial Data Output 7 STEP Step Input 8 STRn Serial Strobe (chip select) Input 27 VBB Main Supply 14 VBB Main Supply 3 VCP Pump Storage Capacitor PAD – Standby Mode Control Exposed Thermal Pad Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 4 AMT49700 Automotive Stepper Driver FUNCTIONAL BLOCK DIAGRAM CP1 Oscillator REF 6-bit DAC Regulator REF CP2 Charge Pump VBB SENSA VCP VBAT VBB OAP System Control & Registers SCK SDI SDO STRn Serial Interface STEP DIR RESETn Motion Control PWM Control OAM GNDPA Bridge Control Logic Gate Drive VBB PWM Control OBP OBM REF 6-bit DAC DIAG VBB VBAT GNDPB SENSB Undervoltage, Overvoltage Hot Warning, Over Temp Short Detect, Open Detect PAD GND Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 5 AMT49700 Automotive Stepper Driver ELECTRICAL CHARACTERISTICS: Valid at TJ = –40°C to 150°C, VBB = 5.5 to 28 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units SUPPLIES Supply Voltage Range [4][5] Supply Quiescent Current VBB IBBQ Logic I/O Regulator Voltage VLIO Charge Pump Voltage VCP No unsafe states Outputs driving 0 – 42 V 5.5 – VBBOV V DIS = 1 – – 25 mA Sleep Mode, VBB = 12 V, GTS = 1, STRn = 1 or VRESETn < 0.5 V, TJ = 25°C – 20 40 µA Sleep Mode, VBB = 12 V, GTS = 1, STRn = 1 or VRESETn < 0.5 V, TJ = 150°C – 60 100 µA VLR = 0 3.1 3.3 3.5 V VLR = 1 4.8 5.0 5.2 V With respect to VBB, VBB > 7.5 V, DIS = 1, GTS = 0, RESETn = 1 – 7.0 – V VBB ≥ 7 V, IOUT = –1 A [1], TJ = 25°C – 500 600 mΩ VBB = 13.5 V, IOUT = MOTOR BRIDGE OUTPUT High-Side On-Resistance High-Side Body Diode Forward Voltage Low-Side On-Resistance Low-Side Body Diode Forward Voltage Output Leakage Current [1] Output Slew Rate RONH VFH RONL VFL ILO dVO/dt –1 A [1], – 900 1100 mΩ IF = 1 A TJ = 150°C – – 1.4 V IF = 0.1 A – – 1.2 V VBB ≥ 7 V, IOUT = 1 A, TJ = 25°C, MXI[4:0] = 3…31 – 500 600 mΩ VBB = 13.5 V, IOUT = 1 A, TJ = 150°C, MXI[4:0] = 3…31 – 900 1100 mΩ VBB ≥ 7 V, IOUT = 150 mA, TJ = 25°C, MXI[4:0] = 0…2 – 1200 1800 mΩ VBB = 13.5 V, IOUT = 150 mA, TJ = 150°C, MXI[4:0] = 0…2 – 2100 3000 mΩ IF = –1 A [1] – – 1.4 V IF = –0.1 A [1] – – 1.2 V GTS = 0, RESETn = 1, DIS = 1, VO = VBB – 65 120 µA GTS = 0, RESETn = 1, DIS = 1, VO = 0 V –200 –120 – µA GTS = 1 or VRESETn < 0.5 V, VO = VBB –