PCA9629APWJ

The PCA9629 is an I²C-bus controlled low-power CMOS device that provides all the logic and control required to drive a four phase stepper motor. PCA9629 is intended to be used with external high current drivers to drive the motor coils. The PCA9629 supports three stepper motor drive formats: one-phase (wave drive), two-phase, and half-step. In addition, when used as inputs, four General Purpose Input/Outputs (GPIOs) allow sensing of logic level output from optical interrupter modules and generate active LOW interrupt signal on the INT pin of PCA9629. This is a useful feature in sensing home position of motor shaft or reference for step pulses. Upon interrupt, the PCA9629 can be programmed to automatically stop the motor or reverse the direction of rotation of motor. Output wave train is programmable using control registers. The control registers are programmed via the I²C-bus. Features built into the PCA9629 provide highly flexible control 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 of full rotations and direction of rotation. A ramp-up on start and/or ramp-down on stop is also provided. The PCA9629 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 motor coils
  • Up to 1000 pF loads with 100 ns rise and fall times
• Built-in 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: 344.8 kpps to 0.3 pps with ±5 % accuracy
• Programmable ramp-up on start and ramp-down to stop
• Programmable steps and rotation control
• Sensor enabled drive control: linked to interrupt from I/O pins
• Direction control of motor shaft
• Selectable active hold, power off or released states for motor shaft
• Four general purpose I/Os:
  • Configured to sense