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[原创] Maxim MAX22192集成数字隔离八路数字输入器件解决方案

关键词:电源管理 PLC 工业自动化 过程自动化 MAX22192

时间:2018-12-03 11:13:08       作者:Maxim       来源:中电网

Maxim公司的MAX22192是IEC 61131-2兼容的集成了数字隔离的八路工业数字输入器件,隔离电压600VRMS 60秒,直接从现场供电(7V-65V)工作,和1.8V,3.3V或5V逻辑兼容,±8kV接触ESD和±15kV空气隙ESD,采用1kΩ电阻有±1kV耐浪涌,工作温度-40℃ 到 +125℃,主要用在可编逻辑控制器,工业自动化,过程自动化.本文介绍了MAX22192主要优势和特性,绝缘八数字输入框图和功能框图,应用框图以及评估系统MAX22192 EVS主要特性,系统框图,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.

MAX22192主要优势和特性:

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
Wire-Break Detection
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

MAX22192应用:

Programmable Logic Controllers
Industrial Automation
Process Automation
Safety Regulatory Approvals (Pending)
UL According to UL1577
cUL According to CSA Bulletin 5A

图1.MAX22192绝缘八数字输入框图

图2.MAX22192功能框图

图3.MAX22192 4路Type 2数字输入框图

图4.MAX22192由VDD3F,VDD24F未连接,EXTVM禁用的场侧供电框图

图5.MAX22192典型EMC保护电路

图6.MAX22192典型工作电路(1)

图7.MAX22192典型工作电路(2)

评估系统MAX22192 EVS

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 (EV kit) has Pmod™ compatible connec­tor for SPI communication. The EV system includes 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.

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.

评估系统MAX22192 EVS包括:

MAX22192EVKIT#, including the MAX22192ARC+
USB2PMB2# Adapter Board
Micro-USB Cable

评估系统MAX22192 EVS主要特性:

Easy Evaluation of the MAX22192
EV Kit Logic-Side is USB-Powered
Configured for IEC 61131-2 Type 1, 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
RoHS Compliant

图8.评估板MAX22192 EVK外形图

图9.USB2PMB2适配器板外形图

图10.评估系统MAX22192 EVS外形图

图11.评估系统MAX22192 EVS系统框图

图12.评估系统MAX22192 EVS工作模式图

图13.评估系统MAX22192 EVS电路图(1)

图14.评估系统MAX22192 EVS电路图(2)

图15.评估系统MAX22192 EVS电路图(3)
评估系统MAX22192 EVS材料清单:


图16.评估系统MAX22192 EVS PCB设计图(1):顶层丝印

图17.评估系统MAX22192 EVS PCB设计图(2):顶层

图18.评估系统MAX22192 EVS PCB设计图(3):内层2

图19.评估系统MAX22192 EVS PCB设计图(4):内层3

图20.评估系统MAX22192 EVS PCB设计图(5):内层4

图21.评估系统MAX22192 EVS PCB设计图(6):内层5

图22.评估系统MAX22192 EVS PCB设计图(7):底层

图23.评估系统MAX22192 EVS PCB设计图(8):底层丝印
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX22192.pdf
https://datasheets.maximintegrated.com/en/ds/MAX22192EVKIT-MAX22192EVSYS.pdf
MAX22192.pdf
MAX22192EVKIT-MAX22192EVSYS.pdf

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