INTRODUCTION

The AMIS−30624/NCV70624 is a single−chip micro−stepping

motor driver with a position controller and control/diagnostic

interface. It is ready to build intelligent peripheral systems where up to

32 drivers can be connected to one I2C master. This significantly

reduces system complexity.

The chip receives positioning instructions through the bus and

subsequently drives the stator coils so the two−phase stepper motor

moves to the desired position. The on−chip position controller is

configurable (OTP or RAM) for different motor types, positioning

ranges and parameters for speed, acceleration and deceleration.

Micro−stepping allows silent motor operation and increased

positioning resolution. The advanced motion qualification mode

enables verification of the complete mechanical system in function of

the selected motion parameters. The AMIS−30624/NCV70624 can

easily be connected to an I2C bus where the I2C master can fetch

specific status information like actual position, error flags, etc. from

each individual slave node.

An integrated sensorless step−loss detection prevents the positioner

from loosing steps and stops the motor when running into stall. This

enables silent, yet accurate position calibrations during a referencing

run and allows semi−closed loop operation when approaching the

mechanical end−stops.

The chip is implemented in I2T100 technology, enabling both high

voltage analog circuitry and digital functionality on the same chip.

The NCV70624 is fully compatible with the automotive voltage

requirements.

PRODUCT FEATURES

Motor Driver

 Micro−Stepping Technology

 Sensorless Step−Loss Detection

 Peak Current Up to 800 mA

 Fixed Frequency PWM Current−Control

 Selectable PWM Frequency

 Automatic Selection of Fast and Slow Decay Mode

 No external Fly−back Diodes Required

 14 V/24 V Compliant

 Motion Qualification Mode (Note 1)

Controller with RAM and OTP Memory

 Position Controller

 Configurable Speeds and Acceleration

 Input to Connect Optional Motion Switch

I2C Interface

 Bi−Directional 2−Wire Bus for Inter IC Control

 Field Programmable Node Addresses

 Full Diagnostics and Status Information

Protection

 Overcurrent Protection

 Undervoltage Management

 Open−circuit Detection

 High Temperature Warning and Management

 Low Temperature Flag

EMI Compatibility

 High Voltage Outputs with Slope Control

Patents

 US 7,271,993

 US 7,288,956

 This is a Pb−Free Device

 NCV Prefix for Automotive and Other Applications

Requiring Site and Control Changes