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ПроизводительLinear Technology
СерияLTC2991
МодельLTC2991IMS#PBF

Octal I2C Voltage, Current, and Temperature Monitor

Datasheets

  • Скачать » Datasheet, PDF, 774 Кб, Файл закачен 25-09-2017
    LTC2991 - Octal I2C Voltage, Current, and Temperature Monitor
    Выписка из документа ↓
    LTC2991
    Octal I2C Voltage, Current,
    and Temperature Monitor
    FEATURES n n n n n n n n n n n n DESCRIPTION Measures Voltage, Current, Temperature
    Measures Four Remote Diode Temperatures
    0.7В°C (Typ) Accuracy, 0.06В°C Resolution
    1В°C (Typ) Internal Temperature Sensor
    Series Resistance Cancellation
    14-Bit ADC Measures Voltage/Current
    PWM Temperature Output
    3V to 5.5V Supply Operating Voltage
    Eight Selectable Addresses
    Internal 10ppm/В°C Voltage Reference
    V1 to V8 Inputs ESD Rated to 6kV HBM
    16-Lead MSOP Package APPLICATIONS n n n n n The LTCВ®2991 is used to monitor system temperatures,
    voltages and currents. Through the I2C serial interface, the
    eight monitors can individually measure supply voltages
    and can be paired for differential measurements of current sense resistors or temperature sensing transistors.
    Additional measurements include internal temperature
    and internal VCC. The internal 10ppm reference minimizes
    the number of supporting components and area required.
    Selectable address and configurable functionality give the
    LTC2991 flexibility to be incorporated in various systems ...

Цены

    ПоставщикПроизводительНаименованиеЦена
    ЭлитанLinear TechnologyLTC2991IMS579 руб.
    КремнийLTC2991IMS PBFпо запросу
    Подробнее об условиях поставки »

Корпус / Упаковка / Маркировка

КорпусMS-16
Код корпусаMS
Индекс корпуса05-08-1669

Параметры

ADC14-Bit
Количество каналов4
Demo BoardsDC1785B
Design ToolsLinduino File
Экспортный контрольнет
External Temp Sense Accuracy1.5 В°C
I/OSerial I2C
Internal Temp Sense Accuracy3.5 В°C
Isupply1.1 мА
MonitorsExternal V, External I, External Temperature, Internal Temperature
Рабочий диапазон температурот -40 до 85 °C
OutputDigital
Sensor TypeDiode, Internal
Диапазон напряжения питания3V to 5.5V

Экологический статус

RoHSСовместим

Application Notes

  • Скачать » Application Notes - AN137, PDF, 540 Кб, 20-09-2012
    Accurate Temperature Sensing with an External P-N Junction
    Many Linear Technology devices use an external PNP transistor to sense temperature. Common examples are LTC3880, LTC3883 and LTC2974. Accurate temperature sensing depends on proper PNP selection, layout, and device configuration. This application note reviews the theory of temperature sensing and gives practical advice on implementation.
    Выписка из документа ↓
    Application Note 137
    May 2012
    Accurate Temperature Sensing with an External P-N
    Junction
    Michael Jones
    Introduction Temperature Sensing Theory Many Linear Technology devices use an external PNP
    transistor to sense temperature. Common examples are
    LTC3880, LTC3883 and LTC2974. Accurate temperature
    sensing depends on proper PNP selection, layout, and
    device configuration. This application note reviews the
    theory of temperature sensing and gives practical advice
    on implementation. Linear Technology devices use an external bipolar transistor p-n junction to measure temperature. The relationship
    between forward voltage, current, and temperature is: Why should you worry about implementing temperature
    sensing? Can’t you just put the sensor near your inductor
    and lay out your circuit any way you want? Unfortunately,
    poor routing can sacrifice temperature measurement
    performance and compensation. The purpose of this application note is to allow you the opportunity to get it right
    the first time, so you don’t have to change the layout after
    your board is fabricated.
    Why Use Temperature Sensing?
    Some Linear Technology devices measure internal and
    external temperature. Internal temperature is used to
    protect the device by shutting down operation or locking ...

Design Notes

  • Скачать » Design Notes - DN510, PDF, 389 Кб, 30-11-2012
    System Monitor with Instrumentation-Grade Accuracy Used to Measure Relative Humidity
    Выписка из документа ↓
    System Monitor with Instrumentation-Grade Accuracy Used to
    Measure Relative Humidity
    Design Note 510
    Leo Chen
    Because much can be deduced about a physical system by measuring temperature, it is by far the most
    electronically measured physical parameter. Selecting
    a temperature sensor involves balancing accuracy
    requirements, durability, cost and compatibility with
    the measured medium. For instance, because of its low
    cost, a small-signal transistor such as the MMBT3904
    is an attractive choice for high volume or disposable
    sensing applications. Although such sensors are
    relatively simple, accurate temperature measurement
    requires sophisticated circuitry to cancel such effects
    as series resistance.
    The LTC2991 system monitor has this sophisticated
    circuitry built in—it can turn a small-signal transistor
    into an accurate temperature sensor. It not only measures remote diode temperature to В±1В°C accuracy, but
    it also measures its own supply voltage, single-ended
    voltages (0 to VCC) and differential voltages (В±325mV). While ostensibly designed for system monitor applications, the top shelf performance of the LTC2991 makes
    it suitable for instrumentation applications as well, such
    as the accurate psychrometer described here.
    A Psychrometer: Not Nearly as Ominous as ...

Статьи

  • Скачать » Статьи - LT Journal, PDF, 261 Кб, 19-04-2017
    Making Accurate Temperature Measurements with Devices with Different Ideality Factors
    Выписка из документа ↓
    Making Accurate Temperature Measurements with Devices
    with Different Ideality Factors
    Hamza Salman Afzal and Shuilin Tian The ability to accurately measure temperature is critical
    to the reliable operation of power systems. Accurate
    temperature data can reveal the instantaneous health of a
    system, and enable real-time protection functions such as
    thermal shutdown. For instance, significant rates of change
    in temperature can indicate increased power consumption.
    If a proper temperature feedback loop is implemented, this
    information can be used to reduce power consumption
    before temperatures escalate to dangerous levels.
    Perhaps the least expensive and most
    ubiquitous temperature sensor is a diode.
    A silicon p-n junction has a forward
    drop of approximately 700mV and a
    temperature coefficient of -2.2mV/C
    at room temperature. This sensitivity
    to temperature is exploited in many
    systems as a means of measuring
    temperature by simply biasing the diode
    with a constant current and measuring
    the resulting voltage (see Figure 1)
    This method has achieved wide acceptance ...
  • Скачать » Статьи - LT Journal, PDF, 1.7 Мб, 20-01-2012
    System Monitor with Instrumentation-Grade Accuracy Used to Measure Relative Humidity
    Выписка из документа ↓
    System Monitor with Instrumentation-Grade Accuracy Used
    to Measure Relative Humidity
    Leo Chen The LTC2991 is designed to measure supply voltages, currents and temperatures
    on large circuit boards when used in system monitor applications. It is also
    capable of delivering В±1В°C accuracy when using a 1-cent MMBT3904 transistor
    as a temperature sensor, making it suitable for many instrumentation applications.
    Temperature is the most measured physical parameter, with sensor selection a
    function of accuracy requirements, durability, cost and compatibility with the medium
    being measured. An inexpensive NPN transistor is an ideal sensor for applications
    calling for disposable sensors, or those that require a large number of sensors.
    A PSYCHROMETER: NOT NEARLY AS
    OMINOUS AS IT SOUNDS A psychrometer is a type of hygrometer,
    a device that measures relative humidity.
    It uses two thermometers, one dry (dry
    bulb) and one covered in a fabric saturated with distilled water (wet bulb). Air is
    passed over both thermometers, either by
    a fan or by swinging the instrument, as in
    a “sling psychrometer.” A psychrometric
    chart is then used to calculate humidity
    from the dry and wet bulb temperatures.
    Alternatively, a number of equations exist
    for this purpose. The following equations are used in testing this circuit. Figure 1 shows the LTC2991-based psychrometer. The two transistors provide
    the wet bulb and dry bulb temperature readings when connected to the ...

Модельный ряд

Серия: LTC2991 (4)

Классификация производителя

  • Signal Conditioning > Amplifiers > Current Sense Amplifiers
  • Monitor, Control and Protection > Power Monitors
  • Monitor, Control and Protection > Temperature Monitors > Digital Temperature Measurement Systems

Варианты написания:

LTC2991IMSPBF, LTC2991IMS PBF

На английском языке: Datasheet Linear Technology LTC2991IMS#PBF

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