IO-Link Transceiver Integrated Polarity Protection Circuit
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Solution Overview
Problem
Existing IO-Link transceivers require external passive components for protection against inverted polarity connections, leading to increased costs and power losses due to the use of diodes and Zener diodes, which also occupy significant silicon area and reduce power efficiency.
Innovation Solution
A transceiver with an integrated protection circuit using high-side and low-side legs of P-type and N-type transistors, respectively, connected between the input/output pin and supply pins, along with a voltage clamper to prevent current circulation in case of incorrect polarity connections, eliminating the need for external components and reducing power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external passive components (diodes, Zener diodes) are used for protection against inverted polarity connections, then protection reliability is improved, but device cost increases and power losses occur
Solution Approach 1:
The protection circuit is merged with the output stage of the transceiver, integrating the protection function into the existing circuit blocks rather than using separate external components. This combines the protection functionality with the driver circuit, eliminating the need for external passive components while maintaining protection reliability.
Solution Approach 2:
The protection function is extracted from the traditional external component implementation and reimplemented using the transceiver's internal transistor structures. The body diodes of the output transistors are utilized for protection, removing the need for external diodes and Zener diodes.
2Reliability
If external passive components are used for protection, then protection functionality is achieved, but device complexity increases due to additional components
Solution Approach 1:
The protection circuit is merged with the output stage of the transceiver, integrating the protection function into the existing circuit blocks rather than using separate external components. This combines the protection functionality with the driver circuit, eliminating the need for external passive components while maintaining protection reliability.
3Reliability
If diodes are connected in series to the positive supply line for protection, then protection against inverted polarity is improved, but power efficiency decreases due to increased power losses
Solution Approach 1:
The protection function is extracted from the traditional external component implementation and reimplemented using the transceiver's internal transistor structures. The body diodes of the output transistors are utilized for protection, removing the need for external diodes and Zener diodes.
4Reliability
If passive components are used for protection, then protection circuit functionality is achieved, but silicon area occupied increases
Solution Approach 1:
The protection circuit is merged with the output stage of the transceiver, integrating the protection function into the existing circuit blocks rather than using separate external components. This combines the protection functionality with the driver circuit, eliminating the need for external passive components while maintaining protection reliability.
Solution Approach 2:
The protection function is extracted from the traditional external component implementation and reimplemented using the transceiver's internal transistor structures. The body diodes of the output transistors are utilized for protection, removing the need for external diodes and Zener diodes.
Data Source
AI summary
A transceiver is connectable to a cable with at least three wires. The transceiver may include a controlled output stage including a high-side leg, having two P-type transistors coupled in series and having a common current terminal, coupled between an output pin and a positive supply pin. The P-type transistors have body regions coupled to the common current terminal of the high-side leg. A low-side leg, includes two N-type transistors coupled in series and having a common current terminal, coupled between the output pin and a negative supply pin. The N-type transistors have body regions coupled to the common current terminal of the low-side leg. The protection circuit also includes a voltage clamper coupled between the common current terminals.