NXP PCA9629A步进马达控制解决方案

1、NXP PCA9629A步进马达控制解决方案关键字：工业控制,马达控制,步进马达NXP公司的PCA9629A是I2C总线控制的低功耗CMOS器件,为驱动四相步进马达提供了所需的所有逻辑和控制特性.四个平衡的推挽输出可提供25 mA电流,无缝连接到外接大电流驱动器.高达1000pF负载和100 ns上升和下降时间,内置1MHz振荡器不需要外接元件,主要用于消费类家用电器或玩具,工业自动化,HVAC和建筑物环境控制系统,变速风扇和泵,零售终端,游戏机等.本文介绍了PCA9629A主要特性和优势,框图和步进马达控制框图,以及OM13285步进马达控制板Rev. 2.2电路图.The PCA9629A

2、 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

3、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 o

4、f 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

5、 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

6、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 speci

7、fied over the -40 degreeC to +85 degreeC industrial temperature range.PCA9629A主要特性和优势: Generate motor coil drive phase sequence signals with four outputs for use with external high current drivers to off-load CPUn Four balanced push-pull type outputs capable of sinking 25 mA or sourcing 25 mA forngl

8、ueless connection to external high current drivers needed to drive unipolar stepper motor coils Up to 1000 pF loads with 100 ns rise and fall timesu Built-in 1 MHz oscillator requires no external componentsn Stepper motor drive control logicn One-phase (wave drive), two-phase, and half-step drive fo

9、rmat logic level outputsn3 % accuracy± Programmable step rate: 333.3 kpps to 0.3 pps with n Programmable ramp-up on start and ramp-down to stopn Programmable re-enable ramp-up or ramp-down to change ramp rate curve on the flyn Programmable re-start motor with new speed and operation while motor

10、 is still runningn Programmable motor action either multiple times (1 to 255) or continuouslyn Programmable loop delay timer for motor reversal moden Programmable steps with clockwise and/or counter-clockwise controln Direction control of motor shaftn Selectable active hold (last state), power on, p

11、ower off or released states for motornshaft 32-bit step counter to count output stepsn Interrupt featuresn Active LOW open-drain interrupt outputu Programmable watchdog timer with option to generate interrupt, reset device orustop motor Programmable motor stop interruptu Sensor enabled drive control

12、: linked to interrupt from GPIO pinsu Programmable interrupt Mask Control for input sourcesu Four stepper motor drive outputs: OUT0 to OUT3n Configured to drive stepper motor outputs and capable to read back the last outputustates when motor is stopped Both output phase and state can be changed at a

13、ny timeu Programmuable 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 mAu Four general purpose I/Os: P0 to P3n Configured to sense logic level outputs from optical interrupter photo transistorucircuit Progr

14、ammable filter timer to suppress spike or noise for P0 and P1 inputsu Configured as outputs to drive (source/sink) LEDs or other loads up to 25 mAu 4.5 V to 5.5 V operationn 1 MHz Fast-mode Plus (Fm+) compatible I2C-bus serial interface with 30 mAnhigh drive capability on SDA output for driving high

15、 capacitive buses Active LOW reset (RESET) input pin resets device to power-up default state: can benused to recover from bus stuck condition All Call address allows programming of more than one device at the same time withnthe same parameters 16 programmable slave addresses using two address pinsnC

16、 operation°C to +85 °40 - n ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM pernJESD22C101 Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mAn Package offered: TSSOP16nPCA9629A应用: Amusement machinesn Gaming and slot machinesn Consumer home appliances or

17、 toysn Industrial automationn HVAC and building climate control systemsn Roboticsn Security and surveillance cameran Variable-speed fans and pumpsn Vending machinesn图1. PCA9629A框图图2. PCA9629A步进马达控制框图PCA9629A demo kit (OM13285) is designed to let customers evaluate the PCA9629A in a realistic applica

18、tion. 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 boar