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TI 公司的LMP91050是可編程的傳感器模擬前端（AFE），最適合用于溫度傳感器和非分散紅外（NDIR）檢測應(yīng)用。器件提供了傳感器和MCU間完整的通路，可編程增益從167V/V到7986V/V，工作電壓2.7V 到5.5V，(0.1 到10 Hz)噪音為 0.1μVRMS，最大增益漂移為100 ppm/℃，相位漂移為500ns，主要用在NDIR檢測，通風(fēng)控制，建筑物監(jiān)測，汽車電子的CO2艙控制和酒精檢測，GHG和氟利昂檢測平臺。本文介紹了LMP91050主要指標(biāo)和特性，方框圖，典型NDIR傳感應(yīng)用電路圖以及SPIO-4精密信號通路控制器板主要特性，方框圖，電路圖和PCB元件布局圖。 LMP91050是一個可編程的，集成傳感器模擬前端（AFE），并為熱電堆傳感器進(jìn)行了優(yōu)化，特別適用于NDIR應(yīng)用。該器件為傳感器和微控制器之間產(chǎn)生的輸出電壓（與熱電堆電壓成正比），提供了一個完整的信號路徑解決方案。 LMP91050的可編程性，使其能夠采用單一設(shè)計（可用于多個分立式解決方案）支持多個熱電堆傳感器。 LMP91050的功能包括，可編程增益放大器（PGA），“黑暗期”偏移刪除，和一個可調(diào)節(jié)的共同模式發(fā)生器（1.15V或2.59V），從而提高了輸出動態(tài)范圍。 該P(yáng)GA提供了一個低增益范圍（167V/V~1335V/V），加上1002V/V~7986V/V的高增益范圍，從而使用戶能更好地，更靈活地，來利用熱電堆。 
圖1 LMP91050方框圖
圖2 LMP91050典型NDIR傳感應(yīng)用電路圖 LMP91050主要指標(biāo) •可編程增益167V/V~7986V/V •低噪音（0.1Hz~10Hz）0.1μVRMS •增益漂移100 PPM/°C（最大值） •相位延遲漂移500ns（最大值） •電源電壓范圍2.7V~5.5V • LMP91050主要特性 •可編程增益放大器 • “暗信號”偏移刪除 •支持外部濾波 •通用模式發(fā)生器和8位DAC • 10引腳MSOP封裝 LMP91050應(yīng)用 • NDIR傳感 •需求控制通風(fēng) •建筑監(jiān)測 •二氧化碳機(jī)艙控制 - 汽車 •酒精檢測 - 汽車 •工業(yè)安全與保安 •溫室氣體氟利昂檢測平臺 SPIO-4精密信號通路控制器板 SPIO-4是國家半導(dǎo)體公司的幾個數(shù)字控制器（捕獲）板之一，可用于多個評估系統(tǒng)。這些軟件/硬件評估系統(tǒng)的目的是為了讓客戶能夠在實驗室環(huán)境中，輕松，準(zhǔn)確地評估國家半導(dǎo)體公司的信號路徑設(shè)備。在SPIO-4發(fā)行時，有兩個不同的評價系統(tǒng)軟件（GUI）采用板：WaveVision-5，和Sensor AFE。當(dāng)前出廠的版本是aveVision-5軟件。 除了控制器（捕獲）板（即SPIO-4），和評價GUI軟件（WaveVision5或Sensor AFE），評估體系的第三個基本要素是signalpath評估板（插在控制器板上）。此評估板通稱為“DUT板”。每個DUT板都帶有其自己的用戶指南，以記錄其特定的功能。 每個DUT板還配備了一些軟件（用戶在使用之前必須安裝）。在WaveVision-5 GUI的情況下，該軟件基本上是設(shè)備特定的模塊，它增加了對未來的設(shè)備評估板的支持。在AFE器件系列的情況下，評估板具有一個完整的，自定義傳感器AFE，專門與該設(shè)備配對。 WaveVision-5和Sensor AFE GUI 軟件有自己的用戶。指南文件描述了如何與GUI互動。本用戶指南只介紹了SPIO-4板。用戶僅在必要時參考。DUT用戶指南和GUI用戶指南描述了如何使用國家半導(dǎo)體的信號路徑評估板。 SPIO-4系統(tǒng)特性 •捕獲或供應(yīng)多信號路徑數(shù)據(jù)流，并通過USB2.0接口（兼容USB1.1），傳輸?shù)交赑C的應(yīng)用軟件，或從基于PC的應(yīng)用軟件中傳出
圖3 SPIO-4精密信號通路控制器板方框圖
圖4 SPIO-4精密信號通路控制器板電路圖（1） •支持免跳線，插件配置。 GUI自動發(fā)現(xiàn)連接DUT板，并加載相應(yīng)的軟件模塊。 •通過一個標(biāo)準(zhǔn)化的連接器（GPSI-16/GPSI-32），支持各種信號路徑評估板 • 8MBytes信號路徑數(shù)據(jù)存儲能力 • DUT接口可以是SPI，I2C或平行 •可以通過PC機(jī)USB，或外部電源供電 •愛特梅爾SAM3U的微控制器（ARM Cortex M3核） •為Atmel固件開發(fā)環(huán)境提供IDE接口 • USB 2.0端口 • USB供電 •最大串行時鐘速率80MHz •賽靈思XC6SLX16 FPGA •標(biāo)準(zhǔn)“GPSI-16”連接器，可連接 到許多國家半導(dǎo)體的精密信號路徑設(shè)備 Configurable AFE for Nondispersive Infrared (NDIR) Sensing Applications The LMP91050 is a programmable integrated Sensor Analog Front End (AFE) optimized for thermopile sensors, as typically used in NDIR applications. It provides a complete signal path solution between a sensor and microcontroller that generates an output voltage proportional to the thermopile voltage. The LMP91050 s programmability enables it to support multiple thermopile sensors with a single design as opposed to the multiple discrete solutions. The LMP91050 features a programmable gain amplifier (PGA), "dark phase" offset cancellation, and an adjustable common mode generator (1.15V or 2.59V) which increases output dynamic range. The PGA offers a low gain range of 167V/V to 1335V/V plus a high gain range of 1002V/V to 7986V/V which enables the user to utilize thermopiles with different sensitivities. LMP91050主要指標(biāo)： ■ Programmable gain 167V/V to 7986V/V ■ Low noise (0.1 to 10 Hz) 0.1μVRMS ■ Gain Drift 100 ppm/°C (max) ■ Phase Delay Drift 500ns (max) ■ Power supply voltage range 2.7V to 5.5V LMP91050主要特性： Programmable gain amplifier "Dark Signal" offset cancellation Supports external filtering Common mode generator and 8 bit DAC 10 pin MSOP package LMP91050應(yīng)用： NDIR sensing Demand control ventilation Building monitoring CO2 cabin control — Automotive Alcohol detection — Automotive Industrial safety and security GHG & Freons detection platforms
圖1。LMP91050方框圖
圖2。LMP91050典型NDIR傳感應(yīng)用電路圖 SPIO-4精密信號通路控制器板 The SPIO-4 is one of several National Semiconductor digital controller/capture boards that are used by multiple evaluation systems. The objective of these software/hardware evaluation systems is to allow our customers to easily and accurately evaluate National s signal-path devices in a lab setting. At the time of SPIO-4 s release, two different evaluation system software (GUIs) make use of this board: the WaveVision-5 and the Sensor AFE. The board ships with the current version of the WaveVision-5 software. In addition to the controller/capture board (i.e., the SPIO-4) and the evaluation GUI software (e.g.,WaveVision-5 or Sensor AFE), the third essential element of an evaluation system is the device or signalpath evaluation board that plugs into the controller board. This eval board is generically referred to as the “DUT board”. Each DUT board comes with its own Users Guide which documents its specific features. Each DUT board also comes with some software that the user must install before using it. In the case of the WaveVision-5 GUI, this software is essentially a device-specific module that adds support for the future device eval boards. In the case of Sensor AFE device family, the eval board comes with a complete, custom Sensor AFE that is specifically paired with that device. The WaveVision-5 and Sensor AFE GUI software have their own Users Guide documents that describe how to interact with the GUI. This User s Guide describes only the SPIO-4 board. The user is expected to refer to this guide only if necessary. The DUT Users Guide and the GUI Users Guide are the primary documents that describehow to work with a National signal-path evaluation board. SPIO-4系統(tǒng)特性： Captures or sources multiple signal-path data streams and transfers them to/from the PC based application software through a USB 2.0 connection (USB1.1 compatible). Supports jumper-less, plug-and-play configuration. The GUI automatically discovers the attached DUT board and loads the appropriate software module for it. Supports a wide variety of signal-path evaluation board through a standardized connector (GPSI-16/GPSI-32). Capable of storing up to 8MBytes of signal-path data. DUT interface can be SPI, I2C or parallel. Powered either by PC via USB or external supply Atmel SAM3U microcontroller (ARM Cortex M3 Core) Available IDE connector for Atmel firmware development environment USB 2.0 port USB-powered Maximum serial clock rate of 80 MHz Xilinx XC6SLX16 FPGA Standard `GPSI-16` connector that allows connection to many National precision signal-path devices
圖3。SPIO-4精密信號通路控制器板外形圖
圖4。SPIO-4精密信號通路控制器板方框圖
圖5。SPIO-4精密信號通路控制器板電路圖（1）
圖6。SPIO-4精密信號通路控制器板電路圖（2）
圖7。SPIO-4精密信號通路控制器板電路圖（3）
圖8。SPIO-4精密信號通路控制器板電路圖（4）
圖9。SPIO-4精密信號通路控制器板電路圖（5）
圖10。SPIO-4精密信號通路控制器板電路圖（6）
圖11。SPIO-4精密信號通路控制器板電路圖（7）
圖12。SPIO-4精密信號通路控制器板電路圖（8）
圖13。SPIO-4精密信號通路控制器板電路圖（9）
圖14。SPIO-4精密信號通路控制器板電路圖（10）
圖15。SPIO-4精密信號通路控制器板元件布局圖 詳情請見： 
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