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| NCV7471系統基礎芯片汽車(chē)電控制解決方案 |
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| 文章來(lái)源： 更新時(shí)間：2014/11/6 13:07:00 |
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On Semi公司的NCV7471系統基礎芯片(SBC)集成了車(chē)體的汽車(chē)電控單元(ECU)的功能,提供和監視應用微控制器和其它負載的低壓電源,通過(guò)看門(mén)狗監視應用軟件,以及高速CAN和LIN收發(fā)器,是ECU成為多個(gè)通信節點(diǎn)或用作網(wǎng)關(guān)單元.本文介紹了NCV7471主要特性,框圖和應用框圖,以及系統基礎芯片(SBC)評估板主要特性,電路圖,材料清單和PCB設計圖.
NCV7471 is a System Basis Chip (SBC) integrating functions typically found in automotive Electronic Control Units (ECUs) in the body domain. NCV7471 provides and monitors the low-voltage power supplies for the application microcontroller and other loads, monitors the application software via a watchdog and includes high-speed CAN and LIN transceivers allowing the ECU to host multiple communication nodes or to act as a gateway unit. The on-chip state controller ensures safe power-up sequence and supports low-power modes with a configurable set of features including wakeup from the communication buses or by a local digital signal WU. The status of several NCV7471 internal blocks can be read by the microcontroller through the serial peripheral interface or can be used to generate an interrupt request.
NCV7471主要特性:
Control Logic
- Ensures safe powerup sequence and the correct reaction to different supply conditions
- Controls mode transitions including the power management and wakeup treatment bus
wakeups, local wakeups (via WU pin) and cyclic wakeups (through the onchip timer)
- Generates reset and interrupt requests
Serial Peripheral Interface
- Operates with 16bit frames
- Ensures communication with the ECUs microcontroller unit
- Mode settings, chip status feedback and watchdog are accessible through eight twelvebits registers
5 V VOUT Supply from a DC/DC Converter
- Can deliver up to 500 mA with accuracy of 2%
- Supplies typically the ECUs microcontroller
- Suitable for start stop systems with battery voltage as low as 2.5V
5 V VOUT2 Lowdrop Output Regulator
- Can supply external loads e.g. sensors
- Controlled by SPI and the state machine
- Protected against short to the car battery
A Highspeed CAN Transceiver
- ISO11898 compliant
- TxD dominant timeout protection
Two LIN Transceivers
- LIN2.1 and J2602 compliant
- TxD dominant timeout protection
Wakeup Input WU
- Edgesensitive highvoltage input
- Can be used as a wakeup source or as a logical input polled through SPI
Protection and Monitoring Functions
- Monitoring of the main supply through the V_MID point
- Monitoring of VOUT supply output with
programmable threshold
- VOUT2 supply diagnosis through SPI and interrupt
- Thermal warning and thermal shutdown protection
- Programmable watchdog monitoring the ECU software
Automotive Body Control Modules
圖1. NCV7471框圖
圖2. NCV7471應用框圖
NCV7471系統基礎芯片(SBC)評估板
This document describes the NCV7471 EVB board for the ON Semiconductor NCV7471 System basis chip with a high−speed CAN and two LIN transceivers with boost−buck converter and low−drop voltage regulator. The functionality and major parameters can be evaluated with the NCV7471 EVB board.
NCV7471 is a System Basis Chip (SBC) integrating functions typically found in automotive Electronic Control Units (ECUs) in the body domain. NCV7471 provides and monitors the low−voltage power supplies for the application microcontroller and other loads, monitors the application software via a watchdog and includes high−speed CAN and LIN transceivers allowing the ECU to host multiple communication nodes or to act as a gateway unit. The on−chip state controller ensures safe power−up sequence and supports low−power modes with a configurable set of features including wakeup from the communication buses or by a local digital signal WU. The status of several NCV7471 internal blocks can be read by the microcontroller through the serial peripheral interface or can be used to generate an interrupt request.
NCV7471系統基礎芯片(SBC)評估板主要特性:
• One−row Pin Header, Providing the Circuit Signals, Enables Easy Insertion of the Evaluation Board into a more Complex Application Setup
• Oscilloscope Test−points on All Important Signals
• Reverse Protection and Decoupling on the Main (Battery) Supply
• All the Necessary VOUT Converter External Components – Assembly Options Available
• Decoupling on VOUT Converter and VOUT2 Regulator Outputs
• Additional Pull−up Resistors on the Open−drain Digital Outputs (RSTN, INTN, UVN_VOUT)
• Filtering Circuit on the Switch−monitoring WAKE Input
• On−board Local Wakeup Switch
• CAN/LIN−bus Terminations
• Good Thermal Connection of the Circuit’s Exposed Pad to the Bottom Ground Plane
• Basic Standalone Functionality using Software Development Mode
圖3. NCV7471系統基礎芯片(SBC)評估板外形圖
圖4. NCV7471系統基礎芯片(SBC)評估板電路圖
NCV7471系統基礎芯片(SBC)評估板材料清單(BOM):
圖5. NCV7471系統基礎芯片(SBC)評估板PCB設計圖(1)
圖6. NCV7471系統基礎芯片(SBC)評估板PCB設計圖(2) |
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