SLLSF09E December   2017  – January 2020 ISO1042

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Application Diagram
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions—16 Pins
    2.     Pin Functions—8 Pins
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Transient Immunity
    4. 6.4  Recommended Operating Conditions
    5. 6.5  Thermal Information
    6. 6.6  Power Ratings
    7. 6.7  Insulation Specifications
    8. 6.8  Safety-Related Certifications
    9. 6.9  Safety Limiting Values
    10. 6.10 Electrical Characteristics - DC Specification
    11. 6.11 Switching Characteristics
    12. 6.12 Insulation Characteristics Curves
    13. 6.13 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Test Circuits
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 CAN Bus States
      2. 8.3.2 Digital Inputs and Outputs: TXD (Input) and RXD (Output)
      3. 8.3.3 Protection Features
        1. 8.3.3.1 TXD Dominant Timeout (DTO)
        2. 8.3.3.2 Thermal Shutdown (TSD)
        3. 8.3.3.3 Undervoltage Lockout and Default State
        4. 8.3.3.4 Floating Pins
        5. 8.3.3.5 Unpowered Device
        6. 8.3.3.6 CAN Bus Short Circuit Current Limiting
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Bus Loading, Length and Number of Nodes
        2. 9.2.2.2 CAN Termination
      3. 9.2.3 Application Curve
    3. 9.3 DeviceNet Application
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 PCB Material
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resource
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

8.4 Device Functional Modes

Table 3 and Table 4 list the driver and receiver functions. Table 5 lists the functional modes for the ISO1042 device.

Table 3. Driver Function Table

INPUT OUTPUTS DRIVEN BUS STATE
TXD(1) CANH(1) CANL(1)
L H L Dominant
H Z Z Recessive
(1) H = high level, L = low level, Z = common mode (recessive) bias to VCC / 2. See Figure 25 and Figure 26 for bus state and common mode bias information.

Table 4. Receiver Function Table

DEVICE MODE CAN DIFFERENTIAL INPUTS
VID = VCANH – VCANL(3) 		BUS STATE RXD PIN(1)
Normal VID ≥ VIT(MAX) Dominant L
VIT(MIN) < VID < VIT(MAX) ? ?
VID ≤ VIT(MIN) Recessive H
Open (VID ≈ 0 V) Open H
(1) H = high level, L = low level, ? = indeterminate.

Table 5. Function Table(1)

DRIVER RECEIVER
INPUTS OUTPUTS BUS STATE DIFFERENTIAL INPUTS VID = CANH–CANL(3) OUTPUT
RXD		 BUS STATE
TXD CANH CANL
L(2) H L DOMINANT VID ≥ VIT(MAX) L DOMINANT
H Z Z RECESSIVE VIT(MIN) < VID < VIT(MAX) ? ?
Open Z Z RECESSIVE VID ≤ VIT(MIN) H RECESSIVE
X Z Z RECESSIVE Open (VID ≈ 0 V) H RECESSIVE
(1) H = high level; L = low level; X = irrelevant; ? = indeterminate; Z = high impedance
(2) Logic low pulses to prevent dominant time-out.
(3) See Receiver Electrical Characteristics section for input thresholds.