SLLSEQ7E December   2015  – December 2019 TCAN330 , TCAN330G , TCAN332 , TCAN332G , TCAN334 , TCAN334G , TCAN337 , TCAN337G

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Block Diagram
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Device Options
  7. 7 Pin Configuration and Functions
    1.     Pin Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Switching Characteristics
    7. 8.7 Typical Characteristics
    8. 8.8 Typical Characteristics, TCAN330 Receiver
    9. 8.9 Typical Characteristics, TCAN330 Driver
  9. 9 Parameter Measurement Information
  10. 10Detailed Description
    1. 10.1 Overview
    2. 10.2 Functional Block Diagram
    3. 10.3 Feature Description
      1. 10.3.1 TXD Dominant Timeout (TXD DTO)
      2. 10.3.2 RXD Dominant Timeout (RXD DTO)
      3. 10.3.3 Thermal Shutdown
      4. 10.3.4 Undervoltage Lockout and Unpowered Device
      5. 10.3.5 Fault Pin (TCAN337)
      6. 10.3.6 Floating Pins
      7. 10.3.7 CAN Bus Short Circuit Current Limiting
      8. 10.3.8 ESD Protection
      9. 10.3.9 Digital Inputs and Outputs
    4. 10.4 Device Functional Modes
      1. 10.4.1 CAN Bus States
      2. 10.4.2 Normal Mode
      3. 10.4.3 Silent Mode
      4. 10.4.4 Standby Mode with Wake
      5. 10.4.5 Bus Wake via RXD Request (BWRR) in Standby Mode
      6. 10.4.6 Shutdown Mode
      7. 10.4.7 Driver and Receiver Function Tables
  11. 11Application and Implementation
    1. 11.1 Application Information
      1. 11.1.1 Bus Loading, Length and Number of Nodes
    2. 11.2 Typical Application
      1. 11.2.1 Design Requirements
        1. 11.2.1.1 CAN Termination
      2. 11.2.2 Detailed Design Procedure
      3. 11.2.3 Application Curves
    3. 11.3 System Examples
      1. 11.3.1 ISO11898 Compliance of TCAN33x Family of 3.3-V CAN Transceivers Introduction
      2. 11.3.2 Differential Signal
      3. 11.3.3 Common-Mode Signal and EMC Performance
  12. 12Power Supply Recommendations
  13. 13Layout
    1. 13.1 Layout Guidelines
    2. 13.2 Layout Example
  14. 14Device and Documentation Support
    1. 14.1 Related Links
    2. 14.2 Support Resources
    3. 14.3 Trademarks
    4. 14.4 Electrostatic Discharge Caution
    5. 14.5 Glossary
  15. 15Mechanical, Packaging, and Orderable Information

10.4.1 CAN Bus States

The CAN bus has two logical states during operation: recessive and dominant. See Figure 31 and Figure 32.

Recessive bus state is when the high resistive internal input resistors of each node's receiver bias the bus to a common mode of about 1.85 V across the bus termination resistors. Recessive is equivalent to logic high and is typically a differential voltage on the bus of about 0 V. Recessive state is also the idle state.

Dominant bus state is when the bus is driven differentially by one or more drivers. Current is induced to flow through the termination resistors and generate a differential voltage on the bus. Dominant is equivalent to logic low and is a differential voltage on the bus greater than the minimum threshold for a CAN dominant. A dominant state overwrites the recessive state.

During arbitration, multiple CAN nodes may transmit a dominant bit at the same time. In this case the differential voltage of the bus will be greater than the differential voltage of a single driver.

The host microprocessor of the CAN node will use the TXD terminal to drive the bus and will receive data from the bus on the RXD pin.

Transceivers with low power Standby Mode have a third bus state where the bus terminals are weakly biased to ground via the high resistance internal resistors of the receiver. See Figure 31 and Figure 32.

TCAN330 TCAN332 TCAN334 TCAN337 TCAN330G TCAN332G TCAN334G TCAN337G Bus_States_sllseq7.gifFigure 31. Bus States (Physical Bit Representation)
TCAN330 TCAN332 TCAN334 TCAN337 TCAN330G TCAN332G TCAN334G TCAN337G Simplified_Recessive_CMB_sllseq7.gif
A. Normal and Silent Modes
B. Standby and Shutdown Modes
Figure 32. Simplified Recessive Common Mode Bias Unit and Receiver

The devices have four main operating modes:

  1. Normal mode (all devices)
  2. Silent mode (TCAN330, TCAN337)
  3. Standby mode with wake (TCAN334)
  4. Shutdown mode (TCAN330, TCAN334)

Table 3. CAN Transceivers with Silent Mode

S Device MODE DRIVER RECEIVER RXD PIN
HIGH Reduced Power Silent (Listen) Mode Disabled (OFF)(2) Enabled (ON) Mirrors Bus State(1)
LOW/NC Normal Mode Enabled (ON) Enabled (ON)
(1) Mirrors bus state: low if CAN bus is dominant, high if CAN bus is recessive.
(2) See Figure 31 for bus state.

Table 4. CAN Transceivers with Standby Mode with Wake

STB Device MODE DRIVER RECEIVER RXD Terminal
HIGH Ultra Low Current Standby Mode Disabled (OFF)(2) Low Power Receiver and Bus Monitor Enabled (ON) High (Recessive) until WUP, then filtered mirrors of Bus State (1)
LOW/NC Normal Mode Enabled (ON) Enabled (ON) Mirrors Bus State (1)
(1) Standby Mode RXD behavior: See Figure 33.

Table 5. CAN Transceivers with Shutdown Mode

SHDN Device MODE DRIVER RECEIVER RXD Terminal
HIGH Lowest Current Disabled (OFF)(2) Disabled (OFF) High (Recessive)
LOW/NC Normal Mode Enabled (ON) Enabled (ON) Mirrors Bus State (1)