AMIS-30521_10 Datasheet, PDF (1/28 Pages) ON Semiconductor – Micro-Stepping Motor Driver

AMIS-30521, NCV70521
Micro-Stepping Motor Driver
Introduction
The AMIS−30521/NCV70521 is a micro−stepping stepper motor
driver for bipolar stepper motors. The chip is connected through I/O
pins and a SPI interface with an external microcontroller. The
AMIS−30521/NCV70521 contains a current−translation table. It takes
the next micro−step depending on the clock signal on the “NXT” input
pin and the status of the “DIR” (= direction) register or input pin. The
chip provides a so−called “Speed and Load Angle” output. This allows
the creation of stall detection algorithms and control loops based on
load−angle to adjust torque and speed. It is using a proprietary PWM
algorithm for reliable current control.
The AMIS−30521/NCV70521 is implemented in I²T100
technology, enabling both high voltage analog circuitry and digital
functionality on the same chip. The chip is fully compatible with the
automotive voltage requirements.
The 521 is ideally suited for general purpose stepper motor
applications in the automotive, industrial, medical and marine
environment. The AMIS−30521 is intended for use in industrial
applications. The NCV70521 version is qualified for use in
automotive applications.
Features
• Dual H−Bridge for 2 Phase Stepper Motors
• Programmable Peak−Current Up to 1.2 A Continuous (1.5 A Short
Time), Using a 5−Bit Current DAC
• On−Chip Current Translator
• SPI Interface
• Speed and Load−Angle Output
• 7 Step Modes from Full Step−up to 32 Micro−Steps
• Fully Integrated Current−Sense
• PWM Current Control with Automatic Selection of Fast and Slow
Decay
• Low EMC PWM with Selectable Voltage Slopes
• Active Flyback Diodes
• Full Output Protection and Diagnosis
• Thermal Warning and Shutdown
• Digital IO’s Compatible with 5 V and 3.3 V Microcontrollers
• NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
• These are Pb−Free Devices*
http://onsemi.com
PINOUT
32 31 30 29 28 27 26 25
GND 1
DI 2
CLK 3
NXT 4
DIR 5
ERR 6
SLA 7
8
24 GND
23 GND
22 MOTXN
21 MOTXN
20 MOTYN
19 MOTYN
18 GND
17 GND
9 10 11 12 13 14 15 16
PC20070309.2
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 26 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2009
1
December, 2009 − Rev. 2
Publication Order Number:
AMIS−30521/D