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| ATA664151 LIN系统基础芯片(SBC)开发方案 |
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| 文章来源： 更新时间：2014/11/20 9:42:00 |
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Atmel公司的ATA664151是集成了和LIN 2.1以及SAEJ2602-2兼容的LIN收发器,5V稳压器,看门狗,带高压电流源的8路高压开关接口和16位SPI的LIN系统基础芯片(SBC),工作电压5V-27V,电源电压高达40V,LIN高速模式速率高达200kBit/s,具有极好的EMC和ESD性能,主要用在汽车中LIN开关和LIN节点.本文介绍了ATA664151主要特性,框图,典型应用电路以及评估板ATAK42001-V1主要特性,电路图,材料清单和PCB元件布局图.
The Atmel® ATA664151 is a system basis chip with an eight-channel high voltage switch interface, a LIN 2.1 and SAEJ2602-2-compliant LIN transceiver, low-drop voltage regulator, and an adjustable window watchdog. The Atmel ATA664151 provides 5V output voltage with up to 80mA current capability. This chip combination makes it possible to develop inexpensive, simple, yet powerful slave and master nodes for LIN bus systems.
The Atmel ATA664151 is especially designed for LIN switch applications and includes almost the entire LIN node. They are designed to handle low data-rate communication in vehicles (such as in convenience electronics). Improved slope control at the LIN driver ensures secure data communication up to 20kBaud. Sleep Mode and Active Low-power Mode guarantee minimal current consumption even in the case of a floating bus line or a short circuit on the LIN bus to GND.
ATA664151主要特性:
● 8-channel HV switch interface with HV current sources
● Linear low-drop voltage regulator, up to 80mA current capability, VCC = 5.0V ±2%
● Fulfills the OEM “Hardware Requirements for LIN in Automotive Applications Rev.1.3”
● LIN master and slave operation possible
● Supply voltage up to 40V
● Operating voltage VS = 5V to 27V
● Internal voltage divider for VBattery sensing (±2%)
● 16-bit serial interface (daisy-chain-capable) for configuration and diagnosis
● Typically 8μA supply current during sleep mode
● Typically 35μA supply current in active low-power mode
● VCC-undervoltage detection (4ms reset time) and watchdog reset logical combined at NRES open drain output
● LIN high-speed mode up to 200kBit/s
● Adjustable watchdog timer via external resistor
● Negative trigger input for watchdog
● LIN physical layer complies with LIN 2.1 specification and SAE J2602-2
● Wake-up capability via LIN bus and CL15
● Bus pin is overtemperature and short-circuit protected versus GND and battery
● Advanced EMC and ESD performance
● Package: QFN32 5x5mm
图1. ATA664151框图
图2. ATA664151 CSx引脚差分外接电路的LIN从电路图
图3. ATA664151用于RGB-LED控制的LIN从电路图
图4. ATA664151用于小型DC马达H桥控制的LIN从电路图
图5. ATA664151 LIN从继电器驱动电路图
ATA664151评估板ATAK42001-V1
The ATAK42001-V1 evaluation kit includes the Atmel® LIN System Basis Chip ATA6641 with high-voltage switch interface. This low-cost, single-wire serial communication system for distributed electronics in vehicles is designed for body control applications, including power windows, mirrors, smart wipers, door locks, seat/roof/lighting control, lamps and indicators, dashboard instruments, steering wheels, climate and air-conditioning (HVAC) systems, motors, switch panels and sensors. The ATA6641 System Basis Chip (SBC) with an eight-channel high-voltage switch interface, a LIN2.1 and SAEJ2602-2-compliant LIN transceiver, low-drop voltage regulator and an adjustable window watchdog enables the development of inexpensive, low-end, but also powerful slave and master nodes for LIN bus systems meeting the latest OEM requirements. The kit supports flexible configuration of different I/O types (digital switch, rotary switch, LED) and is controlled by a PC-based user interface.
图6. 评估板ATAK42001-V1外形图
评估板ATAK42001-V1主要特性:
● All necessary components to put the Atmel ATA664151 into operation are included to simulate and test the real application
● LEDs connectable to all HV ports
● 1x RGB LED
● 8x push buttons
● 8x rotary switches
● All pins easily accessible
● Easily adaptable watchdog times by replacing a single resistor
● Possibility of selecting between master or slave operation (mounting D2 and R1)
● Push button included for creating a local wake-up after entering sleep mode
● Easily adaptable current level of the current sources by replacing a single resistor
● Ground coulter clip for connecting probes easily when measuring with the oscilloscope
The Interface board (Atmel ATAB0004A) has the following features:
● Easy connection to a PC (AT90USB1287 on board)
● USB interface to PC
● Atmel ATA664151 easily programmable via PC GUI
● ISP connector for on-chip ISP (in-system programming)
● JTAG connector for on-chip debugging
● Buzzer
● On-board RESET button
● On-board boot loader button to force AVR® into DFU mode at reset
● 16MHz crystal for system clock
图7. 评估板ATAK42001-V1 PC接口板电路图
图8. 评估板ATAK42001-V1电路图
图9. 评估板ATAK42001-V1 PCB顶层元件布局图
图10. 评估板ATAK42001-V1 PC接口板顶层元件布局图
图11. 评估板ATAK42001-V1 PC接口板底层元件布局图
PC接口板材料清单(BOM):
评估板ATAK42001-V1材料清单:
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