Industrial
- Factory Automation
- Human Machine Interface
- Industrial Connectivity
- Motion and Motor Control
- Building Automation
- Power and Energy
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Overview
The PCA9629A is an I²C-bus controlled low-power CMOS device that provides all the logic and control required to drive a four phase stepper motor. PCA9629A is intended to be used with external high current drivers to drive the motor coils. The PCA9629A 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 PCA9629A. This is a useful feature in sensing home position of motor shaft or reference for step pulses. Upon interrupt, the PCA9629A can be programmed to automatically stop the motor, re-start motor, enable extra steps 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 PCA9629A 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 actions from 1 to 255 or continuous rotations and direction of rotation. Re-start motor for new speed and operation without waiting for motor stop. A ramp-up on start and/or ramp-down on stop is also provided with re-enable ramp-up or ramp-down to change the ramp 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.
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 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 motor shaft
- 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 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
- 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 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 per JESD22C101
- Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
- Package offered: TSSOP16
Target Applications
- Amusement machines
- Gaming and slot machines
- Consumer home appliances or toys
- Industrial automation
- HVAC and building climate control systems
- Robotics
- Security and surveillance camera
- Variable-speed fans and pumps
- Vending machines
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 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 motor shaft
- 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 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
- 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 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 per JESD22C101
- Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
- Package offered: TSSOP16
Target Applications
- Amusement machines
- Gaming and slot machines
- Consumer home appliances or toys
- Industrial automation
- HVAC and building climate control systems
- Robotics
- Security and surveillance camera
- Variable-speed fans and pumps
- Vending machines
