33977 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

33977

Single Gauge Driver

Freescale Semiconductor 

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION (OPTIONAL)

FUNCTIONAL INTERNAL BLOCK DESCRIPTION (OPTIONAL)

SPI

Logic

Internal

Reference

Under and

Overvoltage

Detect

Oscillator

H-Bridge

and Control

RTZ

Figure 6. Functional Internal 33977 Block Illustration

SERIAL PERIPHERAL INTERFACE (SPI)

This circuitry manages incoming messages and outgoing

status data.

OSCILLATOR

The internal oscillator generates the internal clock for all

timing critical features.

LOGIC

This design element includes internal logic including state

machines and message decoding.

INTERNAL REFERENCE

This design element is used for step value levels.

UNDER AND OVERVOLTAGE DETECTION

This design element detects when VPWR is out of the

normal operating range.

H-BRIDGE AND CONTROL

This circuitry contains the output coil drivers and the

multiplexers necessary for four quadrant operation and RTZ

sequencing. This circuitry is repeated for the Sine and Cosine

coils.

• Overtemperature — Each output includes an

overtemperature sensing circuit

• ILIM — Each output is current limited

RETURN TO ZERO (RTZ)

This circuitry outputs the voltage present on the non-driven

coil during RTZ operation.

Analog Integrated Circuit Device Data

Freescale Semiconductor

33977

11

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