The PCA9629A is an I2C-bus controlled low-power CMOS device that provides all thelogic and control required to drive a four phase stepper motor. PCA9629A is intended tobe used with external high current drivers to drive the motor coils. The PCA9629Asupports three stepper motor drive formats: one-phase (wave drive), two-phase, andhalf-step. In addition, when used as inputs, four General Purpose Input/Outputs (GPIOs)allow sensing of logic level output from optical interrupter modules and generateactive LOW interrupt signal on the INT pin of PCA9629A. This is a useful feature insensing home position of motor shaft or reference for step pulses. Upon interrupt, thePCA9629A can be programmed to automatically stop the motor, re-start motor, enableextra steps or reverse the direction of rotation of motor.

Output wave train is programmable using control registers. The control registers areprogrammed via the I2C-bus. Features built into the PCA9629A provide highly flexiblecontrol of stepper motor, off-load bus master/micro and significantly reduce I2C-bus traffic.These include control of step size, number of steps per single command, number ofactions from 1 to 255 or continuous rotations and direction of rotation. Re-start motor fornew speed and operation without waiting for motor stop. A ramp-up on start and/orramp-down on stop is also provided with re-enable ramp-up or ramp-down to change theramp rate curve on the fly.

The PCA9629A is available in a 16-pin TSSOP package and is specified over the?40 °C to +85 °C industrial temperature range.

• Generate motor coil drive phase sequence signals with four outputs for use withexternal high current drivers to off-load CPU
• Four balanced push-pull type outputs capable of sinking 25 mA or sourcing 25 mA forglueless connection to external high current drivers needed to drive unipolar steppermotor coils
  • Up 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 motorshaft
• 32-bit step counter to count output steps
• Interrupt features
  • Active LOW open-drain interrupt output
  • Programmable watchdog timer with option to generate interrupt, reset device orstop 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 outputstates 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 transistorcircuit
  • 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
• 4.5 V to 5.5 V operation
• 1 MHz Fast-mode Plus (Fm+) compatible I2C-bus serial interface with 30 mAhigh drive capability on SDA output for driving high capacitive buses
• Active LOW reset (RESET) input pin resets device to power-up default state: can beused to recover from bus stuck condition
• All Call address allows programming of more than one device at the same time withthe same parameters
• 16 programmable slave addresses using two address pins
• ?40 °C to +85 °C operation
• ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM perJESD22C101
• Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
• Package offered: TSSOP16

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