General Description

The CA-IS398x family of isolated octal digital inputs are optimized for industrial 24V digital input applications. All devices can be configured for Type 1, Type 2, or Type 3  inputs with a few external components and each channel can sink and source current. The isolation channels based on Chipanalog’s advanced capacitive isolation technology feature up to 2.5kVRMS isolation rating and ±300kV/μs typical CMTI (low-speed channels), provide high electromagnetic immunity, low propagation delay and low jitter.

The CA-IS398x devices operate over the supply range of  2.25V to 5.5V on logic side, no power supply is required on field side. The logic output level is set by supply voltage independently, easy to connect with 2.5V, 3.3V, and 5V controller interface. The CA-IS3980S industrial interface serializer translates, conditions and serializes the eight 24V  digital inputs to CMOS-compatible signals through the SPI  port required by microcontrollers; While the CA-IS398xP devices translate eight 24V industrial digital inputs to eight  CMOS-compatible parallel outputs. All devices provide isolated digital outputs and all digital inputs can be currentsinking or current sourcing industrial inputs (bidirectional inputs) from sensors and switches used in industrial,  process, and building automation. For robust operation in industrial environments, each input of the CA-IS398x with parallel outputs includes a glitch and debounce filters with fixed delay time; The CA-IS3980S features programmable debounce filters, allow flexible debouncing and filtering of sensor outputs based on the application. Also, for systems with more than eight sensor inputs, CA-IS3980S is capable of daisy-chaining multiple devices and have up to 128 inputs sharing the same isolated SPI interface. A simplified block diagram for the CA-IS398x is shown in the figure below.