原标题：Atmel ATA6616汽车LIN网络总线设计方案

　　Atmel公司的ATA6616C/ATA6617C是系统级封装(SiP)器件,一个封装内有两个IC: LINsystem系统芯片(LIN-SBC)(ATA6624)和汽车MCU ATtiny87/ATtiny167。主要用在汽车LIN网络.本文介绍了ATA6616C/ATA6617C通用特性, LIN-SBC区块主要特性和框图, ATtiny87/ATtiny167 MCU区块主要特性和框图,典型应用电路以及ATA6616/ATA6617-EK开发板主要特性,电路图,材料清单和PCB元件布局图.

　　Atmel ATA6616C/ATA6617C is a System-in-Package (SiP) product, which is particularly suited for complete LIN-bus node applications. It consists of two ICs in one package supporting highly integrated solutions for in-vehicle LIN networks. The first chip is the LINsystem-basis-chip (LIN-SBC) ATA6624, which has an integrated LIN transceiver, a 5V regulator (85mA) and a window watchdog. The second chip is an automotive microcontroller from Atmel’s series of AVR 8-bit microcontroller with advanced RISC architecture, the Atmel ATtiny87 with 8-Kbytes and the Atmel ATtiny167 with 16-Kbytes flash memory.

　　All pins of the LIN system basis chip as well as all pins of the AVR microcontroller are bonded out to provide customers the same flexibility for their applications as they have when using discrete parts.

　　ATA6616C/ATA6617C通用特性:

　　● Single-package high performance, low power AVR® 8-bit microcontroller with LIN transceiver, 5V regulator (85mA current capability) and watchdog

　　● Very low current consumption in sleep mode

　　● 8Kbytes/16Kbytes flash memory for application program (Atmel® TA6616C/ATA6617C)

　　● Supply voltage up to 40V

　　● Operating voltage: 5V to 27V

　　● Temperature range: Tcase –40℃ to +125℃

　　● QFN38, 5mm ×7mm package

　　LIN-SBC (LIN System-basis-chip)区块

　　The LIN-SBC is a fully integrated LIN transceiver, which complies with the LIN 2.0, 2.1 and SAEJ2602-2 specifications. It has a low-drop voltage regulator with a 5V/85mA output and a window watchdog. The voltage regulator is able to source up to 85mA, but if necessary the output can be boosted by an external NPN transistor.

　　The LIN-SBC is designed to handle the low-speed data communication in vehicles, e.g., in convenience electronics. Improved slope control at the LIN-driver ensures secure data communication up to 20kBaud. Sleep mode and silent mode guarantee very low current consumption.

　　LIN-SBC区块主要特性:

　　● Master and slave operation possible

　　● Supply voltage up to 40V

　　● Operating voltage VS = 5V to 27V

　　● Typically 10μA supply current during sleep mode

　　● Typically 57μA supply current in silent mode

　　● Linear Low-drop voltage regulator, 85mA current capability:

　　● Normal, fail-safe, and silent mode

　　● VCC = 5.0V ±2%

　　● In sleep mode VCC is switched off

　　● VCC undervoltage detection (4ms reset time) and watchdog reset logical combined at open drain output NRES

　　● Negative trigger input for watchdog

　　● Boosting the voltage regulator possible with an external NPN transistor

　　● LIN physical layer according to LIN 2.0, 2.1 specification and SAEJ2602-2

　　● Wake-up capability via LIN-bus, wake pin, or Kl_15 pin

　　● INH output to control an external voltage regulator or to switch off the master pull-up resistor

　　● TXD time-out timer

　　● Bus pin is overtemperature and short-circuit protected versus GND and battery

　　● Adjustable watchdog time via external resistor

　　● Advanced EMC and ESD performance

　　● Fulfills the OEM “Hardware Requirements for LIN in Automotive Applications Rev.1.0”

　　● Interference and damage protection according to ISO7637

　　图1. LIN-SBC区块框图

　　Atmel ATtiny87/ATtiny167 MCU区块:

　　ATtiny87/ATtiny167 MCU区块主要特性:

　　● High performance, low power AVR® 8-bit microcontroller

　　● Advanced RISC architecture

　　● 123 powerful instructions – most single clock cycle execution

　　● 32 × 8 general purpose working registers

　　● Fully static operation

　　● Non-volatile program and data memories

　　● 8Kbytes/16Kbytes of in-system programmable (ISP) program memory flash

　　● Endurance: 10,000 write/erase cycles

　　● 512 bytes in-system programmable EEPROM

　　● Endurance: 100,000 write/erase cycles

　　● 512 bytes internal SRAM

　　● Programming lock for self-programming flash program and EEPROM data security

　　● Low size LIN/UART software in-system programmable

　　● Peripheral features

　　● LIN 2.1 and 1.3 controller or 8-bit UART

　　● 8-bit asynchronous Timer/Counter0:

　　● 10-bit clock prescaler

　　● 1 output compare or 8-bit PWM channel

　　● 16-bit synchronous Timer/Counter1:

　　● 10-bit clock prescaler

　　● External event counter

　　● 2 output compares units or 16-bit PWM channels each driving up to 4 output pins

　　● Master/slave SPI serial interface,

　　● Universal serial interface (USI) with start condition detector (master/slave SPI, TWI,...)

　　● 10-bit ADC:

　　● 11 Single ended channels

　　● 8 differential ADC channel pairs with programmable gain (8x or 20x)

　　● On-chip analog comparator with selectable voltage reference

　　● 100μA ±10% current source (LIN node identification)

　　● On-chip temperature sensor

　　● Programmable watchdog timer with separate on-chip oscillator

　　● Special microcontroller features

　　● Dynamic clock switching (external/internal RC/watchdog clock) for power control, EMC reduction

　　● DebugWIRE on-chip debug (OCD) system

　　● Hardware in-system programmable (ISP) via SPI Port

　　● External and internal interrupt sources

　　● Interrupt and wake-up on pin change

　　● Low power idle, ADC noise reduction, and power-down modes

　　● Enhanced power-on reset circuit

　　● Programmable brown-out detection circuit

　　● Internal calibrated RC oscillator 8MHz

　　● 4MHz to 16MHz and 32KHz crystal/ceramic resonator oscillators

　　● I/O and Packages

　　● 16 programmable I/O lines

　　● 20-pin SOIC, 32-pad QFN and 20-pin TSSOP

　　● Operating voltage:

　　● 2.7V to 5.5V for Atmel® ATtiny87/ATtiny167

　　● Speed Grade:

　　● 0MHz to 8MHz at 2.7V to 5.5V (automotive temperature range: –40°C to +125°C)

　　● 0MHz to 16MHz at 4.5V to 5.5V (automotive temperature range: –40°C to +125°C)

　　图2. ATtiny87/ATtiny167 MCU区块框图

　　图3. ATA6616C/ATA6617C典型LIN从应用电路

　　图4. ATA6616C/ATA6617C典型LIN主应用电路

　　图5. ATA6616C/ATA6617C典型LIN主应用电路:睡眠和静默模式时1K欧姆LIN主上拉已关掉

　　图5. ATA6616C/ATA6617C最少外接元件的LIN从应用电路

　　图6.采用 ATA6616C/ATA6617C的3x3 LIN从开关模块矩阵译码器

　　ATA6616/ATA6617-EK开发板

　　The development board for the Atmel® ATA6616/ATA6617 ICs enables users to rapidly prototyping and testing of new LIN designs on the Atmel ATA6616 and Atmel ATA6617 ICs.

　　图7. ATA6616/ATA6617-EK开发板外形图

　　ATA6616/ATA6617-EK开发板主要特性:

　　● All components necessary to put the ATA6616/ATA6617 into operation are included

　　● Placeholders for some optional components for extended functions included

　　● All pins easily accessible

　　● Easily adaptable watchdog times by replacing a single resistor

　　● Optional activation of external NPN transistor for boosting output current of voltage regulator (removing jumper JP3)

　　● Choice of master or slave operation (mounting D2 and R1)

　　● Optional external quartz mounted for handling time-critical applications (not necessary for LIN communication)

　　● Push button included for creating local wake-up after entering Sleep or Silent Mode

　　● Ground coulter clip for easy probe connection while measuring with oscilloscope

　　ATA6616-EK/ATA6617-EK开发板材料清单: