Configurable Octal Serial Switch with Serial Peripheral Interface I/O

The 33880 device is an eight-output hardware configurable high-side/low side switch with 8-bit serial input control. Two of the outputs may be controlled directly via microprocessor for PWM applications. The 33880 incorporates SMARTMOS? technology, with CMOS logic, bipolar/MOS analog circuitry, and DMOS power MOSFETs. The 33880 controls various inductive or incandescent loads by directly interfacing with a microcontroller. The circuit’s innovative monitoring and protection features include very low standby currents, cascade fault reporting, output-specific diagnostics, and independent shutdown of output.

Features

? Designed to Operate 5.5 V < VPWR < 24.5 V

? 8-Bit SPI for Control and Fault Reporting, 3.3 V/5.0 V Compatible

? Outputs Are Current Limited (0.8 A to 2.0 A) to Drive Incandescent Lamps

? Output Voltage Clamp Is +45 V (Typical) (Low-Side Drive) and -20 V

(Typical) (High-Side Drive) During Inductive Switching

? Internal Reverse Battery Protection on VPWR

? Loss of Ground or Supply Will Not Energize Loads or Damage IC

? Maximum 5.0 μA IPWR Standby Current at 13 V VPWR up to 95°C

? RDS(ON) of 0.55 ? at 25°C Typical

? Short Circuit Detect and Current Limit with Automatic Retry

? Independent Overtemperature Protection

? 32-Pin SOIC Has Pins 8, 9, 24, and 25 Grounded for Thermal Performance