Skyworks Solutions Inc. Si838x Multi-Channel Digital Isolators

Skyworks Solutions Inc. Si838x Multi-Channel Digital Isolators provide eight channels of 24V digital field interface to either sinking or sourcing inputs with integrated safety rated isolation. In combination with a few external components, the Si838x Digital Isolators provide compliance to IEC 61131-2 switch types 1, 2, or 3. The input interface of the Si838x is based on proprietary CMOS-based LED emulator technology, which enables the bipolar capability (sinking or sourcing inputs) with no power supply required on the field side.

The output interface to the controller allows for low power operation with 2.5V operation capability. Si838x Digital Isolators support up to 2.5kV_rms withstand voltage. These devices also enable high-speed capability of 1MHz (2Mbps) for servo motor control and high noise immunity of 25kV/µs.

Product options include parallel or serialized outputs. The serial output option allows cascading capability for a total of 128 channels (16x Si838x). Other options include a de-bounce filter, either pre-programmed (in the parallel configuration) or programmable (on the serial out configuration). Si838x offers longer service life and dramatically higher reliability than optocoupler input solutions.

The Skyworks Solutions Inc. Si838x Multi-Channel Digital Isolators are available in a QSOP-20 RoHS-compliant package.

Features

Bipolar digital interface with 24V sinking or sourcing inputs
Eight total inputs in one package with up to four high-speed inputs
Safety rated integrated isolation of 2.5kVrms
2mA typical low input current
No V_DD required on field side
Status LEDs on parallel outputs
High electromagnetic immunity
Programmable debounce times of up to 100ms

Transient immunity of 25kV/μs
Flow-through output configuration with eight outputs
Option for SPI interface serialized outputs with daisy-chain capability
2.5V to 5.5V V_DD operation
-40°C to +125°C operating temperature range
Compliant to IEC 61131-2
- Type 1, 2, 3
QSOP-20 RoHS-compliant package

Applications

Programmable logic controllers
Industrial data acquisition
Distributed control systems

Computer Numeric Contol (CNC) machines
I/O modules
Motion control systems

Development Tools

Si838xISO-KIT PLC Input Isolator Evaluation Kit allows designers to quickly evaluate the functionality and capabilities of the Si838x by driving either 24V digital logic signals into the test-points labeled “EXT” or 2V to 5V signals into the remaining test-points. The board facilitates a quick evaluation of the key parameters of the Si838x. The kit also accommodates a direct connection to the designer’s end system.