SA5778

General description

The Serial Triple Gauge Driver (STGD), is a single chip air core driver providing drive to one major gauge, and two minor gauges, for automotive applications such as Speedometer, Fuel, Temperature, Tachometer, Volts, and Oil pressure information display. The STGD operates in conjunction with a microcontroller receiving serial data inputs, and can provide status back to the microcontroller either serially or via a status line. The protocol is compatible with the Philips Single Gauge Driver (SGD) and Dual Gauge Driver (DGD). The STGD also includes a protected battery supply for external single Serial Gauge Drivers or Dual Gauge Drivers.

Features

• Major Gauge 10-bit resolution Drive provides 0.35? resolution
  - Sine/Cosine outputs for 360? operation
  - 0.2? accuracy typical throughout entire range
• Minor gauge drivers provide 0.35? resolution
  - 112? operation
  - 0.5? accuracy typical throughout entire range
• Serial Data Input
  - Supports interface from microcontrollers
  - Compatible with Philips SGD SA5775A and DGD SA5777A
• Serial Data Output
  - Permits the STGD to be wired in series using a common chip select to additional STGDs, SGDs, and DGDs
  - Permits fault status information to be returned to the microcontroller
• Over Voltage Protection, Over Temperature Protection and Low Standby Current Operation
  - Gauge drivers disabled when supply Voltage exceeds specified operating Voltage, protection to 40V.
  - Gauge drivers disabled when die temperature exceeds operating range
  - External switch may supply overVoltage protected battery supply to other devices operating off battery
• Thermally Enhanced SO-28 surface mount package

Applications

• Random sequential logic
• Synchronous up/down counters
• Shift registers
• Bidirectional data buffers
• Timing function generators
• System controllers/synchronizers
• Priority encoder/registers

Block diagrams/pinning

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