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 field supply missing, and CRC communication error.
For robust operation in industrial environments, each input includes a programmable glitch filter. The filter delay on each channel can be independently programmed to one of eight values between 50μs and 20ms, or filter bypass.
The MAX22192 has an isolated 4-pin SPI interface, and in addition uses isolated LLATCH input for synchronizing input data across multiple devices in parallel, and isolated LFAULT output for instantly alerting the host of any diagnostic issues. The digital signals with a name starting with L are logic-side signals, and the digital signals with a name starting with F are field-side signals.
The MAX22192 field-side accepts a single 7V to 65V supply to the VDD24F pin. When powered by the field supply, the MAX22192 generates a 3.3V output on the VDD3F pin from an integrated LDO regulator, which can provide up to 25mA of current for external loads in addition to powering the MAX22192. Alternatively, the MAX22192 can be powered from a 3.0V to 5.5V supply connected to the VDD3F pin. The logic-side of the MAX22192 is powered from a single 1.71V to 5.5V supply to the VDDL pin to interface with 1.8V, 3.3V, or 5V logic levels.
The MAX22192 has an isolation rating of 600VRMS for 60 seconds and is available in a 70-pin GQFN package with 2.3mm clearance and creepage. The package material has a minimum comparative tracking index (CTI) of 600V, which gives it a group I rating in creepage tables.
High Integration Reduces BOM Count and Board Space Eight Input Channels with Serializer
Integrated Isolation of 600VRMS for 60s (VISO)
Operates Directly from Field Supply (7V to 65V)
Compatible with 1.8V, 3.3V or 5V Logic
6mm x 10mm GQFN Package
Reduced Power and Heat Dissipation Accurate Input-Current Limiters
Energyless Field-Side LED Drivers
Fault Tolerant with Built-In Diagnostics Input Protection to ±40V with Low-Input Leakage Current
Integrated Field-Supply Voltage Monitors
Integrated Overtemperature Monitors
5-Bit CRC Code Generation for Error Detection
Configurability Enables a Wide Range of Applications Configurable IEC 61131-2 Type 1, 2, 3 Inputs
Configurable Input Current-Limiting from 0.5mA to 3.4mA
Selectable Input Glitch Filter
Capable of Daisy-Chaining Other Field-Side Devices Sharing Isolated SPI
Robust Design ±8kV Contact ESD and ±15kV Air-Gap ESD Using Minimum 1kΩ Resistor
±1kV Surge Tolerant Using Minimum 1kΩ Resistor
-40℃ to +125℃ Ambient Operating Temperature
Programmable Logic Controllers
UL According to UL1577
cUL According to CSA Bulletin 5A
The MAX22192 evaluation system (EV system) provides the hardware and software necessary to evaluate the MAX22192 octal industrial digital input device with diagnostic features and digital isolation. The MAX22192 evaluation kit (MAX22192EVKIT#) has Pmod™ compatible connector for SPI communication, but does not include the USB2PMB2# adapter board. The EV system (MAX22192EVSYS#) includes both the MAX22192EVKIT# and the USB2PMB2# adapter board that receives commands from a PC through the USB port to create an SPI interface for communication between the software and the MAX22192 on the EV kit.
The EV system includes a graphical user interface (GUI) that provides communication between the target device and the PC. The MAX22192 EV kit has a MAX22192 device (U1) and a MAX22190 device (U2), which is an octal industrial digital input device without digital isolation. The EV kit can be configured to operate in multiple modes:
1) Single-Channel Mode: The USB2PMB2# adapter communicates with either U1 or U2 on the EV kit, depending on which channel is preferred and selected using the on-board jumpers.
2) Independent Slave Mode: The USB2PMB2# adapter uses two chip-select signals (CS1 and CS2) to control each chip through a single connector/GUI interface.
3) Daisy-Chain Mode: The USB2PMB2# adapter communicates with both U1 and U2 in SPI daisy-chain mode. The OSDI from U1 connects to SDI of U2, and the SDO of U2 connects to FSDI of U1. Both U1 and U2 are controlled from a single SPI interface.
MAX22192EVKIT#, including the MAX22192ARC+
USB2PMB2# Adapter Board
Easy Evaluation of the MAX22192
EV Kit Logic-Side is USB-Powered
Configured for IEC 61131-2 Type 1 and 3, and Type 2
Independent Slave or Daisy-Chain SPI Interface
Galvanic Isolation using MAX22192 and MAX12931
Robust Design ±1kV Surge Tolerant Line-to-Ground
Windows® 10, Windows 8.1, Windows 7, and Windows XP® Compatible Software
Fully Assembled and Tested
Proven PCB Layout