Microchip Technology has expanded its powerful PIC18CXXX microcontrollers for 8 and 16 bit applications with the PIC18CX58 controller area network (CAN) family, the first PICmicro family targeting automotive and industrial applications with an on-board CAN solution. The 68-pin PIC18C658 and the 84-pin PIC18C858 offer 32 KB of OTP program memory and 1536 bytes of user RAM and feature CAN 2.0B active peripheral interface and OTP memory options for maximum design flexibility.
The two devices complement Microchip's new high performance PIC18CXXX core by combining a 10 MIPS CPU and 32 KB of program memory with an intelligent CAN interface, allowing complex control algorithms and network interfaces to be executed on the same microcontroller. Traditionally, two 8 bit microcontrollers have been required to accomplish the same task. PICmicro users can seamlessly migrate their existing design to the higher performance CAN solution with minimal development resources.
The CAN interface contains a double-buffered receiver with two priority levels, six full acceptance filters, and two acceptance masks. Three transmit buffers are available for application-specified prioritisation and abort filter. Other CAN interface features include programmable wake-up to manage power consumption, an integrated low-pass filter to minimise false starts from noise, a programmable loop-back mode to support self-test operation, a programmable baud rate clock source and a programmable link to timer module for time-stamping and network synchronisation.
CAN is becoming very popular in industrial control applications, making the PIC18C658 and PIC18C858 attractive solutions for many industrial control applications, such as medical, electro-surgical instruments, heating, air conditioning, etc.
In addition to the CAN interface, the PIC18C658 and PIC18C858 microcontrollers provide many high-performance peripherals for local device control, including a 9 bit addressable RS485 type USART, I2CT or SPIT communications capability for peripheral expansion; selectable oscillator; and two capture/compare/pulse-width-modulation (CCP) modules. The devices contain three 16 bit timers, one 8 bit timer, a watchdog timer, and 52 and 68 I/O bi-directional ports. Analog peripherals include a 10 bit ADC, two comparators with programmable voltage reference, programmable brownout detect, and programmable low-voltage detect.
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