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[原创] Maxim MAX30208±0.1℃精度I2C数字温度传感器解决方案

关键词:可穿戴 仪器仪表 温度传感器 MAX30208

时间:2019-08-16 10:48:54       来源:中电网

Maxim公司的MAX30208是低功耗高精度I2C数字温度传感器,温度范围+30℃到 +50℃的精度为±0.1℃,0℃到+70℃温度范围的精度为±0.15℃.MAX30208具有16位分辨率(0.005℃).器件具有标准I2C串口和主控制器进行通信.器件包括用于温度数据的32字FIFO,同时还包括高和低温度阈值告警.低功耗1.7-3.6V工作电压,测量时的工作电流67μA,待机时的电流为0.5μA,积分时间为15ms,小型2mm x 2mm x 0.75mm, 10-引脚薄 LGA封装.主要用在可穿戴身体温度监视器,医疗温度计和物联网(IoT)传感器.本文介绍了MAX30208主要优势和特性,简化框图,功能框图和单点与多点温度检测图,以及评估系统MAX30208 EVS主要特性,电路图,材料清单和PCB设计图.

The MAX30208 operates from a 1.7V to 3.6V supply voltage, and is a low-power, high-accuracy digital tem­perature sensor with ±0.1℃ accuracy from +30℃ to +50℃ and ±0.15℃ accuracy from 0℃ to +70℃. The MAX30208 has 16-bit resolution (0.005℃).

The device uses a standard I2C serial interface to com­municate with a host controller. Two GPIO pins are avail­able. GPIO1 can be configured to trigger a temperature conversion, while GPIO0 can be configured to generate an interrupt for selectable status bits.

The MAX30208 includes a 32-word FIFO for the tempera­ture data and also includes high and low threshold digital temperature alarms. The device is available in a 2mm x 2mm x 0.75mm, 10-pin Thin LGA package.

MAX30208主要优势和特性:

High Accuracy and Precision±0.1℃ Accuracy from +30℃ to +50℃
±0.15℃ Accuracy from +0℃ to +70℃
Low Power Consumption1.7V to 3.6V Operating Voltage
67μA Operating Current During Measurement
0.5μA Standby Current
15ms Integration Time
Small Size2mm x 2mm x 0.75mm, 10-Pin Thin LGA
Safety and ComplianceHigh and Low Temperature Alarms
Digital InterfaceConfigurable Convert Temperature Input Pin
Configurable Interrupt Output Pin
32-Word FIFO for Temperature Data
4 I2C Addresses Available—More Addresses Available by Request
Unique ROM IDs Allow Device to be NIST Traceable

MAX30208应用:

Wearable Body Temperature Monitors
Medical Thermometers
Internet of Things (IoT) Sensors

图1.MAX30208简化框图

图2.MAX30208功能框图

图3.MAX30208单点温度检测图

图4.MAX30208具有特别特性的单点温度检测图

图5.MAX30208多达4个I2C地址的多点温度检测图

评估系统MAX30208 EVS

The MAX30208 evaluation system (EV system) provides a single platform to evaluate the MAX30208, a temperature sensor with ±0.1℃ accuracy. The EV system consists of two boards connected through headers, a MAX32630FTHR microcontroller board, and the MAX30208 interface board. Also included with the EV system is a flex PCB that holds the MAX30208 IC. The MAX32630FTHR contains the firmware necessary to use the PC GUI program and also provides power to the MAX30208 interface board. The MAX30208 interface board ships with jumpers preinstalled to allow quick evaluation of the MAX30208.

评估系统MAX30208 EVS主要特性:

Flexible PCB Design Low Thermal Mass Allows for Fast Response Time
Sense Temperature Away from Extra Circuitry
Easy to Reach Test Points
Fully Assembled and Tested
Windows® 7, 8, and 10-Compatible Software

图6.评估系统MAX30208 EVS外形图

图7.MAX30208 Sensor Flex电路图

图8. MAX30208接口板电路图
MAX30208 Sensor Flex材料清单:

MAX30208接口板材料清单:


图9.评估系统MAX30208 EVS接口板PCB布局图:顶层丝印

图10.评估系统MAX30208 EVS接口板PCB布局图:顶层

图11.评估系统MAX30208 EVS接口板PCB布局图:底层

图12.评估系统MAX30208 EVS接口板PCB布局图:底层丝印

图13.评估系统MAX30208 EVS传感器Flex PCB布局图:顶层丝印

图14.评估系统MAX30208 EVS传感器Flex PCB布局图:顶层

图15.评估系统MAX30208 EVS传感器Flex PCB布局图:底层

图16.评估系统MAX30208 EVS传感器Flex PCB布局图:底层丝印
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX30208.pdf
https://datasheets.maximintegrated.com/en/ds/MAX30208EVSYS.pdf
MAX30208.pdf
MAX30208EVSYS.pdf

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