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