CXHA3181是一个精确的数字温度计，它可以报告2个远程传感器和它自己的软件包的温度。远程传感器是二极管连接晶体管，通常是一种低成本、易于安装的2N3904 NPN型，取代了传统的热敏电阻或热电偶。远程精度为±1°C，无需校准。它还具有内置的噪声过滤功能，用于遥感器测量二极管温度。远程通道还可以测量其他集成电路（如微处理器）的芯片温度，这些集成电路包含一个片上二极管连接的晶体管。2线串行接口接受标准系统管理总线（SMBus）的写入字节、读取字节、发送字节和接收字节命令，以编程报警阈值和读取温度数据。数据格式为11位加号，每一位对应0.125°C，采用两位补码格式。测量可以自动和自主地进行，转换率由用户编程或编程为在单次拍摄模式下操作。可调速率允许用户控制电源电流消耗。CXHA3181有一个小的，10针MSOP表面安装包。
三个通道：测量两个远程和一个本地温度
用晶体管模型测量热二极管
支持单核、双核和四核CPU应用
无需校准
·内置遥感器噪音抑制器
SMBus 2线串行接口
可编程欠温/超温报警
支持SMBus警报响应
“精度：±1°C（+60°C至+100°C，远程）±3°C（+60°C至+100°C，本地）
·转换期间320μA（典型）平均电源电流
用晶体管模型测量热二极管
支持45nm、65nm和90nm CPU热二极管
+3V至+5.5V电源范围
小型8-铅标准操作规程、MSOP和TDFN包
“使用偏移移位法进行高达160°C的远程温度测量（参见“测量高于127°C的远程温度”一节）
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[ CXHA3181 ]
目录
7.相关产品
产品概述 返回TOP
The CXHA3181 is a precise digital thermometer that reports the temperature of 2 remote sensors and its own package. The remote sensors are diodeconnected transistors typically a low-cost, easily mounted 2N3904 NPN type that replace conventional thermistors or thermocouples. Remote accuracy is ±1°C with no calibration needed. It also has a build-in noise filtering function in remote sensor measuring the diode temperature. The remote channel can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor. The 2-wire serial interface accepts standard System Management Bus (SMBus) Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read temperature data. The data format is 11bits plus sign, with each bit corresponding to 0.125°C, in two’s-complement format. Measurements can be done automatically and autonomously, with the conversion rate programmed by the user or programmed to operate in a single-shot mode. The adjustable rate allows the user to control the supply current drain. The CXHA3181 is available in a small, 10-pin MSOP surface-mount package.
产品特点 返回TOP
„ Three Channels: Measures Two Remote and One Local Temperatures
„ Measure Thermal Diode with a Transistor Model
„ Support Single-Core, Dual-Core and Quad-Core CPU Application
„ No Calibration Required
„ Built-in Noise-Buster for Remote Sensor
„ SMBus 2-Wire Serial Interface
„ Programmable Under/Overtemperature Alarms
„ Supports SMBus Alert Response
„ Accuracy: ±1°C (+60°C to +100°C, remote) ±3°C (+60°C to + 100°C, local)
„ 320μA (typ) Average Supply Current During Conversion
„ Measure Thermal Diode with Transistor Model
„ Support 45nm, 65nm and 90nm CPU thermal diode
„ +3V to +5.5V Supply Range
„ Small 8-Lead SOP , MSOP and TDFN Package
„ Remote Temperature Measurment up to 160°C by using offset shifting method (see “Measure Remote Temperature Higher Than 127°C” section)
应用范围 返回TOP
Desktop and Notebook
Central Office
Computers
Telecom Equipment
Smart Battery Packs
Test and Measurement
LAN Servers
Multi-Chip Modules
Industrial Controllers
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
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Temperature Transducer |
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Part NO. |
VCC(V) min. |
VCC(V) max. |
Sensor Gain |
VOUT (V) |
Sensor Range(°C) |
Accuracy (°C) |
Isupply (μA) |
Note |
Package |
|
2 |
5.5 |
-11.6 |
2.5~0.3 |
-55~130 |
±1 |
18 |
Negative temperature coefficient output |
TO126F/SC70-5(SOT353) |
|
|
Digital Interface Temperature Sensor |
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|
Part NO. |
VCC(V) min. |
VCC(V) max. |
Remote |
Local |
Interface |
Slave Address |
Accuracy (°C) |
Note |
Package |
|
3 |
5.5 |
N |
1 |
SMBus |
1001XXX |
±2 |
8 slave addresses 9 bits resolution |
SOP8/MSOP8/TDFN3X3-8 |
|
|
3 |
5.5 |
N |
1 |
SMBus |
1001XXX |
±1 |
8 slave addresses 11 bits resolution |
SOP8/MSOP8/TDFN3X3-8 /TDFN3X2-8 |
|
|
3 |
3.6 |
N |
1 |
SMBus |
1001000 |
±1 |
-10°C to 80°C±1°C(max) |
SOT23-5 |
|
|
3 |
5.5 |
1 |
1 |
SMBus |
1001100 |
±1 |
Support transitor mode |
SOP8/MSOP8 |
|
|
3 |
5.5 |
1 |
1 |
SMBus |
1001100 |
±1 |
Remote up to 160°C |
SOP8/MSOP8/TDFN3X3-8 |
|
|
3 |
5.5 |
N |
1 |
SMBus |
1001100 |
±3 |
Local temperature sensor |
MSOP8 |
|
|
3 |
5.5 |
2 |
1 |
SMBus |
1001100 |
±1 |
Support transistor mode |
MSOP10 |
|
|
3 |
5.5 |
1 |
1 |
SMBus |
1001100 |
±1 |
SMBus inputs are built-in switch to prevent reverse leakage |
SOP8/MSOP8/TDFN3X3-8 |
|
|
3 |
5.5 |
1 |
1 |
SMBus |
1001100 |
±1 |
Griffin |
SOP8 MSOP8 |
|
|
Thermal Switch |
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|
Part NO. |
VCC(V) min. |
VCC(V) max. |
Sensor |
Hysterisis VCCGND |
Output Type |
Accuracy (°C) |
Isupply (μA) |
Note |
Package |
|
4 |
5.5 |
-- |
10 or 30 |
Open Drain |
±3.5 |
33 |
N/A |
SOT23-5 |
|
|
3 |
5.5 |
Remote |
10 or 2 |
Open Drain |
±3 |
-- |
OT is set by SET0 and SET1, Thermal diode needed |
SOP8/MSOP8 |
|
|
2.7 |
5.5 |
Local |
10 or 30 |
Open Drain |
±3.5 |
33 |
OT is set by an external resistor |
SOT23-5/TDFN2X2-8 |
|
|
2.7 |
5.5 |
Local |
10 or 2 |
Open Drain |
±3.5 |
33 |
OT is set by an external resistor |
TDFN2X2-8/ADFN1.5X1.5-6/SOT23-5/SOT23-6 |
|
|
2.7 |
5.5 |
Remote |
Set by Resistor |
Open Drain |
-- |
70 |
8 Remote SensorsThermistor is needed |
TQFN3X3-16 |
|
|
2.7 |
5.5 |
Remote |
Set by Resistor |
Open Drain |
-- |
42 |
2 Remote SensorsThermistor is needed |
SOT23-8/AQFN1.5X1.5-8 |
|
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下一篇▶:CXHA3182带内置MOS开关的SMBus输入防止从总线到IC VCC的反向电流2线串行接口接受标准系统管理总线SMBus的写入字节读取字节发送字节和接收字节命令编程报警阈值和读取温度数据
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