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MAX31911 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX31911 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page MAX31911 Industrial, Octal, Digital Input Translator/Serializer 8 Maxim Integrated Basic Application Circuit Detailed Description Input Current Clamp The MAX31911 industrial interface serializer inputs (IN1–IN8) sense the state (on vs. off) of field sen- sors by monitoring both voltage and current flowing through the sensor output. The current sinking through these input pins rises linearly with input voltage until the limit set by the current clamp is reached. Any volt- age increase beyond this point does not increase the input current any further. The value of the current clamp is adjustable through an external resistor connected between the RIREF pin and GND. Pins RT1–RT8 must be connected directly to GND to provide a return path for the input current. The voltage and current at the IN1–IN8 input pins are compared against internally set references to deter- mine whether the sensor is on (logic 1) or off (logic 0). The trip points determining the on/off status of the sensor satisfy the requirements of IEC 61131-2 Type 1 and 3 switches. The device can also be configured to work as a Type 2 switch. Glitch Filter A digital glitch filter provides debouncing and filtering of noisy sensor signals. The time constant of this filter is programmable from 0ms to 3ms through the DB0 and DB1 pins. See Table 1 for debounce settings. To provide the digital glitch filter, the device checks that an input is stable for at least three clock cycles. The duration of a clock cycle is 1/3 of the selected debounce time. If the input is not stable for at least three clock cycles, the input change is not sent to the internal shift register. GND MODESEL DB1 DB0 5VOUT SIN CLK CS SOUT FAULT CLK CS SOUT FAULT ISOLATION JUMPERS TO 5VOUT AND GND C4 VDD_LOGIC RREF RINX R1 24V fIN1–8 RIREF C1 IN1–8 RT1–8 VCC24V MAX31911 NOTE: SEE FIGURE 1 FOR ADDITIONAL COMPONENTS NEEDED FOR EMC. |
Similar Part No. - MAX31911_13 |
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Similar Description - MAX31911_13 |
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