原标题：Atmel ATA663254汽车LIN网络解决方案

　　Atmel公司的ATA663254是全集成的LIN收发器,设计满足LIN标准2.0, 2.1, 2.2, 2.2A和 SAEJ2602-2,并集成了低压降的5V/85mA稳压器,电源电压高达40V,工作电压5V-28V,睡眠模式电流9uA.本文介绍了ATA663254主要特性,框图和典型应用电路,以及评估板ATAB663254A-V1.2主要特性,电路图,材料清单和PCB布局图.

　　The Atmel® ATA663254 system basis chip is a fully integrated LIN transceiver, designed according to the LIN specification 2.0, 2.1, 2.2, 2.2A and SAEJ2602-2, with a low-drop voltage regulator 5V/85mA. The combination of voltage regulator and bus transceiver makes it possible to develop simple but powerful slave nodes in LIN bus systems. Atmel ATA663254 is designed to handle the low-speed data communication in vehicles (for example, in convenience electronics). Improved slope control at the LIN driver ensures secure data communication up to 20Kbaud. The bus output is designed to withstand high voltage. Sleep mode and silent mode guarantee minimized current consumption even in the case of a floating or a shorted LIN bus.

　　The voltage regulator is a fully integrated low-drop voltage regulator, with 5V output voltage and 85mA current capability. It is especially designed for the automotive environment. A key feature is that the current consumption is always below 170μA (without load), even if the supply voltage is below the regulator’s nominal output voltage.

　　ATA663254主要特性:

　　● Supply voltage up to 40V

　　● Operating voltage VS = 5V to 28V

　　● Supply current

　　● Sleep mode: typically 9μA

　　● Silent mode: typically 47μA

　　● Very low current consumption at low supply voltages (2V < VS < 5.5V): typically 130μA

　　● Linear low-drop voltage regulator, 85mA current capability

　　● MLC(2) capacitor with 0Ω ESR

　　● Normal, fail-safe, and silent mode

　　● VCC = 5.0V ±2%

　　● Sleep mode: VCC is switched off

　　● Works down to VS = 2.3V

　　● VCC undervoltage detection with open drain reset output (NRES, 4ms reset time)

　　● Voltage regulator is short-circuit and over-temperature protected

　　● LIN physical layer according to LIN 2.0, 2.1, 2.2, 2.2A and SAEJ2602-2

　　● Wake-up capability via LIN bus (100μs dominant)

　　● Wake-up source recognition

　　● TXD time-out timer

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

　　● Advanced EMC and ESD performance

　　● Fulfills the OEM “Hardware Requirements for LIN in Automotive Applications Rev.1.3”

　　● Interference and damage protection according to ISO7637

　　● Package: DFN8

　　图1. ATA663254框图

　　图2. ATA663254典型应用电路图

　　评估板ATAB663254A-V1.2

　　ATAB663254A-V1.2 is an evaluation tool for a quick start with Atmel’s 4th generation LIN SBC including LIN transceiver + low drop 5V/85mA voltage regulator enabling easy prototyping and testing.

　　评估板ATAB663254A-V1.2主要特性:

　　● All components necessary to support the ATA663254

　　● All pins easily accessible

　　● Choice of master or slave operation (D2 and R2 mounted per default for master operation)

　　● Switching into normal, silent or sleep mode via two jumpers

　　● LEDs for operation indication

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

　　图3. 评估板ATAB663254A-V1.2外形图

　　评估板ATAB663254A-V1.2材料清单: