AMIS-30521 Datasheet, PDF (1/26 Pages) AMI SEMICONDUCTOR – Micro-stepping Motor Driver

AMIS-30521 Micro-stepping Motor Driver
Data Sheet
1.0 Introduction
The AMIS-30521 is a micro-stepping stepper motor driver for bipolar stepper motors. The chip is connected through I/O pins and an
SPI interface with an external microcontroller. The AMIS-30521 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-30521 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-30521 is ideally suited for general-purpose stepper motor applications in the automotive, industrial, medical, and marine
environment.
2.0 Key Features
• Dual H-Bridge for 2-phase stepper motors
• Programmable peak-current up to 1.6A 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 5V and 3.3V microcontrollers
3.0 Ordering information
Table 1: Ordering Information
Part No.
AMIS-30521 ANA
Package
NQFP-32 (7 x 7mm)
Peak Current
1600mA
Temp. Range
-40°C…..125°C
Ordering Code
Tubes
0C521-001-XTD
Ordering Code
Tapes
0C521-001-XTP
AMI Semiconductor – June 2007, M-20683-001
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