NXP Semiconductors PCA9629A User manual

UM10798
PCA9629A advanced stepper motor controller demo kit
(OM13285)
Rev. 1 — 17 June 2014 User manual
Document information
Info Content
Keywords Fm+ I2C-bus, PCA9629A, GPO, LPCXpresso LPC1343 daughter card,
sensor, stepper motor, motor direction, speed and ramp control
Abstract 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.

UM10798 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
User manual Rev. 1 — 17 June 2014 2 of 35
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
NXP Semiconductors UM10798
PCA9629A advanced stepper motor controller demo kit (OM13285)
Revision history
Rev Date Description
1.0 20140617 User manual; initial version

UM10798 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
User manual Rev. 1 — 17 June 2014 3 of 35
NXP Semiconductors UM10798
PCA9629A advanced stepper motor controller demo kit (OM13285)
1. Introduction
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.
Fig 1. OM13285 PCA9629A stepper motor controller demo board Rev. 2.2

UM10798 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
User manual Rev. 1 — 17 June 2014 4 of 35
NXP Semiconductors UM10798
PCA9629A advanced stepper motor controller demo kit (OM13285)
1.1 Application overview
The PCA9629A Demo board is designed for easy setup and ease of operation. The demo
functions are executed by pressing a control button on the demo board. The PCA9629A
Demo functions supported by the demo board and firmware include:
Mode — This selects Full Step, Half Step, or Two-Phase drive.
Direction — This selects clockwise or counter-clockwise starting direction.
Rotate Fixed Steps — This rotates the motor a fixed number of steps or ramp-up and
ramp-down control function.
Rotate Fixed Rotations — This rotates the motor for a fixed number of rotations or ramp
up and down control function.
Rotate and Reverse — Rotates the motor for a fixed number of rotations, stops (wait a
delay time), reverses, and rotates the same fixed number of rotations in the other
direction.
Continuous Rotation — Continuously rotate the motor and the button is pressed again
to change speed with ramp control.
Interrupt mode — This starts the motor rotating in the ‘Interrupt Auto clear mode’ where it
starts one direction until the optical interrupter connected to the motor shaft passes
through one of the slotted optical switches. It then stops (wait a delay timer), and reverses
until an interrupter passes through the second slotted optical switch. This process
continues until the button is pressed again to stop.
Some of the other features of the PCA9629A demo board are:
•Programmable I2C-bus address selection up to 16 slave devices
•Optional either MOSFET with Schottky diode or Darlington sink driver
•Access to all PCA9629A I/O, including the ability to isolate any or all device pins
•Test point access to monitor many onboard signals
•Flexibility to use external controller with onboard drive
•Requires +12 V input, has onboard +5 V and +3.3 V regulators
•Flexible reprogramming, firmware updating via several methods
–USB (X1)
–LPC-Link USB (J3 in LPCXpresso daughter board)
–RS-232 (X2)
2. PCA9629A stepper motor controller demo kit
2.1 PCA9629A demo kit (Rev. 2.2) contents
•PCA9629A demo board with LPC1343 LPCXpresso daughter board
•+12 V DC power adapter
•Stepper motor board with sensor
•Motor cable (6-wire)
•Sensor cable (4-wire)
•Demo board quick start instructions

UM10798 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
User manual Rev. 1 — 17 June 2014 5 of 35
NXP Semiconductors UM10798
PCA9629A advanced stepper motor controller demo kit (OM13285)
3. System overview
3.1 The PCA9629A stepper motor controller
Stepper motors can be driven and controlled in a number of different ways, depending on
the type of motor being driven and the application requirements for the motor. The most
basic form of drive is single-phase drive or ‘wave drive’. The other common drive modes
include 2-phase, 1⁄2-step, and micro-step. The main advantage of the 1⁄2-step or
micro-step mode is to break the steps into smaller increments to minimize resonance
effects that could be a problem in certain applications. Stepper motor can also be
designed for unipolar and/or bipolar drive. The PCA9629A is designed for single-phase,
2-phase, and 1⁄2-step operation. This application only deals with interface to a unipolar
motor.
The PCA9629A has an internal oscillator, so no external components are required. Some
of the other features of the PCA9629A include:
•Stand-alone operation: generates motor coil drive phase sequence signals for use
with an external high current driver to off-load master controller/micro
•Programmable step rate: 333.3 kpps to 0.3 pps with ±3 % accuracy
•Programmable number of steps and motor action either multiple times (1 to 255) or
continuously
•Sensor enabled drive control: linked to interrupt from P0 and P1 inputs with noise filter
enable or disable feature
•Programmable four GPIO ports and four GPO ports
•Programmable ramp-up from start and ramp-down to stop
•Programmable re-enable ramp-up or ramp-down to change ramp rate curve on the fly
•Programmable start, ramp-up/ramp-down, stop or reverse the direction either
clockwise or counter-clockwise of rotation control of stepper motor
•Programmable restart motor with new speed and operation while motor is still running
•Programmable loop delay timer for motor reversal mode
•Interrupt auto clear function linked extra steps, direction reversal and stop control
without microcontroller handling
•32-bit step counter to count output steps
•Selectable active hold (last state), power on, power off, or released states for motor
shaft
•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 motor coils
•Up to 1000 pF loads with 100 ns rise and fall times on outputs