TI SN65HVS882八路串行化方案

       TI公司的SN65HVS882是八路数字输入串行化器,用于工业自动化中高通路密度的数字输入模块.和电绝缘的隔离器一起.

        SN65HVS882在高压信号和低压控制信号间有完整的接口(SPI兼容),输入电压高达34V,同时输入信号有限流功能(-0.2mA 到5.2mA).广泛应用于工业自动化和压力控制的传感器输入,PC和PLC系统数字输入模块,分散的I/O模块以及运动控制系统.本文介绍了SN65HVS882的主要性能, 功能方框图, 数字输入模块应用电路图, 级联32路输入模块电路图和评估板SN65HVS882EVM电路图与元件布局图.

       The SN65HVS882 is an eight channel, digital-input serializer for high-channel density digital input modules in industrial automation. In combination with galvanic isolators the device completes the interface between the high voltage signals on the field-side and the low-voltage signals on the controller side. Input signals are current-limited and then validated by internal debounce filters.

       With the addition of a few external components, the input switching characteristics can be configured in accordance with IEC61131-2 for Type 1, 2, and 3 sensor switches.

       Upon the application of load and clock signals, input data is latched in parallel into the shift register and afterwards clocked out serially.

       Cascading of multiple devices is possible by connecting the serial output of the leading device with the serial input of the following device, enabling the design of high-channel count input modules. Multiple devices can be cascaded through a single serial port, reducing both the isolation channels and controller inputs required.

       Input status can be visually indicated via constant current LED outputs. The current limit on the inputs is set by a single external precision resistor. An integrated voltage regulator provides a 5-V output to supply low-power isolators. An on-chip temperature sensor provides diagnostic information for graceful shutdown and system safety.

       The SN65HVS882 is available in a 28-pin PWP PowerPAD™ package, allowing for efficient heat dissipation. The device is characterized for operation at temperatures from -40C to 125C.

       SN65HVS882主要特性:

       2Eight Inputs
       High Input Voltage – up to 34 V 
      Selectable Debounce Filters – 0 ms to 3 ms 
      yCsotuenmtsDigital Input Modules for
      Flexible Input Current Limit – 0.2 mA to 5.2 mA 
      Field Pins Protected to 15-kV HBM ESD
      Output Drivers for External Status LEDs
      Cascadable in Multiples of Eight Inputs
       SPI-Compatible Interface
      Regulated 5-V Output for External Isolator
      Over-Temperature Indicator

       SN65HVS882应用:

       Sensor Inputs for Industrial Automation and Process Control
High Channel Count Digital Input Modules for PC and PLC Systems
Decentralized I/O Modules
Motion Control Systems

图1.SN65HVS882功能方框图

图2.典型的数字输入模块应用电路图

                   图3.四个SN65HVS882级联32路输入模块电路图

       The SN65HVS882 evaluation module (EVM) supports the rapid, parametric evaluation of the
      SN65HVS882 digital input serializer. It is intended to be used with the SN65HVS882

                                图4.评估板SN65HVS882EVM电路图

                              图5.评估板SN65HVS882EVM元件布局图

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