Fm+ I²C-Bus Advanced Stepper Motor Controller


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Product Details


Key Features

  • Generate motor coil drive phase sequence signals with four outputs for use with external high current drivers to off-load CPU
  • Four balanced push-pull type outputs capable of sinking 25 mA or sourcing 25 mA for glueless connection to external high current drivers needed to drive unipolar stepper motor coilsUp to 1000 pF loads with 100 ns rise and fall times
  • Built-in 1 MHz oscillator requires no external components
  • Stepper motor drive control logic
  • One-phase (wave drive), two-phase, and half-step drive format logic level outputs
  • Programmable step rate: 333.3 kpps to 0.3 pps with ±3 % accuracy
  • Programmable ramp-up on start and ramp-down to stop
  • Programmable re-enable ramp-up or ramp-down to change ramp rate curve on the fly
  • Programmable re-start motor with new speed and operation while motor is still running
  • Programmable motor action either multiple times (1 to 255) or continuously
  • Programmable loop delay timer for motor reversal mode
  • Programmable steps with clockwise and/or counter-clockwise control
  • Direction control of motor shaft
  • Selectable active hold (last state), power on, power off or released states for motor shaft
  • 32-bit step counter to count output steps
  • 4.5 V to 5.5 V operation
  • 1 MHz Fast-mode Plus (Fm+) compatible I²C-bus serial interface with 30 mA high drive capability on SDA output for driving high capacitive buses
  • Active LOW reset (RESET) input pin resets device to power-up default state: can be used to recover from bus stuck condition
  • All Call address allows programming of more than one device at the same time with the same parameters
  • 16 programmable target addresses using two address pins

Interrupt Features

  • Active LOW open-drain interrupt output
  • Programmable watchdog timer with option to generate interrupt, reset device or stop motor
  • Programmable motor stop interrupt
  • Sensor enabled drive control: linked to interrupt from GPIO pins
  • Programmable interrupt Mask Control for input sources

Four Stepper Motor Drive Outputs: OUT0 to OUT3

  • Configured to drive stepper motor outputs and capable to read back the last output states when motor is stopped
  • Both output phase and state can be changed at any time
  • Programmable time-out timer to set all outputs to zeros when motor is stopped
  • Configured as general purpose outputs to drive (source/sink) loads up to 25 mA

Four general purpose I/Os: P0 to P3

  • Configured to sense logic level outputs from optical interrupter photo transistor circuit
  • Programmable filter timer to suppress spike or noise for P0 and P1 inputs
  • Configured as outputs to drive (source/sink) LEDs or other loads up to 25 mA

Industrial Temperature Range

  • -40 °C to +85 °C operation

ESD Protection

  • Exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22C101

Latch-up Testing

  • Done to JEDEC Standard JESD78 which exceeds 100 mA


  • TSSOP16

Part numbers include: PCA9629APW.


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