AMIS30512C5122G Datasheet, PDF (1/30 Pages) ON Semiconductor – Micro-Stepping Motor Driver

AMIS-30512
Micro-Stepping Motor Driver
Introduction
The AMIS−30512 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. It has an on−chip
voltage regulator, reset−output and watchdog reset, able to supply
peripheral devices. The AMIS−30512 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. It is
using a proprietary PWM algorithm for reliable current control.
The AMIS−30512 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 AMIS−30512 is ideally suited for general−purpose stepper
motor applications in the automotive, industrial, medical, and marine
environment.
Key Features
• Dual H−Bridge for 2−phase Stepper Motors
• Programmable Peak−current up to 800 mA Using a 5−bit Current
DAC
• On−chip Current Translator
• SPI Interface
• Speed and Load Angle Output
• Seven 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 Fly−back Diodes
• Full Output Protection and Diagnosis
• Thermal Warning and Shutdown
• Compatible with 3.3 V Microcontrollers, 5 V Tolerant Inputs
• Integrated 5 V Regulator to Supply External Microcontroller
• Integrated Reset Function to Reset External Microcontroller
• Integrated Watchdog Function
http://onsemi.com
PIN ASSIGNMENT
DO
VDD
GND
DI
CLK
NXT
DIR
ERR
SLA
CPN
CPP
VCP
(Top View)
TSTO
POR/WD
VBB
MOTXP
GND
MOTXN
MOTYN
GND
MOTYP
VBB
CS
CLR
ORDERING INFORMATION
Device
AMIS30512
Package
SOIC 24
Shipping
Tape & Reel
© Semiconductor Components Industries, LLC, 2008
1
September, 2008 − Rev. 1
Publication Order Number:
AMIS−30512/D