应用领域：智能家电

方案类型：模块板卡

主控芯片：STM32F103C8T6

方案概述

1、项目简介：

本音乐计时器是集成蓝牙、FM、MP3、LCD、温度传感器和TF卡于一体的音乐播放器和FM收音机的消费类电子产品。

2、项目需求：

1 开发一个定时闹钟产品，带时钟显示，闹钟设置，可以播放蓝牙、TF卡、收音机的功能。还可以显示温度;

2 闹钟设置是用傻瓜固定按键方式来设置，会有很多按键，分十分钟，一个小时，五个小时等;

3 播放音乐并且计时的时候，计时时间到了以后。音乐需要暂停，然后在播放计时结束提示音;

3、设计方案：

本项目为一个计时器项目，显示屏可以选用自定义断码屏为时钟和温度显示载体;主控芯片采用STM32F103C8T6，该处理器带有RTC时钟和闹钟功能;音乐播放功能使用BK3254蓝牙模块，该模块支持智能语音提示及报号功能，集成TF卡播放功能，集成移动U盘播放功能，支持内部LINE-IN，支持内部FM收音功能，基本能满足项目需求;锂电池充电管理芯片采用TP4056，最大充电电流可以达到1000mA;锂电池保护芯片采用DW01MC-SA具有输出短路过冲保护等功能;音频功放采用PAM8403芯片，工作电压为5V，输出功率为3W;温度传感器采用DS18B20传感器，温度检测精度为0.125

【 STM32F103C8T6 】

Mainstream Performance line, ARM Cortex-M3 MCU with 64 Kbytes Flash, 72 MHz CPU, motor control, USB and CAN

The STM32F103xx medium-density performance line family incorporates the high-performance ARM®Cortex®-M3 32-bit RISC core operating at a 72 MHz frequency, high-speed embedded memories (Flash memory up to 128 Kbytes and SRAM up to 20 Kbytes), and an extensive range of enhanced I/Os and peripherals connected to two APB buses. All devices offer two 12-bit ADCs, three general purpose 16-bit timers plus one PWM timer, as well as standard and advanced communication interfaces: up to two I2Cs and SPIs, three USARTs, an USB and a CAN.

The devices operate from a 2.0 to 3.6 V power supply. They are available in both the –40 to +85 °C temperature range and the –40 to +105 °C extended temperature range. A comprehensive set of power-saving mode allows the design of low-power applications.

The STM32F103xx medium-density performance line family includes devices in six different package types: from 36 pins to 100 pins. Depending on the device chosen, different sets of peripherals are included, the description below gives an overview of the complete range of peripherals proposed in this family.

These features make the STM32F103xx medium-density performance line microcontroller family suitable for a wide range of applications such as motor drives, application control, medical and handheld equipment, PC and gaming peripherals, GPS platforms, industrial applications, PLCs, inverters, printers, scanners, alarm systems, video intercoms, and HVACs.

Key Features

ARM® 32-bit Cortex® -M3 CPU Core

72 MHz maximum frequency,1.25 DMIPS/MHz (Dhrystone 2.1) performance at 0 wait state memory access

Single-cycle multiplication and hardware division

Memories

64 or 128 Kbytes of Flash memory

20 Kbytes of SRAM

Clock, reset and supply management

2.0 to 3.6 V application supply and I/Os

POR, PDR, and programmable voltage detector (PVD)

4-to-16 MHz crystal oscillator

Internal 8 MHz factory-trimmed RC

Internal 40 kHz RC

PLL for CPU clock

32 kHz oscillator for RTC with calibration

Low-power

Sleep, Stop and Standby modes

VBAT supply for RTC and backup registers

2 x 12-bit, 1 μs A/D converters (up to 16 channels)

Conversion range: 0 to 3.6 V

Dual-sample and hold capability

Temperature sensor

DMA

7-channel DMA controller

Peripherals supported: timers, ADC, SPIs, I2 Cs and USARTs

Up to 80 fast I/O ports

26/37/51/80 I/Os, all mappable on 16 external interrupt vectors and almost all 5 V-tolerant

Debug mode

Serial wire debug (SWD) & JTAG interfaces

7 timers

Three 16-bit timers, each with up to 4 IC/OC/PWM or pulse counter and quadrature (incremental) encoder input

16-bit, motor control PWM timer with dead-time generation and emergency stop

2 watchdog timers (Independent and Window)

SysTick timer 24-bit downcounter

Up to 9 communication interfaces

Up to 2 x I2 C interfaces (SMBus/PMBus)

Up to 3 USARTs (ISO 7816 interface, LIN, IrDA capability, modem control)

Up to 2 SPIs (18 Mbit/s)

CAN interface (2.0B Active)

USB 2.0 full-speed interface

CRC calculation unit, 96-bit unique ID

Packages are ECOPACK®

电路原理图

【BK3254】

The BK3254 chip is a highly integrated single-chip Bluetooth multimedia device. It integrates Bluetooth transceiver, FM receiver, SD-card interface, USB OTG, and high performance audio peripheral. The BK3254 cache based architecture enables it is fully programmable with any application, that it may be used for control and multimedia hybrid application.

Features

 Operation voltage from 2.8 V to 5.2 V

 Bluetooth 4.1 compliant

 -90 dBm sensitivity for 1 Mbps mode and 5 dBm transmit power

 -107 dBm sensitivity FM receiver

 1-wire or 4-wires SD-card interface

 USB 2.0 host and device

 Integrated 90 dB SNR ADC and stereo DAC

 I2C,SPI and UART interface

 Bluetooth A2DP, AVRCP and HFP profile

 SSOP24, SSOP28, QFN32 package

Applications

 Multi-mode Bluetooth stereo speaker

 Bluetooth control and multimedia hybrid