CONTROL AREA NETWORK (CAN) TRANSCEIVERS WITH AUTOMATIC POLARITY DETECTION
First Claim
1. A control area network (CAN) bus integrated circuit comprising:
- CAN bus high and low terminals;
a receive data terminal;
a first CAN bus transceiver having normal and standby modes;
a second CAN bus transceiver having normal and standby modes; and
output circuitry coupled to the receive data terminal, to the CAN bus high and low terminals and providing a output CAN bus receive data signal from the one of the first and second CAN bus transceivers in normal mode to the receive data terminal.
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Accused Products
Abstract
Two CAN bus transceivers utilized in a single integrated circuit package with the CAN bus connections between the two transceivers being inverted. Thus, one transceiver is connected to the CAN bus high and low lines while the other transceiver is connected to the CAN bus low and high lines. Both transceivers power up in a standby condition and each transceiver is monitoring for wake up signals on the CAN bus. The transceiver that is correctly connected to the CAN bus detects wake up signals. When the wake up signals are detected at that transceiver, that transceiver is brought to full operating state and the other transceiver is placed in a full standby condition. Additional input resistance is provided with each transceiver to maintain the proper input resistance for the integrated circuit.
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12 Claims
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1. A control area network (CAN) bus integrated circuit comprising:
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CAN bus high and low terminals; a receive data terminal; a first CAN bus transceiver having normal and standby modes; a second CAN bus transceiver having normal and standby modes; and output circuitry coupled to the receive data terminal, to the CAN bus high and low terminals and providing a output CAN bus receive data signal from the one of the first and second CAN bus transceivers in normal mode to the receive data terminal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control area network (CAN) bus controller comprising:
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a microcontroller; a CAN bus connector for receiving CAN bus high and low lines; one of a controller input or a controller output coupled to the microcontroller; and a CAN bus integrated circuit coupled to the microcontroller and to the CAN bus connector, the CAN bus integrated circuit including; CAN bus high and low terminals coupled to the CAN bus connector; a receive data terminal coupled to the microcontroller; a first CAN bus transceiver having normal and standby modes; a second CAN bus transceiver having normal and standby modes; and output circuitry coupled to the receive data terminal and providing a output CAN bus receive data signal from the one of the first and second CAN bus transceivers in normal mode to the receive data terminal. - View Dependent Claims (8, 9, 10, 12)
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Specification