How to improve speed and reliability of isolated digital inputs
Digital Input receivers are used in AC and servo motor control to interface various 24-V signals to the control module of the drive. These signals include inputs from field sensors and switches, position and speed feedback encoded as 24-V signals, clock or PWM inputs for speed control, and emergency stop signals, such as Safe Torque Off (STO).
By Anant Kamath, Systems Engineer, Isolation Products, Interface Group
Isolation is used to manage ground potential differences. Texas Instruments' ISO1211 and ISO1212 devices are high-speed isolated digital input receivers with integrated current limit, voltage comparator with hysteresis and reverse polarity protection.
The ISO1211 can be used for channel-to-channel isolation and the ISO1212 is ideal for multichannel designs. Figure 2 shows the implementation of one channel of a Digital Input receiver with ISO1211.
The resistor RSENSE controls the current limit, and the resistor RTHR, the voltage transition thresholds. This allows the systems designer to independently adjust these parameters. The ISO121x can reduce power dissipation by a factor of 5x compared to traditional approaches.
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