概述

　　疫苗在运输过程中因环境的温湿度超范围而失效，造成婴幼儿夭折事件引起了广泛重视，如何才能保证药品运输安全呢?此方案通过在冷藏车厢内根据实际需求放置2-3个无线采集器，采集冷藏车厢内不同位置的温湿度值，通过无线传给驾驶室内由点烟器供电的汇集器，汇集器上集成GPRS把信息传输给云端，全程进行监控，保证特殊药品在运输环节中的安全。

　　优势

　　· Silicon Labs的EFM32HG210F64-QFN32，运行模式下功耗114μA / MHz，深度睡眠RTC工作功耗900nA，满足电池供电的设计要求，集成低功耗USB，使PC机通过USB口读取保存的采集值。

【EFM32HG210F32-QFN32】

具有 EFM32HG210F32-QFN32 ARM Cortex-M0+ USB 的 32位微控制器

EFM32HG210F32-QFN32 是具有 USB 的基于 ARM Cortex-M0+ 的微控制器 (MCU)，速度可达 25 MHz，是 Happy Gecko 节能设备系列的一部分。建立在低能耗平台之上，该低能耗平台包括创新型低能耗技术、快速唤醒时间和最适合能源敏感应用的节能模式 EFM32HG210F32-QFN32。另外，本设备包括 32 kB 闪存、4 B RAM、24 数字 I/O 引脚、3 x 16 位定时器和多种通信接口。

规格摘要

MCU 内核：ARM Cortex-M0+ MHz：25 闪存 (kB)：32 RAM (kB)：4 I²S：1 SPI：2 I²C：1 UART：3 USART：2 USB：否 数字 I/0 引脚：24 ADC：12 位、4 通道、1 Msps DAC：— LCD：否 封装类型：QFN32 封装尺寸：6 × 6

EFM32 Happy Gecko Family EFM32HG Data Sheet

The EFM32 Happy Gecko MCUs are the world’s most energyfriendly microcontrollers.

The EFM32HG offers unmatched performance and ultra low power consumption in both active and sleep modes. EFM32HG devices consume as little as 0.6 μA in Stop mode and 127 μA/MHz in Run mode. It also features autonomous peripherals, high overall chip and analog integration, and the performance of the industry standard 32-bit ARM CortexM0+ processor, making it perfect for battery-powered systems and systems with highperformance, low-energy requirements.

EFM32HG applications include the following:

• Energy, gas, water and smart metering

• Health and fitness applications

• Smart accessories

• Alarm and security systems

• Industrial and home automation

KEY FEATURES

• ARM Cortex-M0+ at 25 MHz

• Ultra low power operation

• 0.6 μA current in Stop (EM3), with brown-out detection and RAM retention

• 51 μA/MHz in EM1

• 127 μA/MHz in Run mode (EM0)

• Fast wake-up time of 2 µs

• Hardware cryptography (AES)

• Up to 64 kB of Flash and 8 kB of RAM

Feature List

• ARM Cortex-M0+ CPU platform

• High Performance 32-bit processor @ up to 25 MHz

• Wake-up Interrupt Controller

• Flexible Energy Management System

• 20 nA @ 3 V Shutoff Mode

• 0.6 µA @ 3 V Stop Mode, including Power-on Reset, Brown-out Detector, RAM and CPU retention

• 0.9 µA @ 3 V Deep Sleep Mode, including RTC with 32.768 kHz oscillator, Power-on Reset, Brown-out Detector, RAM and CPU

retention

• 51 µA/MHz @ 3 V Sleep Mode

• 127 µA/MHz @ 3 V Run Mode, with code executed from flash

• 64/32 kB Flash

• 8/4 kB RAM

• Up to 37 General Purpose I/O pins

• Configurable push-pull, open-drain, pull-up/down, input filter, drive strength

• Configurable peripheral I/O locations

• Up to 16 asynchronous external interrupts

• Output state retention and wake-up from Shutoff Mode

• 6 Channel DMA Controller

• 6 Channel Peripheral Reflex System (PRS) for autonomous inter-peripheral signaling

• Hardware AES with 128-bit keys in 54 cycles

• Timers/Counters

• 3× 16-bit Timer/Counter

• 3×3 Compare/Capture/PWM channels

• Dead-Time Insertion on TIMER0

• 1× 24-bit Real-Time Counter

• 1× 16-bit Pulse Counter

• Watchdog Timer with dedicated RC oscillator @ 50 nA

• Communication interfaces

• Up to 2× Universal Synchronous/Asynchronous Receiver/Transmitter

• UART/SPI/SmartCard (ISO 7816)/IrDA/I2S

• Triple buffered full/half-duplex operation

• Low Energy UART

• Autonomous operation with DMA in Deep Sleep Mode

• I2C Interface with SMBus support

• Address recognition in Stop Mode

• Low Energy Universal Serial Bus (USB) Device

• Fully USB 2.0 compliant

• On-chip PHY and embedded 5V to 3.3V regulator

• Crystal-free operation

• Ultra low power precision analog peripherals

• 12-bit 1 Msamples/s Analog-to-Digital Converter

• 4 single-ended channels/2 differential channels

• On-chip temperature sensor

• Current Digital-to-Analog Converter

• Selectable current range between 0.05 and 64 µA

• 1× Analog Comparator

• Capacitive sensing with up to 5 inputs

• Supply Voltage Comparator

• Ultra efficient Power-on Reset and Brown-Out Detector

• Debug Interface

• 2-pin Serial Wire Debug interface

• Micro Trace Buffer (MTB)

• Pre-Programmed USB/UART Bootloader

• Temperature range -40 to 85 ºC

• Single power supply 1.98 to 3.8 V

• Packages:

• CSP36 (3×3 mm)

• QFN24 (5×5 mm)

• QFN32 (6×6 mm)

• TQFP48 (7×7 mm)

EFM32HG系列：

EFM32HG108F32-B-QFN24

EFM32HG108F64-B-QFN24

EFM32HG110F32-B-QFN24

EFM32HG110F64-B-QFN24

EFM32HG210F32-B-QFN32

EFM32HG210F64-B-QFN32

EFM32HG222F64-B-QFP48

EFM32HG222F32-B-QFP48

EFM32HG308F32-B-QFN24

EFM32HG308F64-B-QFN24

EFM32HG309F32-B-QFN24

EFM32HG309F64-B-QFN24

EFM32HG310F32-B-QFN32

EFM32HG310F64-B-QFN32

EFM32HG321F32-B-QFP48

EFM32HG321F64-B-QFP48

EFM32HG322F32-B-QFP48

EFM32HG322F64-B-QFP48

EFM32HG350F32-B-CSP36

EFM32HG350F64-B-CSP36

　　· Silicon Labs的温湿度传感器Si7021,满足采集器在20%-70%湿度范围内精度不小于4%的要求， 2℃ - 8℃温度范围内精度不小于0.5%;240uA测量电流，0.06uA待机电流，延长电池使用寿命且有完整的参考代码。

【Si7021】

带 I2C 接口的 Si7021-A20-IM1 数字相对湿度和温度传感器

Si7021-A20-IM1 数字相对湿度和温度传感器将湿度和温度传感器元件、一个模拟数字转换器、信号处理功能以及一个 I2C 接口集成到单一芯片中。Si7021-A20-IM1 具有 ±0.4 °C 的温度精度和 ±3% 的相对湿度精度。创新性 CMOS 设计还为相对湿度和温度传感器提供业内最低功耗。凭借完全的工厂校准，Si7021-A20-IM1 在 PCB 装配期间不需要额外的相对湿度/温度校准。

规格摘要

温度精度最大值 (C):±0.4

相对湿度精度最大值：±3%

温度范围下限 (ºC)：-40

温度范围上限 (ºC)：125

滤波器盖：是

封装格式：绝缘卷带

封装类型：DFN6

【Si7020】

I2C HUMIDITY AND TEMPERATURE SENSOR

Features

> Precision Relative Humidity Sensor

》 ± 4% RH (max), 0–80% RH

> High Accuracy Temperature Sensor

》±0.4 °C (max), –10 to 85 °C

> 0 to 100% RH operating range

> Up to –40 to +125 °C operatingrange

> Wide operating voltage(1.9 to 3.6 V)

> Low Power Consumption

》150 µA active current

》60 nA standby current

> Factory-calibrated

> I2C Interface

> Integrated on-chip heater

> 3x3 mm DFN Package

> Excellent long term stability

> Optional factory-installed cover

》Low-profile

》Protection during reflow

》Excludes liquids and particulates

Applications

> HVAC/R

> Thermostats/humidistats

> Respiratory therapy

> White goods

> Indoor weather stations

> Micro-environments/data centers

> Automotive climate control and defogging

> Asset and goods tracking

> Mobile phones and tablets

Description

The Si7020 I2C Humidity and Temperature Sensor is a monolithic CMOS IC integrating humidity and temperature sensor elements, an analog-to-digital converter, signal processing, calibration data, and an I2C Interface. The patented use of industry-standard, low-K polymeric dielectrics for sensing humidity enables the construction of low-power, monolithic CMOS Sensor ICs with low drift and hysteresis, and excellent long term stability.

The humidity and temperature sensors are factory-calibrated and the calibration data is stored in the on-chip non-volatile memory. This ensures that the sensors are fully interchangeable, with no recalibration or software changes required.

The Si7020 is available in a 3x3 mm DFN package and is reflow solderable. It can be used as a hardware- and software-compatible drop-in upgrade for existing RH/ temperature sensors in 3x3 mm DFN-6 packages, featuring precision sensing over a wider range and lower power consumption. The optional factory-installed cover offers a low profile, convenient means of protecting the sensor during assembly (e.g., reflow soldering) and throughout the life of the product, excluding liquids (hydrophobic/oleophobic) and particulates.

The Si7020 offers an accurate, low-power, factory-calibrated digital solution ideal for measuring humidity, dew-point, and temperature, in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms.

Functional Block Diagram

　　· Silicon Labs的无线收发器Si4438,满足采集器在30米内实现低功耗传输的要求。Si4438 灵敏度-124dBm，发射功率20dBm，链路预算144dBm。RX 接收电流14mA，Standby模式功耗40nA。提供完整的PCB参考图，采用GUI配置代码。

【Si4438】

HIGH-PERFORMANCE, LOW-CURRENT TRANSCEIVER

Features

> Frequency range = 425–525 MHz

> Receive sensitivity = –124 dBm

> Modulation

》(G)FSK

》OOK

> Max output power

》+20 dBm

> Low active power consumption

》14 mA RX

> Ultra low current powerdown modes

》30 nA shutdown, 50 nA standby

> Data rate = 100 bps to 500 kbps

> Fast wake and hop times

> Power supply = 1.8 to 3.6 V

> Excellent selectivity performance

》58 dB adjacent channel

》75 dB blocking at 1 MHz

> Antenna diversity and T/R switch control

> Highly configurable packet handler

> TX and RX 64 byte FIFOs

> Auto frequency control (AFC)

> Automatic gain control (AGC)

> Low BOM

> Low battery detector

> Temperature sensor

> 20-Pin QFN package

> IEEE 802.15.4g ready

> China regulatory

Applications

> China smart meters

Description

Silicon Laboratories' Si4438 is a high-performance, low-currenttransceivers covering the sub-GHz frequency bands from 425 to525 MHz. The Si4438 is targeted at the Chinese smart meter market andis especially suited for electric meters. This device is footprint- andpin-compatible with the Si446x radios, which provide industry-leadingperformance for worldwide sub-GHz applications. The radios are part ofthe EZRadioPRO® family, which includes a complete line of transmitters,receivers, and transceivers covering a wide range of applications. Allparts offer outstanding sensitivity of –124 dBm while achieving extremelylow active and standby current consumption. The 58 dB adjacent channelselectivity with 12.5 kHz channel spacing ensures robust receiveoperation in harsh RF conditions. The Si4438 offers exceptional outputpower of up to +20 dBm with outstanding TX efficiency. The high outputpower and sensitivity results in an industry-leading link budget of 144 dBallowing extended ranges and highly robust communication links.

Functional Block Diagram

　　· EPSON 晶体：TSX-3225 30 MHz，12pF，±10ppm精度，Si4438专用晶体。频率稳定、体积小、受温度影响小，使系统运行稳定可靠，成本低，常备库存。

【TSX-3225】

FA- 238V/ FA- 238 TSX- 3225

•Frequency range : 12 MHz to 60 MHz(FA-238,FA-238V)

•Thickness : 0.6 mm Max.(TSX-3225)

•Overtone order : Fundamental

•Applications : Mobile phone, Bluetooth, W-LAN

: ISM band radio, Clock for MPU

　　相关元件供应

　　型号：SI4438-C2A-GMR        品牌：SILICON LABS

　　型号：X1E000021048100       品牌：EPSON

　　型号：SI4438-B1C-FMR         品牌：SILICON LABS

　　型号：SI7021-A20-IM1R        品牌：SILICON LABS

　　型号：SP1005-01ETG             品牌：LITTELFUSE

　　型号：SI7021-A20-GM1R       品牌：SILICON LABS

　　冷链运输(Cold-chain transportation)是指在运输全过程中，无论是装卸搬运、变更运输方式、更换包装设备等环节，都使所运输货物始终保持一定温度的运输。

　　冷链运输方式可以是公路运输、水路运输、铁路运输、航空运输，也可以是多种运输方式组成的综合运输方式。 冷链运输是冷链物流的一个重要环节，冷链运输成本高，而且包含了较复杂的移动制冷技术和保温箱制造技术，冷链运输管理包含更多的风险和不确定性。

　　冷链运输的对象主要分为三大类：

　　1、鲜活品：蔬菜、水果;肉、禽、蛋;水产品、花卉产品。

　　2、加工食品：速冻食品、禽、肉、水产等包装熟食、冰淇淋和奶制品;快餐原料。

　　3、医药产品：各类需要冷藏的药品、医疗器械等。

　　①快装快运。②轻装轻卸。③防热防冻。④平稳运输。3P、3C、3T、3Q。

　　中国因丢弃腐烂食品而造成的浪费每年达到700亿元人民币，占食品生产总值的20%之多。一些食品在运输过程当中因无法长期保鲜而被丢弃。专家称这种浪费现象主要是由于缺少“冷链运输”体系而造成的。鲜活易腐货物运输中，除了少数部分确因途中照料或车辆不适造成死亡外，其中大多数都是因为发生腐烂所致，发生腐烂的原因，对于动物性食品来说，主要是微生物的作用。对于植物性食品来说，腐烂的原因主要是呼吸作用所致。清楚了鲜活易腐货物腐烂变质的原因，就可以得出低温可以抑制微生物的增长，减缓呼吸作用，达到延长鲜活易腐货物的保存实践的目的。

　　冷链运输过程必须依靠冷冻或冷藏等专用车辆进行，冷冻或冷藏专用车辆除了需要有一班货车相同的车体与机械之外，必须额外在车上设置冷冻或冷藏与保温设备。在运输过程中要特别注意必须是连续的冷藏，因为微生物活动和呼吸作用都随着温度的升高而加强，如果运输中各环节不能保证连续冷藏的条件，那么货物就有可能在这个环节中开始腐烂变质。在运输时，应该根据货物的种类、运送季节、运送距离和运送地方确定运输方法。在运输过程中，尽量组织“门到门”的直达运输，提高运输速度，温度要符合规定。为保持冷冻货物的冷藏温度，可紧密堆码，水果、蔬菜等需要通风散热的货物，必须在货件之间保留一定的空隙，以确保货物的完好。

　　冷链运输要求在中、长途运输及短途配送等运输环节的低温状态。它主要涉及铁路冷藏车、冷藏汽车、冷藏船、冷藏集装箱等低温运输工具。在冷藏运输过程中，温度波动是引起货物品质下降的主要原因之一，所以运输工具应具有良好性能，在保持规定低温的同时，更要保持稳定的温度，远途运输尤其重要 。