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| 美芯电动窗户防夹系统参考设计 | |||||
作者：赵伟庆 王… 文章来源：单片机及嵌入式系统应用 点击数： 更新时间：2007-11-7  |
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Microchip Window Lift w/Anti-Pinch Reference Design Looking for a flexible, cost effective solution for Window Lift with Anti-Pinch? The APGRD002 Window Lift Reference Design maybe just what you are looking for. This kits features the PIC16F688, a 14 pin device, with a Full H-Bridge controller, 10-bit ADC and an integrated LIN Protocol module. This feature set combines to make an ideal solution for Window Lift applications. The H-Bridge controller and the 10-bit ADC coupled to provide bidirectional motor control with active feedback for implementing the Anti-Pinch functionality. The Integrated LIN Protocol Module allows for intersystem communication with in the door module as well as the main body controller.  APGRD002的主要特性: The APGRD002 Reference Design Kit consists of a microcontroller, 5 volt regulator, relays and drivers, input conditioning circuitry, and network physical layer interface. All documentation is available on the CD-ROM for APRD002;Firmware, Schematics, Gerber files, Assemble Diagrams and BOM Firmware is designed for a Window Lift with Anti-Pinch application The APGRD002 Reference Design serves as a target board for LIN bus communication. Switch inputs, as well as LIN commands, can be used to control the two output relays for driving an H-bridge Motor configuration or a simple Servo circuit. 一.带电压稳压器的MCP201 LIN 收发器性能介绍 The MCP201 provides a physical interface between a microcontroller and a LIN half-duplex bus. It is intended for automotive and industrial applications with serial bus speeds up to 20 Kbaud. The MCP201 provides a half-duplex, bidirectional communications interface between a microcontroller and the serial network bus. This device will translate the CMOS/TTL logic levels to LIN level logic, and vice versa. The LIN specification 1.3 requires that the transceiver of all nodes in the system be connected via the LIN pin, referenced to ground and with a maximum external termination resistance of 510from LIN bus to battery supply. The 510corresponds to 1 Master and 16 Slave nodes. The MCP201 provides a +5V 50 mA regulated power output. The regulator uses a LDO design, is shortcircuit- protected and will turn the regulator output off if it falls below 3.5V. The MCP201 also includes thermal shutdown protection. The regulator has been specifically designed to operate in the automotive environment and will survive reverse battery connections, +40V load dump transients and double-battery jumps. 主要特性: Supports baud rates up to 20 Kbaud 40V load dump protected Wide supply voltage, 6.0 – 18.0V, continuous - Maximum input voltage of 30V Extended Temperature Range: -40°C to +125°C Interface to standard USARTs Compatible with LIN Spec 1.3 Local Interconnect Network (LIN) Line pin: Internal pull-up resistor and diode - Protected against ground shorts (LIN pin to ground) - Protected against LIN pin loss of ground - High current drive, 40 mA ≤IOL ≤200 mA Automatic thermal shutdown On-board Voltage Regulator: - Output voltage of 5V with ±5% tolerances over temperature range - Maximum output current of 50 mA - Able to drive an external series-pass transistor for increased current supply capability - Internal thermal overload protection - Internal short-circuit current limit - External components limited to filter capacitor only and load capacitor  图2. MCP201方框图.  图3. MCP201的应用电路图. 二.PIC16F688 性能介绍 14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology 高性能RISC CPU Only 35 instructions to learn: - All single-cycle instructions except branches Operating speed: - DC – 20 MHz oscillator/clock input - DC – 200 ns instruction cycle Interrupt capability 8-level deep hardware stack Direct, Indirect and Relative Addressing modes 特殊的微控制器特性: Precision Internal Oscillator: - Factory calibrated to ±1% - Software selectable frequency range of 8 MHz to 31 kHz - Software tunable - Two-Speed Start-up mode - Crystal fail detect for critical applications - Clock mode switching during operation for power savings Power saving Sleep mode Wide operating voltage range (2.0V-5.5V) Industrial and Extended temperature range Power-on Reset (POR) Power-up Timer (PWRT) and Oscillator Start-up Timer (OST) Brown-out Detect (BOD) with software control option Enhanced Low-Current Watchdog Timer (WDT) with on-chip oscillator (software selectable nominal 268 seconds with full prescaler) with software enable Multiplexed Master Clear with pull-up/input pin Programmable code protection High-Endurance Flash/EEPROM cell: -100,000 write Flash endurance -1,000,000 write EEPROM endurance -Flash/Data EEPROM retention: > 40 years 低功耗特性: Standby Current: - 1 nA @ 2.0V, typical Operating Current: - 8.5A @ 32 kHz, 2.0V, typical - 100A @ 1 MHz, 2.0V, typical Watchdog Timer Current: - 1A @ 2.0V, typical 外设特性: 12 I/O pins with individual direction control: - High-current source/sink for direct LED drive - Interrupt-on-pin change - Individually programmable weak pull-ups - Ultra Low-Power Wake-up Analog comparator module with: - Two analog comparators - Programmable on-chip voltage reference (CVREF) module (% of VDD) - Comparator inputs and outputs externally accessible A/D Converter: - 10-bit resolution and 8 channels Timer0: 8-bit timer/counter with 8-bit programmable prescaler Enhanced Timer1: - 16-bit timer/counter with prescaler - External Gate Input mode - Option to use OSC1 and OSC2 in LP mode as Timer1 oscillator if INTOSC mode selected Enhanced USART Module: - Supports RS-485, RS-232, and LIN 1.2 - Auto baud detect - Auto-wake-up on Start bit In-Circuit Serial Programming™ (ICSP™) via two pins  align=center>图4.PIC16F6888方框图。  图5.参考设计电图 |
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