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TCAN3413 Datasheet(PDF) 27 Page - Texas Instruments |
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TCAN3413 Datasheet(HTML) 27 Page - Texas Instruments |
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27 / 45 page  8.3 System Examples The TCAN341x CAN transceiver is typically used in applications with a host controller or FPGA that includes the link layer portion of the CAN protocol. A 1.8-V or 2.5-V application is shown in Figure 8-7. The bus termination is shown for illustrative purposes. 1.8 V / 2.5 V Regulator TCAN3413 STB RXD TXD CANH CANL VCC Port x RXD TXD 3.3 V Voltage Regulator VIN VOUT GND VIN Optional: Terminating Node Optional: Filtering, Transient and ESD MCU VDD VIO CAN FD Controller 8 4 1 3 7 6 VIN VOUT 5 Figure 8-7. Typical Transceiver Application Using 1.8-V, 2.5-V I/O Connections 8.3.1 ISO 11898-2 Compatibility of TCAN341x Family of 3.3-V CAN Transceivers 8.3.1.1 Introduction Many users value the low power consumption of operating their CAN transceivers from a 3.3-V supply. However, some are concerned about the interoperability with 5 V supplied transceivers on the same bus. This section tries to address those concerns. 8.3.1.2 Differential Signal CAN is a differential bus where complementary signals are sent over two wires and the voltage difference between the two wires defines the logical state of the bus. The differential CAN receiver monitors this voltage difference and outputs the bus state with a single ended logic level output signal. The CAN driver creates the differential voltage between CANH and CANL in the dominant state. The dominant differential output of the TCAN341x is greater than 1.5 V and less than 3 V across a 60-Ω load as defined by the ISO 11898-2 standard. These are the same limiting values for 5 V supplied CAN transceivers. The bus termination resistors drive the recessive bus state and not the CAN driver. A CAN receiver is required to output a recessive state when less than 500 mV of differential voltage exists on the bus, and a dominant state when more than 900 mV of differential voltage exists on the bus. The CAN receiver must do this with common-mode input voltages from –12 V to 12 V. The TCAN341x device receivers meet and exceed these receiver input specifications. 8.3.1.3 Common-Mode Signal A common-mode signal is an average voltage of the two signal wires that the differential receiver rejects. The common-mode signal comes from the CAN driver, ground noise, and coupled bus noise. The TCAN341x family has the recessive bias voltage set to 1.9V. This is intentional to match the common mode of recessive output with the common mode of dominant output signal from TCAN341x. Furthermore, TCAN341x has special design techniques for optimum EMC performance in a heterogeneous bus consisting of TCAN341x and 5 V CAN transceivers. www.ti.com TCAN3413, TCAN3414 SLLSFS8A – MARCH 2023 – REVISED NOVEMBER 2023 Copyright © 2023 Texas Instruments Incorporated Submit Document Feedback 27 Product Folder Links: TCAN3413 TCAN3414 |
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