The 33879 device is an 8-output hardware-configurable, high-side/low-side switch with 16-bit serial input control. Two of the outputs may be controlled directly via microprocessor for 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.
Freescale recommends the use of the "A" version devices for new designs.
Features
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Designed to Operate 5.5 V < VPWR < 26.5 V
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16-Bit SPI for Control and Fault Reporting, 3.3 V/5.0 V Compatible
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Outputs Are Current Limited (0.6 A to 1.2 A) to Drive Incandescent Lamps
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Output Voltage Clamp, +45 V (Low Side) and -20 V (High Side) During Inductive Switching
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On/Off Control of Open Load Detect Current (LED Application)
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Internal Reverse Battery Protection on VPWR
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Loss of Ground or Supply Will Not Energize Loads or Damage IC
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Maximum 5.0 µA IPWR Standby Current at 13 V VPWR
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RDS(ON) of 0.75 Ω at 25°C Typical
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Short Circuit Detect and Current Limit with Automatic Retry
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Independent Overtemperature Protection
Featured Documentation
Current Updates & Releases
- KIT33879AEKEVBE: Evaluation Kit - 33879, Configurable Octal Serial Switch with Open Load Detect Current Disable
Product Specifications
| Power Output Load - Current - Typ (A)(IL) | 0.35 |
| Power Output Load - Number of Channels | 8 |
| Power Output Load - Drain-to-Source On Resistance - Typ (Ohm)(RDS(ON)) | 0.75 |
| Power Output Load - Current Limit per Output - Min (A)(ILIM) | 1.2 |
| Load Supply Voltage - Min (V) | 0 |
| Load Supply Voltage - Max (V) | 26.5, 27.5 |
| Supply Voltage - Min (V) | 5.5 |
| Supply Voltage - Max (V) | 26.5, 27.5 |
| Interface and Input Control | Parallel, SPI |
| Ambient Operating Temperature (Ta) - Min (°C) | -40 |
| Ambient Operating Temperature (Ta) - Max (°C) | 125 |
