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PCA9629A步進(jìn)馬達(dá)控制解決方案

文章來源：更新時間：2014/8/2 9:51:00

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NXP公司的PCA9629A是I2C總線控制的低功耗CMOS器件,為驅(qū)動四相步進(jìn)馬達(dá)提供了所需的所有邏輯和控制特性.四個平衡的推挽輸出可提供25 mA電流,無縫連接到外接大電流驅(qū)動器.高達(dá)1000pF負(fù)載和100 ns上升和下降時間,內(nèi)置1MHz振蕩器不需要外接元件,主要用于消費(fèi)類家用電器或玩具,工業(yè)自動化,HVAC和建筑物環(huán)境控制系統(tǒng),變速風(fēng)扇和泵,零售終端,游戲機(jī)等.本文介紹了PCA9629A主要特性和優(yōu)勢,框圖和步進(jìn)馬達(dá)控制框圖,以及OM13285步進(jìn)馬達(dá)控制板Rev. 2.2電路圖.
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 degreeC to +85 degreeC industrial temperature range.

PCA9629A主要特性和優(yōu)勢:
 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

PCA9629A應(yīng)用:

 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

圖1. PCA9629A框圖

圖2. PCA9629A步進(jìn)馬達(dá)控制框圖

PCA9629A demo kit (OM13285) is designed to let customers evaluate the PCA9629A in a realistic application. The demo kit includes a stepper motor board with sensors and the stepper motor demo board with a number of pre-defined functions. The functions are executed by pressing push-button switches on the demo board.
The PCA9629A Stepper Motor Controller Demo Board is designed to let customers evaluate the PCA9629A in a realistic application. The demo board kit includes a Stepper Motor board with sensors and the Stepper Motor Demo Board with a number of pre-defined functions. The parameters used by these functions can be easily changed by changing a configuration header file. To customize the application further, the generalized driver functions used in the demo firmware can be easily modified with a free compiler tool, LPCXpresso, available at: www.lpcware.com/lpcxpresso.