Abstract:

A high-voltage-tolerant ECAN (enhanced controller area network) driver embedded in the DSP(digital signal processor) chip is designed by employing SMIC 0.18μm CMOS technology. Based on the CAN(controller area network) bus, stacked high-voltage-tolerant driving technology and floating substrate effects are applied to achieve a high-voltage-tolerant driver in the standard CMOS process, avoiding the cost of the high-voltage process. The port voltage is introduced to the output-driver-control module, decreasing the electrostatic discharge at the output. Furthermore, in this way the electrostatic protection circuit can be spared, thus saving the chip area. The tape-out outcomes indicate that the proposed structure meets the CAN bus communication requirements. And the result of the port ESD(electrostatic discharge) sensitivity test reaches Class-3B, which satisfies the application demands.

Key words: enhanced controller area network, driver, high-voltage-tolerant, digital signal processor