Si838x Isolated Multi-Channel Input Devices for PLC Applications

The Silicon Labs Si838x offers longer service life and dramatically higher reliability compared to competing opto-coupled input solutions.   The device provides eight channels of 24 V digital field interface in a single compact QSOP package to either sinking or sourcing inputs with integrated safety rated isolation. In combination with a few external components, this structure provides compliance to IEC 61131-2 switch types 1, 2, or 3. The input interface is built on our ground-breaking CMOS-based LED emulator technology, which enables the bipolar capability (sinking or sourcing inputs) to operate without a power supply required on the field side. The output interface to the controller allows for low power operation with 2.5 V operation capability. 

These devices utilize the Silicon Labs proprietary silicon isolation technology and support up to 2.5 kVrms withstand voltage. This technology enables high speed capability of 1 MHz (2 Mbps) for servo motor control, a high noise immunity of 25 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 the serial output option. Other options include a de-bounce filter, either pre-programmed (in the parallel configuration) or programmable (on the serial out configuration).  

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Features

  • 8x bipolar inputs, interface to 24 V digital field inputs
  • High speed channels of 2 Mbps for servo motor control
  • Integrated 2.5 kVrms safety rated isolation
  • 2.5 - 5.5 V VDD capability for low power controller interface
  • Serial (SPI) interface with controller
  • Capable of 16x Si838x daisy chain for 128 channels
  • IEC 61131-2 compliant, Type 1, 2, 3
  • De-bounce filter options


Si838x Product Matrix

Common Specifications

10 Kv Surge: No

Channel Type: Unidirectional

Reverse Channels: 0

Unidirectional Channels: 8

Integrated Pull-Up: No

Enable Control: No

Temperature Range Min (°C): -40

Temperature Range Max (°C): 125

Status
Devices
Part Number Data Sheet Evaluation Kit Max Propagation Delay Isolation Rating (kVrms) 10 kV Surge Enable Control Output Type Package Type Output Supply (V) Temperature Range (°C) Channel Type Unidirectional Channels Forward Channels Reverse Channels Max Data Rate (bps) Integrated Pull-Up AEC-Q100 Input Type
Si838xISO-Kit 4 µs 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 200 No Yes LED Emulator
Si838xISO-Kit 4 µs 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 200 No Yes LED Emulator
Si838xISO-Kit 4 µs 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 200 No Yes LED Emulator
Si838xISO-Kit 4 µs 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 200 No Yes LED Emulator
Si838xISO-Kit 4 µs 2.5 No No Serial QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 200 No Yes LED Emulator
Si838xISO-Kit 4 µs/100 ns 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 2000 No Yes LED Emulator
Si838xISO-Kit 4 µs/100 ns 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 2000 No Yes LED Emulator
Si838xISO-Kit 4 µs/100 ns 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 2000 No Yes LED Emulator
Si838xISO-Kit 4 µs/100 ns 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 2000 No Yes LED Emulator
Si838xISO-Kit 4 µs/100 ns 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 2000 No Yes LED Emulator
Si838xISO-Kit 4 µs/100 ns 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 2000 No Yes LED Emulator
Si838xISO-Kit 4 µs/100 ns 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 2000 No Yes LED Emulator
Si838xISO-Kit 4 µs/100 ns 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 2000 No Yes LED Emulator
Si838xISO-Kit 4 µs/100 ns 2.5 No No Parallel QSOP20 2.25 5.5 -40 125 Unidirectional 8 8 0 2000 No Yes LED Emulator
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