Stepper Motor Driver with Comprehensive Diagnostic Feedback and SLA Output

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Overview

The NCV70521 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 NCV70521 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 uses a proprietary PWM algorithm for reliable current control. The NCV70521 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 NCV70521 is ideally suited for general purpose stepper motor applications in the automotive environment.

  • Automotive headlight position
  • Flap/valve control in engine management
  • Folding displays
  • HVAC and LPG expansion valves
  • Dual H-Bridge for 2 phase stepper motors
  • Programmable peak-current up to 1.5 A using a 5-bit current DAC
  • On-chip current translator
  • SPI interface
  • Speed and load-angle output
  • 7 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 shut-down
  • Compatible with 5V and 3.3V microcontrollers

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CAD Models

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Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

ON Target

VM Min (V)

VM Max (V)

VCC Min (V)

VCC Max (V)

IO Max (A)

IO Peak Max (A)

Step Resolution

Control Type

Current Sense

Fault Detection

Pricing ($/Unit)

AMIS30521C5212RG

Last Shipments

CAD Model

Pb

A

H

P

NQFP-32

3

260

REEL

2500

N

6

40

4.75

5.25

1.6

1.6

1/32

SPI

Fully Integrated

Thermal

Price N/A

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