●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.
●MoreLess
●## 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
Part 3D Model
