AMI Semiconductor
AMIS-30622 Stepper Motordriver & Controller
with I2C Bus & Microstepping Features
Key Features
Motordriver
• Microstepping (1/2, 1/4, 1/8, 1/16)
• Programmable peak current up to 800mA
• 20kHz PWM current control
• Automatic selection of fast and slow decay mode
• Internal fly-back FETs
• Fully integrated current sense
• 8V-29V supply voltage
• Automotive compliant
• Full diagnostics and status information
• 5V reference voltage pin
Programmable Controller
• Position controller
• Configurable speeds, acceleration and deceleration
• Programmable hold current
• Programmable 'safe position'
• Customized default setting in non-volatile memory
(OTP)
• Movement/position sensor input
Protection and Diagnostics
• Over-current protection
• Under-voltage management
• Over-voltage protection
• High-temp warning and shutdown
• Low-temp warning
Serial Bus Interface
• 2-wire I2C serial interface
• 5V microcontroller compatible
• Up to 32 node addresses
• Detection of open and shorted motor coils
• Management of safe position
EMI Compatibility
• Power drivers with slope control
Product Description
The AMIS-30622 is a stepper motordriver with position
controller and control/diagnostics interface integrated in
one single chip.
motor types, positioning ranges and parameters for
speed, acceleration, deceleration, hold current, safe
position. Six OTP bytes are available to set default values,
and can be overruled by values programmed through the
I2C bus.
The product is ready to be connected as a peripheral
device to a microcontroller with minimal loading of the
microcontroller. The chip receives high level positioning
instructions through the I²C interface and subsequently
drives the motor coils until the desired position is reached.
The on-chip position controller is configurable for different
The AMIS-30622 acts as a slave on the serial bus and the
master can fetch specific status information like actual
position, error flags, etc. from each individual slave node.
Applications and Benefits
The AMIS-30622 is ideally suited for small positioning
applications. Target markets include automotive, industrial
equipment and building automation. Applications of
interest have typically multiple axes.
demands on the master microcontroller. The I2C bus
structure simplifies PCB track-layout and/or wiring
architectures.
Microstepping operation removes the design trade-off
between minimal operation speed and avoiding the risk of
noise and step loss due to resonance phenomena.
The high abstraction level of the product’s command set
reduces the load of the processor on the master side.
Scaling of the application towards number of axes is
straight-forward: hardware and software designs are
extended in a modular way, without severely affecting the
All these benefits result in reduced system cost and time-
to-market and improved technical performance.
