基于TI CC2540F256低功耗蓝牙片上系统的蓝牙体脂秤解决方案
原标题:蓝牙体脂秤方案
方案详情
一、蓝牙体脂秤方案设计简介
蓝牙4.0体脂秤设计方案,是基于TI低功耗蓝牙片上系统CC2540F256的近距离无线传输的设计,将嵌入式技术和无线通信技术有机结合起来,采用了二级定量称重控制,利用蓝牙4.0技术自动将称电子秤的测量数据传输到iPod touch5或iPhone4S, ipad3等支持蓝牙4.0的设备上显示,并自动地进行智能化的称重管理。
应用该方案的体脂秤以CC2540增强型内核C8051为信息处理单元,并以CC2540无线收发端为无线通信单元,主要由称重信号采集模块、输入输出控制电路、无线传输模块等部分组成。
二、 蓝牙体脂秤方案基本功能
1、一个家庭账户可添加19家庭成员;
2、蓝牙称通过蓝牙4.0将测量数据快速传输至用户,并上传到相应成员的信息库;
3、测量和记录9项身体健康指标,周月年报表和个性化的身体健康分析建议,更科学地反应肥胖程度;
4、可设目标体重、称重提醒、主题切换;
5、可设密码,确保用户隐私。
三、蓝牙体脂秤方案简述
1、 采用芯片:CSU1185
2、 开机方式:重力开机或上电开机
3、 显示精度:1500分度;
4、 标定方式:3点标定,标定位置是50Kg、100Kg、150Kg;
5、 记忆功能: 记忆范围:0.3±0.1Kg;记忆时间:长期记忆;
6、 低压检测:开机侦测低电压,一点侦测;
7、 关机时间:重物稳定后,8±2秒自动关机;
8、 功耗:在2K传感器的情况下,工作电流小于2.5mA;关机平均电流小于15uA;
9、 低压提示: 显示“Lo”4s后关机;
10、 背光控制输出: 无
11、 24LC02存储:有
12、 时钟功能: 无
13、 温度测量:无
14、 蜂 鸣 器:无
备注:带有如“CSU1185” 下滑线的数据可根据不同程序做相应的更改;
四、 蓝牙体脂秤方案基本功能
1、重量参数
1) 称重单位:Kg
2) 最大称重:152.0 Kg
3) 起秤重量(最小显示称重,追零范围):5.0 Kg±0.1 Kg
4) 归零范围:6.0 Kg
2、系统功能
1) E2PROM(24LC02)侦测:在开机时先检测是否有2402,若无此参数将显示E2PROM出错画面“ErrE”;
2) 校正检测:检测是否进入校正模式,通常在出厂前使用;
3) 开机低电压侦测:当电压低致2.4V±0.2 V显示低电压符号;
4) 显示重量极限:显示重量最大极限=最大限度+10g,若过载显示过载画面“O-Ld”;
5) 重量低于0显示“----”;
6) 当没有按键操作且重量没变化达到一定时间时,将自动进入睡眠模式。
3、按键操作
1) 开/关机键(On/Off): 开关机切换
系统在关机状态下,按此键液晶全显,3s后进入称重模式,显示首选单位“Kg”和重量“0.000”; 在开机状态下,按此键关机,在校正的情况下按此键无效。
2) 单位键(Unit):重量单位转换
每按一次此键,重量单位依次循环执行转换,其次序依次为:Kg->Lb->oz-> Kg。
3) 标定键(CAL):进入校正模式
长按On/Off键的同时,快速连续按Unit键4次将进入标定模式,校正流程见图1(三 重量校准)。
五、 蓝牙体脂秤方案适用范围
1、支持蓝牙4.0、安装IOS 5/6/7系列机型:
iPhone4S、iPhone5、iPhone5S、iPhone5c、iPod Touch。
2、支持安卓系列机型:
蓝牙4.0并且安装Android4.3的大部分机型。
性能参数
开发平台 : TI 德州仪器
交付形式 : 整机
性能参数 :
应用场景 : 蓝牙体脂秤
【CC2540】
具有 USB 的 SimpleLink 蓝牙智能无线 MCU
描述
The CC2540 is a cost-effective, low-power, true system-on-chip (SoC) for Bluetooth low energy applications. It enables robust BLE master or slave nodes to be built with very low total bill-of-material costs. The CC2540 combines an excellent RF transceiver with an industry-standard enhanced 8051 MCU, in-system programmable flash memory, 8-KB RAM, and many other powerful supporting features and peripherals. The CC2540 is suitable for systems where very low power consumption is required. Very low-power sleep modes are available. Short transition times between operating modes further enable low power consumption.
The CC2540 comes in two different versions: CC2540F128/F256, with 128 and 256 KB of flash memory, respectively.
Combined with the Bluetooth low energy protocol stack from Texas Instruments, the CC2540F128/F256 forms the market’s most flexible and cost-effective single-mode Bluetooth low energy solution.
特性
True Single-Chip BLE Solution: CC2540 Can Run Both Application and BLE Protocol
Stack, Includes Peripherals to Interface With Wide Range of Sensors, Etc.
6-mm × 6-mm Package
RF
Bluetooth low energy technology Compatible
Excellent Link Budget (up to 97 dB), Enabling Long-Range
Applications Without External Front End
Accurate Digital Received Signal-Strength Indicator (RSSI)
Suitable for Systems Targeting Compliance With Worldwide
Radio Frequency Regulations: ETSI EN 300 328 and
EN 300 440 Class 2 (Europe), FCC CFR47
Part 15 (US), and ARIB STD-T66 (Japan)
Layout
Few External Components
Reference Design Provided
6-mm × 6-mm QFN40 Package
Low Power
Active Mode RX Down to 19.6 mA
Active Mode TX (–6 dBm): 24 mA
Power Mode 1 (3-µs Wake-Up): 235 µA
Power Mode 2 (Sleep Timer On): 0.9 µA
Power Mode 3 (External Interrupts): 0.4 µA
Wide Supply Voltage Range (2 V–3.6 V)
Full RAM and Register Retention in All Power Modes
TPS62730 Compatible
Low Power in Active Mode
RX Down to 15.8 mA (3 V Supply)
TX (-6 dBm): 18.6 mA (3 V Supply)
Microcontroller
High-Performance and Low-Power 8051 Microcontroller Core
In-System-Programmable Flash, 128 KB or 256 KB
8-KB SRAM
Peripherals
12-Bit ADC with Eight Channels and Configurable Resolution
Integrated High-Performance Op-Amp and Ultralow-Power Comparator
General-Purpose Timers (One 16-Bit, Two 8-Bit)
21 General-Purpose I/O Pins (19× 4 mA, 2× 20 mA)
32-kHz Sleep Timer With Capture
Two Powerful USARTs With Support for Several Serial Protocols
Full-Speed USB Interface
IR Generation Circuitry
Powerful Five-Channel DMA
AES Security Coprocessor
Battery Monitor and Temperature Sensor
Each CC2540 Contains a Unique 48-bit IEEE Address
Software Features
Bluetooth v4.0 Compliant Protocol Stack
for Single-Mode BLE Solution
Complete Power-Optimized Stack, Including Controller and
Host
GAP – Central, Peripheral, Observer, or Broadcaster
(Including Combination Roles)
ATT / GATT – Client and Server
SMP – AES-128 Encryption and Decryption
L2CAP
Sample Applications and Profiles
Generic Applications for GAP Central and Peripheral Roles
Proximity, Accelerometer, Simple Keys, and Battery GATT Services
Multiple Configuration options
Single-Chip Configuration, Allowing Application to Run on CC2540
Network Processor Interface for Applications Running on an External Microcontroller
BTool – Windows PC Application for Evaluation, Development, and Test
Development Tools
CC2540 Mini Development Kit
SmartRF Software
Supported by IAR Embedded Workbench Software for 8051
APPLICATIONS
2.4-GHz Bluetooth low energy Systems
Mobile Phone Accessories
Sports and Leisure Equipment
Consumer Electronics
Human Interface Devices (Keyboard, Mouse, Remote Control)
USB Dongles
Health Care and Medical
CC2540 with TPS62730
TPS62730 is a 2 MHz Step Down Converter with Bypass Mode
Extends Battery Lifetime by up to 20%
Reduced Current in TX and RX
30 nA Bypass Mode Current to Support Low Power Modes
RF Performance Unchanged
Small Package Allows for Small Solution Size
CC2540 Controllable
责任编辑:David
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