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