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Maxim MAX22192带诊断工业用八路数字输入解决方案

Maxim公司的MAX22192是IEC 61131-2兼容的集成了数字隔离的工业用数字输入器件,能把八路24V电流沉的工业输入转换成隔离串行SPI兼容输出,并和1.71V-5.5V逻辑电压接口.电流设定的电阻使得MAX22192可配置成Type 1,Type 2或Type 3输入.集成了现场电源监视器,超温监视器,用于误差检测的5位CRC代码发生,可配置输入电流限制从0.5mA到3.4mA,可选择输入故障滤波器,可以和现场其它器件组成菊花链,以共享隔离的SPI,采用1kΩ就可获得±8kV接触ESD保护和±15kV 空气隙ESD包护,采用1kΩ就可获得±1kV浪涌容差,工作温度-40℃到+125℃,主要用在工业自动化,可编逻辑控制器(PLC)和过程自动化.本文介绍了MAX22192主要优势和特性,隔离的八路数字输入框图和功能框图,四路Type2数字输入电路图,EMC保护电路图,典型工作电路图以及评估系统MAX22192EVKIT#主要特性,框图和工作模式图,电路图,材料清单和PCB设计图.

The MAX22192 is an IEC 61131-2 compliant industrial digital input device with integrated digital isolation. The MAX22192 translates eight, 24V current-sinking, indus­trial inputs to an isolated serialized SPI-compatible output that interfaces with 1.71V to 5.5V logic voltage. A current-setting resistor allows the MAX22192 to be configured for Type 1, Type 2, or Type 3 inputs. For proximity switches, the field-wiring is verified using the wire break feature. When wire break is enabled, the LFAULT output is assert­ed and a register flag set if the input current drops below the wire break threshold for more than 20ms. Additional diagnostics that assert LFAULT include: overtemperature protection, low 24V field supply, 24V fi

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