Gauge Driver Integrated Circuit

The 33991device is a single packaged, Serial Peripheral Interface (SPI) controlled, dual stepper 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 2-phase instrumentation stepper motor, similar to an MMT licensed AFIC 6405.

The device has many attractive features including:

? MMT-licensed two-phase stepper 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

? Linear 4500° 2

? Max pointer velocity of 400°

? Analog micro stepping (12 steps/degree of pointer movement)

? Pointer calibration and return to zero

? SPI controlled 16-bit word

? Calibratable Internal Clock

? Low Sleep mode current