概述

　　在智能门锁的应用中，无线透传模块需要满足传输距离远、优秀穿墙能力、误码率低、数据传输稳定性高等需求。

　　本方案介绍采用芯科实验室的32位低功耗MCU EFM32ZG +无线收发芯片Si4438为核心而设计的智能门锁无线透传模块。超低的休眠功耗，整个模块正常运行时平均功耗在20uA以内。无限通讯具有144db的RF链路预算，数据传输距离远，通信稳定性高，完全满足智能门锁无线通讯模块的需求。

　　优势

　　· Silicon Labs的32bit Cortex-M0+内核MCU EFM32ZG系列，其IO中断可在EM3模式下唤醒 MCU，满足在智能门锁中通过主板事件或者无线收发单元来唤醒MCU进行数据传输，EM3模式下 MCU 功耗仅 650nA。EFM32ZG系列具有丰富的外设，并且很多外设可在低功耗的EM2模式下工作，如LeTimer、LeUART、LeSense等，非常适用电池供电的智能门锁设计。

【EFM32ZG】

EFM32ZG Reference Manual

• 32-bit ARM Cortex-M0+ processor running at up to 24 MHz

• Up to 32 kB Flash and 4 kB RAM memory

• Energy efficient and autonomous peripherals

• Ultra low power Energy Modes with sub-µA operation

• Fast wake-up time of only 2 µs

The EFM32ZG microcontroller series revolutionizes the 8- to 32-bit market with a combination of unmatched performance and ultra low power consumption in both active- and sleep modes. EFM32ZG devices consume as little as 114 µA/MHz in run mode.

EFM32ZG's low energy consumption outperforms any other available 8-, 16-, and 32-bit solution. The EFM32ZG includes autonomous and energy efficient peripherals, high overall chip- and analog integration, and the performance of the industry standard 32-bit ARM Cortex-M0+ processor.

1 Energy Friendly Microcontrollers

1.1 Typical Applications

The EFM32ZG Zero Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications. These devices are developed to minimize the energy consumption by lowering both the power and the active time, over all phases of MCU operation. This unique combination of ultra low energy consumption and the performance of the 32-bit ARM Cortex-M0+ processor, help designers get more out of the available energy in a variety of applications.

Ultra low energy EFM32ZG microcontrollers are perfect for:

• Gas metering

• Energy metering

• Water metering

• Smart metering

• Alarm and security systems

• Health and fitness applications

• Industrial and home automation

0 1 2 3 4

1.2 EFM32ZG Development

Because EFM32ZG use the Cortex-M0+ CPU, embedded designers benefit from the largest development ecosystem in the industry, the ARM ecosystem. The development suite spans the whole design process and includes powerful debug tools, and some of the world’s top brand compilers. Libraries with documentation and user examples shorten time from idea to market.

The range of EFM32ZG devices ensure easy migration and feature upgrade possibilities.

About This Document

This document contains reference material for the EFM32ZG series of microcontrollers. All modules and

peripherals in the EFM32ZG series devices are described in general terms. Not all modules are present

in all devices, and the feature set for each device might vary. Such differences, including pin-out, are

covered in the device-specific datasheets.

2.1 Conventions

Register Names

Register names are given as a module name prefix followed by the short register name:

TIMERn_CTRL - Control Register

The "n" denotes the numeric instance for modules that might have more than one instance.

Some registers are grouped which leads to a group name following the module prefix:

GPIO_Px_DOUT - Port Data Out Register,

where x denotes the port instance (A,B,...).

Bit Fields

Registers contain one or more bit fields which can be 1 to 32 bits wide. Multi-bit fields are denoted with

(x:y), where x is the start bit and y is the end bit.

Address

The address for each register can be found by adding the base address of the module (found in the

Memory Map), and the offset address for the register (found in module Register Map).

Access Type

The register access types used in the register descriptions are explained in Table 2.1 (p. 3) .

Reserved

Registers and bit fields marked with reserved are reserved for future use. These should be written to 0

unless otherwise stated in the Register Description. Reserved bits might be read as 1 in future devices.

Reset Value

The reset value denotes the value after reset.

Registers denoted with X have an unknown reset value and need to be initialized before use. Note

that, before these registers are initialized, read-modify-write operations might result in undefined register

values.

Pin Connections

Pin connections are given as a module prefix followed by a short pin name:

USn_TX (USARTn TX pin)

The pin locations referenced in this document are given in the device-specific datasheet.

　　· Silicon labs无线收发器Si4438，发射功率20dBm，接收灵敏(-124dBm)，整体链路预算可达到144dBm，空旷环境下实测3.2km的通信距离@490MHz、2.4kbps、4.8k Deviation、RSSI -65dBm，信号穿透性强，可以适用于智能门锁的无线信号穿墙需求。功耗非常低，standby模式寄存器保持功耗仅40nA，采用LDC+PSM帧监测模式接收电流可以做到12uA以内，延长门锁电池寿命。RF射频链路包含开关最多只需12个器件，方便布局布线和硬件设计。开发设计采用GUI配置，开发简单，节省开发周期，实现产品快速面市。

　　相关元件供应

　　型号：SI4438-C2A-GMR 品牌：SILICON LABS

　　型号：SI4438-B1C-FMR 品牌：SILICON LABS

　　型号：SI4438-B1C-FM 品牌：SILICON LABS

【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

　　【智能门锁】

　　智能门锁是指区别于传统机械锁的基础上改进的，在用户安全性、识别、管理性方面更加智能化简便化的锁具。智能门锁是门禁系统中锁门的执行部件。

　　智能门锁区别于传统机械锁, 是具有安全性, 便利性, 先进技术的复合型锁具。

　　磁卡、射频卡(非接触类，安全性较高，塑料材质，配置携带较方便，价格低廉)

　　使用非机械钥匙作为用户识别ID的成熟技术，如：

　　指纹锁、虹膜识别门禁(生物识别类，安全性高，不存在丢失损坏;但不方便配置，成本高)

　　TM卡(接触类，安全性很高，不锈钢材质，配置携带极为方便，价格较低)

　　在以下场所应用较多：银行，政府部门(注重安全性)，以及酒店，学校宿舍，居民小区，别墅，宾馆(注重方便管理)

　　1.引用智能手机上进行操控如IOS平台或者android系统平台进行远程控制，输入设置好的密码进行控制，门会为你自动打开。

　　2.你以后再也不必担心你忘了带钥匙或者钥匙丢失而烦恼，你的家人也可以通过操作来为你远程开锁。

　　3.对于安全，wifi智能门锁有更完善的保护机制，授权过的任何人开锁、上锁、反锁，你和家人都可以及时掌握。

　　4 .在以下场所应用较多：。银行，政府部门(注重安全性)，酒店，学校宿舍，居民小区，别墅，宾馆(注重方便管理。

　　5.智能门锁主要应用于智能家居、智能旅店/酒店、智能建筑等系统中。

　　智能门锁控制方案中对门锁嵌入式开发是比较重要的一步，这样才能在硬件上实现无线数据转换以及无线控制。智能门锁主要采用的串口wifi模块TLN13UA06，它是新一代嵌入式Wi-Fi模块产品，软、硬件接口全面兼容TLG10UA03，蓝牙模块，蓝牙芯片，体积小，功耗低。

　　嵌入式wifi模块采用UART接口，内置IEEE802.11协议栈以及TCP/IP协议栈，能够实现用户串口到无线网络之间的转换。支持串口透明数据传输模式，可以使传统的串口设备可轻松接入无线网络。

　　智能门锁用电池，有四节电池，六节电池，八节电池，八节电池。