MOTOROLA MC33991 User Manual

ANALOG
PRODUCTS

MC33991
FACT SHEET

APPLICATIONS

• Driving Low-Power
2-Phase Bipolar
Stepper Motors

• Automotive Gauge
Clusters

• Mirror Positioning

• Headlight Leveling

• Tachograph

• Drivers for
Multimedia
Applications

• Digital Clocks

SPECIAL FUNCTION

ACCESSORY CONTROL

CUSTOMER BENEFITS

• Simple system design with direct interfacing to a
microprocessor

• Low system cost, minimal component count, and
simple circuit hook-up

• Full management of movement of two motors

• Low VDDcurrent consumption

• Analog microstepping for low EMI

• Fully protected against faulted motors

Performance Typical Values

Operating Voltage 9.0 – 26V
Motor Drivers 2
Drive Current ± 30 mA
Control SPI
Operating Temp -40°C ≤ TA≤ 125°C

33991 GAUGE DRIVER INTEGRATED CIRCUIT (GDIC)

The 33991 is a Serial Peripheral Interface (SPI) controlled, dual stepper motor driver IC. This monolithic
IC consists of four dual output H-Bridge coil drivers and their associated control and management logic.
Each pair of H-Bridge drivers automatically controls the speed, direction, and magnitude of current
through the two coils of a two-phase instrumentation stepper motor, similar to an MMT-licensed
AFIC 6405.

A special patent-pending circuit detects motor stall accurately and allows simple end-stop detection.
The GDIC is ideal for use in instrumentation systems that require distributed and flexible stepper motor

gauge driving. The device simplifies the use of stepper motors by including all the logic required to
manage the motion of the stepper without requiring significant processor overhead. SPI communica­tions are used to request a motor position and the IC completely manages the acceleration, stepping,
and deceleration of the motor to arrive correctly at the requested position. Updated requests can be
received at any time and the logic correctly acts upon the latest position request. Both motors can be
controlled and driven independently.

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5.0 V

Regulator

MCU

Simplified Application Diagram

V

PWR

33991

V

PWR

V

DD

RT
RS
CS

SCLK
SI
SO

SIN1+

SIN1-

COS1+

COS1­SIN2+

SIN2-

COS2+

COS2-

GND

Motor 1

Motor 2

QUESTIONS

• Do you need to driver small stepper motors with a simple microcontroller?

• Do you have power supply constraints?

• Are you looking for a simple interface to the motor controller?

• Do you need to detect motor end-stop stalling?

• Do you want to eliminate production calibration of motor positions?

FEATURES

• Compatible with MMT-licensed two-phase stepper motors

• Minimal processor overhead required

• Fully integrated pointer movement and position state machine with air core
movement emulation

• Analog microstepping with positioning to any microstep

• Designed for a constant acceleration of 4500°/s2and maximum pointer velocity
of 400°/s

• Pointer calibration by return to zero

• 16-bit word SPI-controlled

• Calibrate-able internal clock

• Low sleep mode current

• Internal regulator to minimize IDD consumption

• Additional devices available for comparison in Analog Selector Guide SG1002/D

How to reach us:
USA/EUROPE/Locations Not Listed: Motorola Literature Distribution;

P.O. Box 5405, Denver, Colorado 80217
1–303–675–2140 or 1–800–441–2447

JAPAN:Motorola Japan Ltd.; SPS, Technical Information Center,
3–20–1, Minami–Azabu. Minato–ku, Tokyo 106–8573 Japan
81–3–3440–3569

ASIA/PACIFIC:Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre,
2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong
852–26668334

Technical Information Center: 1–800–521–6274
HOME PAGE:http://www.motorola.com/semiconductors

MC33991FS/D
Rev. 0

MOTOROLA and the Stylized M Logo are registered in the U.S. Patent & Trademark Office.
All other product or service names are the property of their respective owners.
© Motorola, Inc. 2002

Ordering Ship Motorola
Information Package Method Part Number

24 SOICW Rail **33991DW

T/R **33991DWR2
Data Sheet Order Number MC33991/D
Contact Sales for Evaluation Kit Availability
**Prefix Index:

PC = Eng Samples; XC = In Qual; MC = Production

Shut Status

Protection Detect Limiting Down Reporting

Over Voltage • • •
Under Voltage • •
Over Current/SC • • • •
Over Temperature • •
SPI Framing Error •

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SUNSTAR自动化 http://www.sensor-ic.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]