Maxim MAX22199IEC 61131-2兼容工业数字输入器件解决方案

Maxim公司的MAX22199 IEC 61131-2兼容工业数字输入器件,能把8个24V电流吸入的工业输入转换成串行SPI兼容输出,和3V到5.5V逻辑兼容.它工作八个Type 1/Type 3数字输入或四个Type 2数字输入.器件提供诊断功能,包括热关断,24V欠压告警,24V丢失电压告警,以及SPI和CRC通信误差检测.所有故障能配置,采用FAULT引脚产生中断.为了在工业环境的鲁棒性工作,每个输入包括可编程的故障滤波器.每路的噪音滤波器能单独编程到50μs到20ms间的八个数值之一.MAX22199有4引脚SPI接口,此外,采用LATCH输入用来对多个器件的同步输入数据采样.器件直接工作在场激励电源(7V-65V),和3.3V或5V逻辑兼容,输入电流限制器精度为±11%,无能量的场边LED驱动器,具有负输入电压的低功耗,容错输入保护高达±40V.器件集成了场激励电源监视器,5比特CRC SPI误差检测.支持菊花链SPI和直接SPI,采用最小的1kΩ电阻可设计接触ESD保护±8kV和空气隙ESD保护±15kV,浪涌误差为±2kV.器件的工作温度为-40°C 到 +125°C.主要用在可编逻辑控制器(PLC),分布式控制系统,马达控制和建筑物自动化.本文介绍了MAX22199主要特性和优势,功能框图,应用电路和保护电路,以及评估板MAX22199 EVK主要特性,系统框图,电路图,材料清单和PCB设计图.

The MAX22199 is an IEC 61131-2 compliant industrial digital input device. The MAX22199 translates eight 24V current-sinking industrial inputs to a serialized SPI-compatible output that interfaces with 3V to 5.5V logic. It can operate as eight Type 1/Type 3 digital inputs or four Type 2 digital inputs. The device provides diagnostic functions, including thermal shutdown, 24V under volt­age alarm, 24V missing voltage alarm, and SPI and CRC communication error detection. All of the faults can be configured to generate an interrupt using the FAULT pin.

For robust operation in industrial environments, each input includes a programmable glitch filter. Noise filters on each channel can be independently programmed to one of eight values between 50μs and 20ms or filter bypass.

The MAX22199 has a 4-pin SPI interface and, in addition, uses the LATCH input for synchronizing input data sam­pling across multiple devices.

The MAX22199 field-side acce...