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 Ω 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