The 33879 device is an 8-output hardware configurable, high-side/low-side switch with 16-bit serial input control using the serial peripheral interface (SPI). Two of the outputs may be controlled directly via a microcontroller for pulse-width modulation (PWM) applications. The 33879 incorporates SMARTMOS technology, with CMOS logic, bipolar/MOS analog circuitry, and DMOS power MOSFETs. The 33879 controls various inductive, incandescent, or LED loads by directly interfacing with a microcontroller. The circuit’s innovative monitoring and protection features include very low standby currents, cascade fault reporting, internal + 45 V clamp voltage for low-side configuration, - 20 V high-side configuration, output specific diagnostics, and independent overtemperature protection.

Features

•Designed to operate 5.5 V < VPWR < 27.5 V

•16-bit SPI for control and fault reporting, 3.3 V / 5.0 V compatible

•Outputs are current limited (0.6 to 1.2 A) to drive incandescent lamps

•Output voltage clamp, + 45 V (low-side) and - 20 V (high-side) during inductive switching

•On/Off control of open load detect current (LED application)

•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

•RDS(ON) of 0.75 Ω at 25 °C typical

•Short-circuit detect and current limit with automatic retry

•Independent overtemperature protection

Applications

•Solenoids

•Relays

•Actuators

•Stepper motors

•Brush DC motors

•Incandescent lamps