描述 Description

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.

特性 Features

? 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

應(yīng)用 Application

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