The 33977 is a Freescale Semiconductor production of a single gauge driver. It adopts Serial Peripheral Interface (SPI) control and integrates dual H-Bridge coil driver and associated control logic. The device can be used in measurement instrument systems that require distributed and flexible stepper motor gauge driving. The device also eases the transition from air core motors to stepper motors by emulating the damped air core pointer movement.
The MC33977 is a SPI‑controlled stepper‑motor gauge driver IC that integrates a dual H‑bridge and control logic for two‑phase instrumentation stepper motors. It provides pointer‑movement emulation, a state machine, and supports up to 4096 steady‑state positions.
The document includes functional descriptions, pin definitions, maximum and static/dynamic electrical characteristics, SPI interface timing, and ordering information, along with revision history and support contacts.
| Maximum Pointer Sweep | 340° |
|---|---|
| Maximum Pointer Velocity | 400°/s |
| Maximum Pointer Acceleration | 4500°/s² |
| Steady‑State Pointer Positions | 4096 |
| Operating Temperature Range | -40 °C to 125 °C |
The device can sweep up to 340 degrees.
The driver supports 4096 possible steady‑state positions.