微芯MCP202x LIN半双工通信方案

微芯(Microchip)公司的MCP202x是LIN/J2602收发器,包括有内置电压稳压器(5V 50mA或3.3V 50mA),和LIN Bus 2.0/2.1 以及SAE J2602标准兼容.工作电压6.0-18V,输入电压最大为30V,工作温度-40度到125度C.支持和LIN兼容输出驱动器(20 Kbaud)以及和ISO9141兼容的驱动器(50 Kbaud). MCP202x广泛应用在汽车电子,工业,医疗和家用电器市场.本文介绍了MCP202x的主要特性,方框图和典型应用电路以及PICDEM™ CAN-LIN 3 开发板方框图和详细电路图.

The MCP202x provides a bidirectional, half-duplex communication physical interface to automotive, and industrial LIN systems to meet the LIN bus specification Revision 2.0. The device incorporates a voltage regulator with 5V @ 50 mA or 3.3V @ 50 mA regulated
power supply output. The regulator is short circuit protected, and is protected by an internal thermal shutdown circuit. The regulator has been specifically designed to operate in the automotive environment and will survive reverse battery connections, +43V load
dump transients, and double-battery jumps. The device has been designed to meet the stringent quiescent current requirements of the automotive industry.

MCP202X family members:
8-pin PDIP, DFN and SOIC packages:
-MCP2021-330, LIN-compatible driver,
8-pin, 3.3V regulator
-MCP2021-500, LIN-compatible driver,
8-pin, 5.0V regulator
14-lead PDIP, TSSOP and SOIC packages with RESET output:
-MCP2022-330, LIN-compatible driver, 14-pin, 3.3V regulator
-MCP2022-500, LIN-compatible driver,14-pin, 5.0V regulator
MCP202x 主要特性:
The MCP2021 and MCP2022 are compliant with LIN Bus Specifications 1.3, 2.0, and 2.1 and are compliant to SAE J2602
Support Baud Rates up to 20 Kbaud with LINcompatible output driver, 50 Kbaud with ISO9141 driver
43V load dump protected
Very low EMI meets stringent OEM requirements
Wide supply voltage, 6.0V - 18.0V continuous:
-Maximum input voltage of 30V
Extended Temperature Range: -40 to +125°C
Interface to PIC EUSART and standard USARTs
Local Interconnect Network (LIN) bus pin:
Internal pull-up resistor and diode
Protected against ground shorts
Protected against loss of ground
High current drive
Automatic thermal shutdown
On-board Voltage Regulator:
-Output voltage of 5.0V with tolerances of ±3% overtemperature range
-Available with alternate output voltage of 3.3V with tolerances of ±3% overtemperature
range
-Maximum continuous input voltage of 30V
-Internal thermal overload protection
-Internal short circuit current limit
-External components limited to filter capacitor only and load capacitor
Two low-power modes:
-Receiver on, Transmitter off, voltage regulator on (≅85 μA)
-Receiver monitoring bus, Transmitter off, voltage regulator off (≅16 μA)



图1.MCP202X方框图



图2.MCP202X典型应用电路图



图3. PICDEM CAN-LIN 3 开发板方框图



图4. 开发板电路图(1)



图5. 开发板电路图(2)



图6. 开发板电路图(3)



图7. 开发板电路图(4)



图8. 开发板电路图(5)



图9. 开发板电路图(6)



图10. 开发板电路图(7)



图11. 开发板电路图(8)