AMIS-30421 Datasheet, PDF (1/41 Pages) ON Semiconductor – Micro-Stepping Stepper Motor Bridge Controller

AMIS-30421
Micro-Stepping Stepper
Motor Bridge Controller
Introduction
The AMIS−30421 is a micro-stepping stepper motor bridge
controller for large current range bipolar applications. The chip
interfaces via a SPI interface with an external controller in order to
control 2 external power NMOS H−bridges. It has an on-chip voltage
regulator, current sensing, self adapting PWM controller and
pre-driver with smart slope control switching allowing the part to be
EMC compliant with industrial and automotive applications. It uses a
proprietary PWM algorithm for reliable current control.
The AMIS−30421 contains a current translation table and 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.
The AMIS−30421 is implemented in a mature technology, enabling
fast high voltage analog circuitry and multiple digital functionalities
on the same chip. The chip is fully compatible with automotive
voltage requirements.
The AMIS−30421 is easy to use and ideally suited for large current
stepper motor applications in the automotive, industrial, medical and
marine environment. With the on−chip voltage regulator it further
reduces the BOM for mechatronic stepper applications.
Key Features
• Dual H−Bridge Pre−Drivers for 2−Phase Stepper Motors
• Programmable Current via SPI
• On−chip Current Translator
• SPI Interface
• Speed and Load Angle Output
• 8 Step Modes from Full Step up to 64 Micro−Steps
• Current−Sense via Two External Sense Resistors
• PWM Current Control with Automatic Selection of Fast and Slow
Decay
• Low EMC PWM with Selectable Voltage Slopes
• Full Output Protection and Diagnosis
• Thermal Warning and Shutdown
• Compatible with 3.3 V Microcontrollers
• Integrated 3.3 V Regulator to Supply External Microcontroller
• Integrated Reset Function to Reset External Microcontroller
• These Devices are Pb−Free and are RoHS Compliant*
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
http://onsemi.com
1 44
QFN44
CASE 485BY
MARKING DIAGRAM
1
AMIS30421
0C421−001
AWLYYWWG
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW
= Work Week
G
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 40 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
1
October, 2011 − Rev. 0
Publication Order Number:
AMIS−30421/D