EMC1815多路低电压遥控二极管温度传感器

电子工程师 2019-05-01 921

传感器

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描述

　　microchip公司的EMC1815是多路低电压遥控二极管温度传感器，具有±1℃的精度，工作温度-40℃到 +125℃，温度传感器分辨率0.125℃，SMBus/I2C兼容接口（高达400 kHz），工作电压1.62V-3.6V，主要用在温度敏感的存储，工业，低系统电压的IoT，手持设备和手持游戏机以及计算和食物存储。本文介绍了EMC1815系列主要特性，功能框图，系统框图以及EMC1833评估板主要特性，框图，电路图，材料清单和PCB设计图。

　　The EMC1812/13/14/15/33 devices monitor one internal diode and up to four externally-connectedtemperature diodes.

　　Thermal management is performed in cooperation with a host device. This consists of the host readingthe temperature data of both the external and internal temperature diodes of the EMC1812/13/14/15/33and using that data to manage thermal events or to control the speed of one or more fans.

　　This device family introduces rate of change temperature measurement with associated alerts. Thisprovides a preemptive system alert and another protective measurement layer to catch and managevariable system temperatures. Resistance Error Correction automatically eliminates the temperature errorcaused by series resistance. This feature allows for routing long traces and off-board connections withwires， if desired. Automatic beta compensation eliminates the need for substrate diode and transistorconfigurations.

　　The EMC1812/13/14/15/33 family has two levels of monitoring. The first provides a maskable ALERTsignal to the host when the measured temperatures exceed user programmable limits. This allows theEMC1812/13/14/15/33 to be used as an independent thermal watchdog to warn the host of temperaturehot spots without direct control by the host. The second level of monitoring provides a nonmaskableinterrupt on the THERM pin if the measured temperatures meet or exceed a second programmable limit.

　　The EMC1812 is a single-channel remote temperature sensor， while the EMC1813 is a dual-channelremote temperature sensor. The remote channels for this selection of devices can support substratediodes， discrete diode connected transistors， or CPU/GPU thermal diodes.

　　The EMC1814 supports anti-parallel diode （APD） only on one channel. For the channel that does notsupport APD functionality， substrate diodes， discrete diode-connected transistors or CPU/GPU thermaldiodes are supported. For the channel that supports APD， only discrete diode connected transistors maybe implemented. However， if APD is disabled on the EMC1814， then the channel that supports APD willbe functional with substrate diodes， discrete diode connected transistors and CPU/GPU thermal diodes.

　　The EMC1815 and EMC1833 support APD on all channels. When APD is enabled， the channels supportonly diode connected transistors. If APD is disabled， then the channels will support substrate transistors，discrete diode connected transistors and CPU/GPU thermal diodes.

　　The EMC1812/13/14/15/33 devices are high-accuracy， 2-wire （I2C） temperature sensors. The devicesmonitor up to five temperature channels. Advanced features， such as Resistance Error Correction （REC），Beta Compensation （to support CPU diodes requiring the BJT/Transistor model）， and rate of temperaturechange measurement combine to provide a robust solution for complex environmental monitoringapplications.

　　The Resistance Error Correction feature automatically eliminates the temperature error caused by seriesresistance， allowing for greater flexibility in routing thermal diodes. Beta compensation eliminatestemperature errors caused by low， variable beta transistors common in current fine geometry processors. Theautomatic beta detection feature determines the optimal sensor external diode/transistor settings. This freesup the user from providing unique sensor configurations for each temperature monitoring application. Theseadvanced features plus ±1℃ measurement accuracy for both external and internal diode temperaturesprovide a low-cost， highly flexible and accurate solution for critical temperature monitoring applications.

　　EMC1815系列主要特性：

　　• Measures Temperature Rate of Change Calculation with Preemptive Alert（s） Limits

　　• Up to Four External Temperature Monitors：

　　– 8 Lead Devices： ±1°C maximum accuracy （-20℃ to +105℃ TA， -40℃ to +125℃ TD）

　　– ±1.5℃ maximum accuracy （-40℃ to +125℃ TA， -40℃ to +125℃ TD）

　　–10 Lead Devices：±1℃ maximum accuracy （-20℃ to +125℃ TA， -40℃ to+125℃ TD）

　　– ±1.5℃ maximum accuracy （-40℃ to +125℃ TA， -40℃ to +125℃ TD）

　　• Internal Temperature Sensor：

　　– ±1℃ maximum accuracy， -40℃ to +125℃

　　• Temperature Sensor Resolution （Internal/External）： 0.125℃

　　• SMBus/I2C-Compatible Interface （up to 400 kHz）

　　– Programmable or fixed address options

　　• Configurable Alert Pins

　　• Operating Voltage： 1.62V to 3.6V

　　• Temperature Range： -40℃ to +125℃

　　• Other Features： Auto-Beta Compensation， Configurable Ideality Factor， Hottest Diode Compare，Resistance Error Correction

　　• Available in 8-Lead 2x2 mm WDFN and 10-Lead 2.5x2.0 mm VDFN Packages.

　　EMC1815系列应用：

　　• Temperature Sensitive Storage

　　• Industrial

　　• IoT for Low-System Voltage

　　• Portable Electronics

　　• Handheld Gaming

　　• Computing

　　• Food Storage

温度传感器

　　图1.EMC1815系列功能框图

温度传感器

　　图2.EMC1815系列系统框图

　　EMC1833评估板

　　The EMC1833 Evaluation Board is used to evaluate the EMC18XX family of remote diode temperature monitors. Users can now easily evaluate many of the integrated features of the EMC18XX device family. The device also has a on-board connector configured for an anti-parallel diode to allow for off-board temperature measurements. In addition， the evaluation board connects to PC through a USB interface.

　　Temperature can be data-logged using the Microchip Thermal Management Software Graphical User Interface （GUI）。

　　The board enables users to easily evaluate many custom programmable features such as Rate of Change， Temperature Alert Limit settings， Temperature Conversion Rate， Resistance Error Correction （REC） and Power Modes.

　　图3.EMC1833评估板（ADM00773）外形图：顶层

　　图4.EMC1833评估板（ADM00773）外形图：底层

　　EMC1833评估板（ADM00773）包括：

　　• EMC1833 Evaluation Board （ADM00773）

　　• USB cable

　　• 2N3904FS-ND transistor （TO-92 package）

　　• Important Information Sheet

温度传感器