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基于RL78/F14、R1524x主控器件的车载无主机倒车雷达解决方案

2018-01-24

类别：汽车电子

430

拍明

　　倒车雷达，作用是你在倒车的时候，车尾与车后障碍物太近时，会发出警报，从而避免因为视线盲区，倒车时车尾碰撞。你买的时候，没有倒车雷达，你如果技术没问题的话，我觉得没必要安装，有没有倒车雷达并不影响汽车使用的，买的时候就没有，加装该线路也比较麻烦。所以，如果倒车你确实需要这个功能，你就买一个自带倒车雷达甚至倒车影像系统的车，如果没这个需要，你就真不用花钱买鸡肋了。

概述

　　在传统倒车雷达中，超声波雷达应用领域最广，本方案介绍超声波雷达脉冲测距法方案，结合车前后4个探头的测量数据，通过软件算法估算测量点与目标间的距离。该方案所用的瑞萨MCU集成车载控制所需要的通讯需求，符合AEC-Q100，体积仅5*5mm，性价比高，十分适合于带主机功能的雷达探头设计

UPD78F0828A型号车载无主机倒车雷达方案.png

　　优势

　　· 瑞萨车规级控制器RL78/F 系列，系统时钟支持32MHz，集成硬件乘除法器，符合车载倒车雷达对主控MCU计算速率的要求;集成4通道SPI通信，1通道LIN总线与CAN总线，满足车载通信需求; 芯片支持32PIN-QFN 5*5小封装，对小体积的倒车雷达来讲布板更方便;静态功耗低至0.47uA，通过AEC-Q100认证的车规级芯片，满足车用零配件的设计要求;批量备货，性价比优。

RL78/F14

The successors to the 78K0R and R8C, with the industry's lowest level of consumption current. Due to high reliability and built-in motor control functions, these automotive general-purpose low-end microcontrollers can be used not only for automotive applications but also industrial applications.

RL78/F14 microcontrollers are positioned as the upper level product to the RL78/F13, are available in a 30 to 100-pin, 48 to 256 KB flash memory lineup, and realize the industry's lowest level of consumption current. They have a built-in CAN module and LIN module for automotive interfaces, and also support BLDC motor control using the RL78/F13's functional safety features, timer RD, comparator, and D/A converter. Since a highly reliable system can be built, these microcontrollers can be used for industrial applications and of course automotive applications.

Key Features:

Remark : Only to show different point

ITEM			RL78/F14
Part Name			R5F10PA	R5F10PB	R5F10PG	R5F10PL	R5F10PM
Pins			30	32	48	64	80
I/O Port	In / Out	CMOS	23 channels	25 channels	38 channels	52 channels	68 channels
	Output	CMOS	-		1 channel
	Input	Clock pin	2 channels		4 channels
	Input	Input	1 channel
Power supply pins		For internal	VDD, VSS, REGC
		For I/O port	-		EVDD0, EVSS0
		For I/O port	-		EVDD0, EVSS0
		For analog	VDD, VSS （AVREFP, AVREFM）
External Interrupt	Flash over 96 KB		(No applicable products)		14 channels	15 channels	16 channels
External Interrupt	Flash up to 96 KB		9 channels		13 channels	14 channels
Key Return			8 channels	6 channels	8 channels
Data Transfer Control (DTC)			37 sources		38 / 44 sources
Timer Array Unit	Flash over 96 KB		(No applicable products)		16-bit x (8 channels x 2)
Timer Array Unit	Flash up to 96 KB		16-bit x (8 + 4) channels		16-bit x (8 + 4) channels
Serial Interface	CSI / SimpleI²C / UART		3 channels / 3 channels / 2 channels		4 channels / 4 channels / 2 channels
	Multi-master I²C		-	1 channel
	LIN / UART		1 channel		2 channels for Flash over 96 KB product and 1 channel for Flash up to 96 KB product
	CAN		1 channel
10-bit A/D Converter		External	12 channels (Note 1)	10 channels (Note 1)	15 / 18 channels (Note 1, 2)	19 / 20 channels (Note 1, 2)	20 / 25 channels (Note 1, 2)
10-bit A/D Converter		Internal	2 channels
Event Link Controller (ELC)			Link source : 20 channels Link destination : 7 channels		Link source : 26 channels Link destination : 7 / 9 channels (Note 2)
PCL / Buzzer			-		1 channel
Sub oscillator			-		32.768 kHz
Operating temperature			-40 to +105 °C (grade L) / -40 to +125 °C (grade K) / -40 to +150 °C (grade Y)

(Note 1) These are the are maximum achievable A/D converter channels.

For the specified accuracy for each channel,please refer to the data sheet.

(Note 2) a / b channels (a : Flash up to 96 KB products, b : Flash 128 to 256 KB products)

Pin Count / Memory Size Lineup:

Program Flash
SRAM　

256KB 20KB			●	●	●	●
192KB 16KB			●	●	●	●
128KB 10KB			●	●	●	●
96KB 8KB			●	●	●	●
64KB 6KB	●	●	●	●	●	●
48KB 4KB	●	●	●	●
Pins Package	30 LSSOP	32 HVQFN	48 LFQFP	48 HVQFN	64 LFQFP	80 LFQFP

Block Diagram:

图片.png

　　· 理光车规级R1524x,支持200mA输出电流，其高耐压可达50V，符合AEC-Q100认证，十分适用于车机电源12转5V输出;批量备货,性价比优。

【R1524x】

OUTLINE

The R1524x is an ultra-low supply current volta ge regulator featuring 200 mA output current and 36 V input voltage. T his device co nsists of an Outpu t Short-cir cuit Protect ion Circuit, an Over-current Protect ion Circuit , and a Thermal Shutdown Circuit in addition to the basic regulator circuits. The operating temperature range is from −40°C to 105°C, and the maximum input voltage is 36 V. All these features allow the R1524x to become an ideal power source of electric home appliances. The outpu t v olt ages are int er nal ly fixed at e ither of the f ollo wing : 1. 8 V, 2.5 V, 2.8 V, 3.0 V, 3.3 V, 3.4 V, 5.0 V, 5.5 V, 6.0 V, 6.4 V, 8.0 V, 8.5 V and 9.0 V. The output voltage accuracy is ±0.6%. The pac kages f or this device range from high-densit y mounting to ultra high watt age. The R1524x is offered in five pac kages; a 5-pin SO T-23-5, a 5-pin SOT-89-5, a 6-pin HSOP-6J, a 6-pin DFN(PLP)1820-6, and an 8-pin HSOP-8E package.

FEATURES ●Input Vol tage Range (Maximum Rating) ····3.5 V to 36 V (50 V)

●Operating Temperature Range ···· −40°C to 105°C

●Supply Current ··· Typ. 2.2 µA

●Standby Current ··· Typ. 0.1 µA

●Dropout Voltage ··· Typ. 0.6 V (IOUT = 200 mA, VOUT = 5.0 V)

●Output Voltage Range ·1.8 V / 2.5 V / 2.8 V / 3.0 V / 3.3 V / 3.4V /5.0 V / 5.5 V / 6.0 V / 6.4 V / 8.0 V / 8.5 V / 9.0 V *Contact Ricoh sales representatives for other voltages.

●Output V oltage Accuracy ···· ±0.6% (Ta = 25°C)

●Output Voltage Temperature-Drift Coefficient ··· Typ. ±60 ppm/°C

●Line Regulation ····· Typ. 0.01%/V (VSET + 1 V ≤ VIN ≤ 36 V)

●Built-in Output Short-cir cuit Pr otection Circui t ··· Typ. 80 mA

●Built-in Over-current Protection Circuit ··· Typ. 350 mA

●Built-in Thermal Shutdown Circuit ··· Thermal Shutdown Temperature: Typ. 160°C

●Ceramic capacitors are recommendedto be used with this device ···COUT = 0.1 μF or more

●Packages ··· SOT-23-5, SOT-89-5, HSOP-6J,DFN(PLP)1820-6, HSOP-8E

APPLICATIONS ●Power source for home appliances such as refrigerators, rice cookers, and electric hot-water pot.

●Power source for notebook PCs, digital TVs, cordless phones, and private LAN system.

●Power source for office equipment machines such as copiers, printers, facs im iles, s c anners, and proj

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