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HI-8425PCI Datasheet(PDF) 1 Page - Holt Integrated Circuits |
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HI-8425PCI Datasheet(HTML) 1 Page - Holt Integrated Circuits |
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1 / 18 page  HI-8425, HI-8426 8-Channel, Ground /Open, or Supply / Open Sensor 4-channel 200 mA Ground / Open Driver GENERAL DESCRIPTION FEATURES The HI-8425 is a combined 8-channel discrete-to-digital sensor and quad low side driver fabricated with Silicon-on- Insulator (SOI) technology for robust latch-up free operation. Sense detection can either be GND/Open or Supply/Open as configured by the SNSE_SEL pin. Supply/Open sensing is also referred to as 28V/Open sensing. The sensing circuit window comparator thresholds can be fixed at the internal programmed values or can be set externally at the HI_SET and LO_SET pins, as selected by the pin. The digital SENSE outputs can be tri- stated by taking the pin high. The HI-8425 also offers four low side switches each capable of sinking 200 mA of current. Each switch transistor is controlled by its own digital input pin and is fully fault protected. Over-current conditions, such as a short circuit, are detected and inhibited while signaling the fault condition at the corresponding logic output. These four FAULT outputs are also available in a combined OR output. The outputs are fully protected from transients when driving relays. The HI-8426 puts all of the features of the HI-8425 except the individual Fault Detection Outputs, Tri-state pin selection and fixed internal thresholds into a 32-pin Chip Scale Package (QFN) which measures only 5mm x 5mm. Interface to the digital subsystem is simple CMOS logic inputs and outputs. The logic pins are compatible with 5V or 3.3V logic allowing direct connection to a wide range of microcontrollers or FPGAs. THS_SEL OE All sense inputs are internally lightning protected to DO160G, Section 22, Cat AZ, BZ and ZZ without external components. · · · · · · Robust CMOS Silicon-on-Insulator (SOI) technology 8-channel Selectable Sense Operation, GND/Open or Supply/Open Selectable Thresholds and Hysteresis Sense Detection Range 3V to 22V Logic Operation from 3.0V to 5.5V Lightning Protected Sense Inputs August 2013 SENSE0 - 1 1-2 2-3 3-4 4-5 5-6 6-7 7-8 SENSE SENSE SENSE SENSE SENSE SENSE SENSE 24 - DSEL_3 23-DRV0 22-DRV1 21 - GND 20 - DRV_2 19 - DRV_3 18 - FAULT_OR 17 - GND HI-8426PCI HI-8426PCT 32 Pin Plastic 5mm x 5mm Chip-scale package (QFN) (See page 15 for leaded QFP package options) PIN CONFIGURATIONS VWET - 1 SENSE0 - 2 SENSE1 - 3 SENSE2 - 4 SENSE3 - 5 SENSE4 - 6 SENSE5 - 7 SENSE6 - 8 SENSE7 - 9 -10 OE 30 - 29 - FAULT_0 28 - DRV_0 27 - DRV_1 26 - FAULT_1 25 - GND 24 - FAULT_2 23 - DRV_2 22 - DRV_3 21 - FAULT_3 HI-8425PCI HI-8425PCT 40 Pin Plastic 6mm x 6mm Chip-scale package (QFN) APPLICATIONS · · · · · · Airbus ABD0100H compliant 4 Low-Side 200 mA drivers 4.5 Ohm On Resistance Over-Current Fault Detection Signaled by Logic Output Max Power Dissipation Automatically Limited by Fault Protection Diode Clamps for Discharging Inductive Loads HOLT INTEGRATED CIRCUITS (DS8425 Rev. C) 08/13 www.holtic.com · · · · Avionics Discrete to Digital Sensing Relay Driver Lamp driver Discrete Signaling |
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