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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 over-temperature protection.

Features

? Designed to operate 5.5 V ≤ VPWR ≤ 26.5 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 over-temperature protection