Isolators enable high speed capability for servo motor control and high noise immunity

Available from Mouser, Silicon Labs Si838x isolated multi-channel input devices provide in a compact QSOP package 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 digital isolators provide compliance to IEC 61131-2 switch types 1, 2, or 3. The input interface of the device 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. The digital isolators support up to 2.5kVrms withstand voltage. These isolators also enable high speed capability of 1MHz (2Mbps) for servo motor control and a high noise immunity of 25kV/µs. Product options include parallel or serialised 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). It offers longer service life and dramatically higher reliability than opto-coupled input solutions.