MICROCONTROLLER SOLUTIONS

ARM7-Based Automotive Microcontrollers Feature CAN and LIN

Philips Semiconductors’ SJA2020 32-bit, 60MHz ARM7-based automotive microcontrollers feature integrated Controller Area Network (CAN) and Local Interconnect Network (LIN) functionality. The SJA2020 is aimed at In-Vehicle Network (IVN) gateway applications.



The combination of processing power provided by the ARM7 core and the flexibility of on-chip CAN and LIN gateway functionality allows the SJA2020 to satisfy the computing and memory requirements of complex IVNs. Furthermore, the device allows design engineers to reduce component count and centralise communications in IVN systems by replacing several 8-bit microcontrollers with one 32-bit microcontroller to control gateway and general purpose applications in the car, including central door locks and power windows.

By offering both CAN and LIN nodes on a single chip, the SJA2020 enables applications within the vehicle to communicate across different in-vehicle serial bus systems. This provides car manufacturers with a cost-effective and flexible solution for implementing an IVN gateway for applications that demand the performance of a 32-bit microcontroller.

Additional features of the SJA2020 include 384kBytes of embedded Flash memory and support for up to six CAN channels and four LIN masters, providing designers with the highest level of flexibility in terms of implementation and customisation of the gateway, and enabling high performance network communication with minimum CPU load.

Hardware IP blocks based on Philips’ CAN experience enable optimised receiving, composing, routing and transmission of network messages on different serial bus systems. A unique ‘global acceptance filter’ services all CAN controllers with a scanning algorithm, ensuring extremely short transfer-latency times.

All CAN channels are CAN 2.0B compliant and feature receive FullCAN mode and triple transmit buffers. The SJA2020 is the ideal product for high performance gateways, due to its short transfer latency time, as well as for general purpose CAN applications, thanks to its enhanced receive FullCAN mode and its support for large number of CAN identifiers. Philips CAN gateway offers the ideal balance: Hardware is used for all time critical functions while software is used when flexibility is needed.

The Philips LIN master controller requires only about 10% of the CPU load compared to the standard UART, and the number of interrupts per LIN message frame is reduced to 1. All LIN channels are LIN 2.0 compliant, as well as SAE J2602 complaint.

Three SPI interfaces and an external bus interface allow fast access to multimedia networks such as MOST or IDB-1394.

Features: SJA2020

• 60MHz 32-bit ARM7 microcontroller
• Fully qualified to AEC Q100 standard
• 384kByte embedded Flash with source code protection and 4Mbit/s fast programming
• 24kByte SRAM
• Six CAN channels with global acceptance
• Four LIN master controllers implemented in hardware
• Four industry-standard ‘450’ UARTs and one ‘550’ UART
• Four-channel 10-bit A/D converter
• Real time clock with on-chip 32kHz crystal oscillator
• Three full-duplex SPI
• 32-bit watchdog with timer change protection
• External 8-, 16- or 32-bit bus with four memory banks
• Up to 94 general-purpose I/Os
• Dual Supply: CPU 1.8V ±5%; I/O 2.7V to 3.6V, 5V-tolerant
• On-board ring oscillator for advanced power saving modes
• LQFP 144-pin package

For further information, including the IVN Development Newsletter and SJA2020 Datasheet, please click here