应用领域： 汽车电子

主控芯片：STM32F105

方案简介

OBD即插即用，快速安装

对外提供独立3A电源和ACC信号，保护原车ECU、保险盒

安全驾驶辅助，H-TPMS胎压监测，车辆报警实时预警

蓝牙传输，车辆状态实时掌握

休眠电流达到微安级

方案概述

VISS汽车信息安全系统

　VISS，全称为Vehicle Information Safety System，汽车信息安全系统。是由深圳市尚摄科技有限公司独立开发设计的一套汽车信息安全系统。VISS产品为后视镜导航、行车记录仪、大屏导航、HUD等智能车载设备与原车提供桥接通讯，旨在提升驾驶者的交互体验和驾驶安全性。也为车联网厂家提供标准化的车辆数据接入方案。

1.VISS产品功能

1.1 OBD智能供电

VISS产品通过OBD给车载智能设备供电，独立保险，安全可靠，免去了改动保险或者破线的各种维修风险。

1.2 H-TPMS胎压监测

VISS产品H-TPMS模块采用欧洲最新的前装间接式胎压技术，无需安装任何传感器、无需扒轮胎，能准确报警具体失压轮胎，技术安全可靠，售后维护成本相对低。

H-TPMS经过各种路况测试，通过国家轿车质量监督检验中心技术鉴定符合汽车轮胎气压监视系统的相关国家标准。（证书编号：QA15XX1G74881）

1.3 行车电脑功能

VISS产品通过标准化的原车OBD接口，获取原车的状态信息、车辆保养信息、车辆报警信息等，并将这些信息传递给各类车载智能设备，为车载智能设备和原车提供桥接通讯。

VISS产品为车联网厂家提供汽车网络的入口信息，目前已兼容主流品牌的200多款车型，解决了车联网的碎片化问题。

VISS行车电脑功能支持定制化、差异化。

2.VISS产品特性

安全性：

OBD独立电源，保护原车ECU、保险盒；

电池电压全时监控预警；

车辆报警实时预警；

H-TPMS胎压监测；

安全驾驶辅助；

智能性：

车辆状态实时掌握；

车辆保养信息实时提醒；

便利性：

即插即用，快速安装；

无需花费时间找保险位置。

STM32F105

The STM32F105xx and STM32F107xx connectivity 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 256 Kbytes and SRAM 64 Kbytes), and an extensive range of enhanced I/Os and peripherals connected to two APB buses. All devices offer two 12-bit ADCs, four general-purpose 16-bit timers plus a PWM timer, as well as standard and advanced communication interfaces: up to two I2Cs, three SPIs, two I2Ss, five USARTs, an USB OTG FS and two CANs. Ethernet is available on the STM32F107xx only.

The STM32F105xx and STM32F107xx connectivity line family operates in the –40 to +105 °C temperature range, from a 2.0 to 3.6 V power supply. A comprehensive set of power-saving mode allows the design of low-power applications.

The STM32F105xx and STM32F107xx connectivity line family offers devices in three different package types: from 64 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 STM32F105xx and STM32F107xx connectivity line microcontroller family suitable for a wide range of applications such as motor drives and application control, medical and handheld equipment, industrial applications, PLCs, inverters, printers, and scanners, alarm systems, video intercom, HVAC and home audio equipment.

Figure 1 shows the general block diagram of the device family.

Key Features

Core: ARM® 32-bit Cortex® -M3 CPU

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 to 256 Kbytes of Flash memory

64 Kbytes of general-purpose SRAM

Clock, reset and supply management

2.0 to 3.6 V application supply and I/Os

POR, PDR, and programmable voltage detector (PVD)

3-to-25 MHz crystal oscillator

Internal 8 MHz factory-trimmed RC

Internal 40 kHz RC with calibration

32 kHz oscillator for RTC with calibration

Low power

Sleep, Stop and Standby modes

VBAT supply for RTC and backup registers

2 × 12-bit, 1 μs A/D converters (16 channels)

Conversion range: 0 to 3.6 V

Sample and hold capability

Temperature sensor

up to 2 MSPS in interleaved mode

2 × 12-bit D/A converters

DMA: 12-channel DMA controller

Supported peripherals: timers, ADCs, DAC, I2Ss, SPIs, I2Cs and USARTs

Debug mode

Serial wire debug (SWD) & JTAG interfaces

Cortex® -M3 Embedded Trace Macrocell™

Up to 80 fast I/O ports

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

CRC calculation unit, 96-bit unique ID

Up to 10 timers with pinout remap capability

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

1 × 16-bit motor control PWM timer with dead-time generation and emergency stop

2 × watchdog timers (Independent and Window)

SysTick timer: a 24-bit downcounter

2 × 16-bit basic timers to drive the DAC

Up to 14 communication interfaces with pinout remap capability

Up to 2 × I2C interfaces (SMBus/PMBus)

Up to 5 USARTs (ISO 7816 interface, LIN, IrDA capability, modem control)

Up to 3 SPIs (18 Mbit/s), 2 with a multiplexed I2S interface that offers audio class accuracy via advanced PLL schemes

2 × CAN interfaces (2.0B Active) with 512 bytes of dedicated SRAM

USB 2.0 full-speed device/host/OTG controller with on-chip PHY that supports HNP/SRP/ID with 1.25 Kbytes of dedicated SRAM

10/100 Ethernet MAC with dedicated DMA and SRAM (4 Kbytes): IEEE1588 hardware support, MII/RMII available on all packages

电路原理图

STM32F1 系列  

STM32 F1系列主流MCU

STM32 F1系列主流MCU满足了工业、医疗和消费类市场的各种应用需求。凭借该产品系列，意法半导体在全球ARM Cortex-M 微控制器领域处于领先地位，同时树立了嵌入式应用的里程碑。该系列利用一流的外设和低功耗、低压操作实现了高性能，同时还以可接受的价格、利用简单的架构和简便易用的工具实现了高集成度。

该系列包含五个产品线，它们的引脚、外设和软件均兼容。

超值型STM32F100 - 24 MHz CPU，具有电机控制和CEC功能

基本型STM32F101 - 36 MHz CPU，具有高达1MB的Flash

STM32F102 – 48 MHz CPU具备USB FS

增强型STM32F103 - 72 MHz CPU，具有高达1MB的Flash、电机控制、USB和CAN

互联型STM32F105/107 - 72 MHz CPU，具有以太网MAC、CAN和USB 2.0 OTG