Dual Gauge Driver Integrated Circuit with Improved Damping Algorithms

This 33970 is a single-packaged, Serial Peripheral Interface (SPI) controlled, dual step motor gauge driver integrated circuit (IC). This monolithic IC consists of four dual output H-Bridge coil drivers and the associated control logic. Each pair of H-Bridge drivers is used to automatically control the speed, direction, and magnitude of current through the two coils of a two-phase instrumentation step motor, similar to an MMT-licensed AFIC 6405.

Features

• MMT-Licensed Two-Phase Step Motor Compatible

• Minimal Processor Overhead Required

• Fully Integrated Pointer Movement and Position State Machine with Air Core Movement Emulation

• 4096 Possible Steady State Pointer Positions

• 340° Maximum Pointer Sweep

• Fixed Maximum Acceleration and Deceleration of 4500°/s2

• Maximum Pointer Velocity of 400°/s

• Analog Microstepping (12 Steps/Degree of Pointer Movement)

• Pointer Calibration and Return to Zero

• SPI-Controlled 16-Bit Word

• Calibratable Internal Clock

• Low Sleep Mode Current

• Backward Compatible with MC33991

• Improved Pointer Movement, Diagnostics, and Return to Zero (RTZ)

• Pb-Free Packaging Designated by Suffix Code EG