ایزولاتور ایزولاتور دیجیتال

Product Attributes

Introduction

The Si838x provides eight channels for 24 V digital field interface to either sinking or sourcing inputs with integrated safety rated isolation. In combination with a few external components, this provides compliance to IEC 61131-2 switch types 1, 2, or 3. The input interface is based on Silicon Labs' ground-breaking CMOS based LED emulator technology which enables the bipolar capability (sinking or sourcing inputs) with no VDD required on the field side. The output interface to the controller allows for low power operation with 2.25 V operation capability. These products utilize Silicon Laboratories' proprietary silicon isolation technology, supporting up to 2.5 kV RMS withstand voltage. This technology enables high CMTI (50 kV/μs), lower prop delays and skew, reduced variation with temperature and age, and tighter part-to-part matching. Product options include parallel or serialized outputs. Cascading capability for a total of 128 channels (16x Si838x) is possible with serial output option. The Si838x offers longer service life and dramatically higher reliability compared to opto-coupled input solutions.

Features

• Bipolar digital interface with 24 V sinking or sourcing inputs
• Eight total inputs in one package
• High data rates of up to 2 Mbps
• Safety rated integrated isolation of 2.5 kVrms
• Low input current of 1 mA typ
• No VDD required on field side
• Status LEDs on parallel outputs
• High electromagnetic immunity
• Programmable debounce times of up to 100 ms
• Transient immunity of 50 kV/μs
• Flow-through output configuration with eight outputs
• Option for SPI interface serialized outputs with daisy-chain capability
• Wide 2.25 to 5.5 V VDD operation
• Wide operating temperature range: –40 to +125 °C
• Compliant to IEC 61131-2: Type 1, 2, 3
• RoHS-compliant packages: QSOP-20

Applications

• Programmable logic controllers
• Industrial data acquisition
• Distributed control systems
• CNC machines
• I/O modules
• Motion control systems