SLLS632C December   2005  – February 2015 SN65HVD1050

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (Continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Driver Electrical Characteristics
    6. 7.6  Receiver Electrical Characteristics
    7. 7.7  Device Switching Characteristics
    8. 7.8  Driver Switching Characteristics
    9. 7.9  Receiver Switching Characteristics
    10. 7.10 Supply Current
    11. 7.11 S-Pin Characteristics
    12. 7.12 VREF-Pin Characteristics
    13. 7.13 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Mode Control
        1. 9.3.1.1 Normal Mode
        2. 9.3.1.2 Silent Mode
      2. 9.3.2 TXD Dominant Timeout (DTO)
      3. 9.3.3 Thermal Shutdown
      4. 9.3.4 VREF
      5. 9.3.5 Operating Temperature Range
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
        1. 10.2.1.1 Bus Loading, Length, and Number of Nodes
        2. 10.2.1.2 CAN Termination
          1. 10.2.1.2.1 Loop Propagation Delay
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 ESD Protection
        2. 10.2.2.2 Transient Voltage Suppresser (TVS) Diodes
      3. 10.2.3 Application Curve
    3. 10.3 System Example
      1. 10.3.1 ISO 11898 Compliance of SN65HVD1050 5-V CAN Transceiver
        1. 10.3.1.1 Introduction
        2. 10.3.1.2 Differential Signal
        3. 10.3.1.3 Common-Mode Signal
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Trademarks
    2. 13.2 Electrostatic Discharge Caution
    3. 13.3 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

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9 Detailed Description

9.1 Overview

The SN65HVD1050 CAN tranceivers is compatible with the ISO1189-2 High Speed CAN (Controller Area Network) physical layer standard. It is designed to interface between the differential bus lines in controller area network and the CAN protocol controller at data rates up to 1 Mbps.

9.2 Functional Block Diagram

SN65HVD1050 BlockDiagramwoPackage.gif

9.3 Feature Description

9.3.1 Mode Control

9.3.1.1 Normal Mode

Select the normal mode of the device operation by setting the S pin low. The CAN bus driver and receiver are fully operational and the CAN communication is bidirectional. The driver is translating a digital input on TXD to a differential output on CANH and CANL. The receiver is translating the differential signal from CANH and CANL to a digital output on RXD.

9.3.1.2 Silent Mode

Activate silent mode (receive only) by setting the S pin high. The CAN driver is turned off while the receiver remains active and RXD outputs the received bus data.

NOTE

Silent mode may be used to implement babling idiot protection, to ensure that the driver does not disrupt the network during a local fault. Silent mode may also be used in redundant systems to select or deselect the redundant transceiver (driver) when needed.

9.3.2 TXD Dominant Timeout (DTO)

During normal mode, the mode where the CAN driver is active, the TXD DTO circuit prevents the transceiver from blocking network communication in the event of a hardware or software failure where TXD is held dominant longer than the timeout period tTXD_DTO. The DTO circuit is triggered on a falling edge on the driver input, TXD. The DTO circuit disables the CAN bus driver if no rising edge is seen on TXD before the timeout period expires. This frees the CAN bus for communication between other nodes on the network. The CAN driver is re-enabled when a rising edge is seen on the drvier input, TXD, thus clearing the TXD DTO condition. The receiver and RXD pin still reflect the CAN bus, and the bus pins are biased to recessive level during a TXD DTO.

NOTE

The minimum dominant TXD time allowed by the TXD DTO circuit limits the minimum possible transmitted data rate on the device. The CAN protocol allows a maximum of eleven successive dominant bits (on TXD) for the worst case, where five successive dominant bits are followed immediately by an error frame. This, along with the tTXD_DTO minimum, limits the minimum data rate. Calculate the minimum transmitted data rate using: Minimum Data Rate = 11 / tTXD_DTO

9.3.3 Thermal Shutdown

The SN65HVD1050 has a thermal shutdown feature that turns off the driver outputs when the junction temperature nears 190°C. This shutdown prevents catastrophic failure from bus shorts, but does not protect the circuit from possible damage. The user should strive to maintain recommended operating conditions and not exceed absolute-maximum ratings at all times. If an SN65HVD1050 is subjected to many, or long-duration faults that can put the device into thermal shutdown, it should be replaced.

9.3.4 VREF

A reference voltage of VCC/2 is available through the VREF output pin. The VREF voltage should be tied to the common mode point in a split termination network to help stabilize the output common mode voltage. See Figure 27 for more application specific information on properly terminating the CAN bus.

If the VREF output pin is not used it can be left floating.

9.3.5 Operating Temperature Range

The SN65HVD1050 is characterized for operation from –40°C to 125°C.

9.4 Device Functional Modes

Table 2. Driver

INPUTS OUTPUTS BUS STATE
TXD(1) S(1) CANH(1) CANL(1)
L L or Open H L DOMINANT
H X Z Z RECESSIVE
Open X Z Z RECESSIVE
X H Z Z RECESSIVE

Table 3. Receiver

DIFFERENTIAL INPUTS
VID = V(CANH) – V(CANL)		 OUTPUT RXD(1) BUS STATE
VID ≥ 0.9V L DOMINANT
0.5V < VID < 0.9V ? ?
VID ≤ 0.5V H RECESSIVE
Open H RECESSIVE
(1) H = high level; L = low level; X = irrelevant; ? = indeterminate; Z = high impedance

Table 4. Parametric Cross Reference With the TJA1050

TJA1050(1) PARAMETER HVD1050
TRANSMITTER SECTION
VIH High-level input voltage Recommended VIH
VIL Low-level input voltage Recommended VIL
IIH High-level input current Driver IIH
IIL Low-level input current Driver IIL
BUS SECTION
ILI Power-off bus input current Receiver II(off)
IO(SC) Short-circuit output current Driver IOS(SS)
VO(dom) Dominant output voltage Driver VO(D)
Vi(dif)(th) Differential input voltage Receiver VIT and recommended VID
Vi(dif)(hys) Diffrential input hysteresis Receiver Vhys
VO(reces) Recessive output voltage Driver VO(R)
VO(dif)(bus) Differential bus voltage Driver VOD(D) and VOD(R)
Ri(cm) CANH, CANL input resistance Receiver RIN
Ri(dif) Differential input resistance Receiver RID
Ri(cm)(m) Input resistance matching Receiver RI (m)
Ci Input capacitance to ground Receiver CI
Ci(dif) Differential input capacitance Receiver CID
RECEIVER SECTION
IOH High-level output current Recommended IOH
IOL Low-level output current Recommended IOL
Vref PIN SECTION
Vref Reference output voltage VO
TIMING SECTION
td(TXD-BUSon) Delay TXD to bus active Driver tPLH
td(TXD-BUSoff) Delay TXD to bus inactive Driver tPHL
td(BUSon-RXD) Delay bus active to RXD Receiver tPHL
td(BUSoff-RXD) Delay bus inactive to RXD Receiver tPLH
td(TXD-BUSon) + td(BUSon-RXD) Device tLOOP1
td(TXD-BUSoff) + td(BUSoff-RXD) Device tLOOP2
tdom(TXD) Dominant time out Driver t(dom)
S PIN SECTION
VIH High-level input voltage Recommended VIH
VIL Low-level input voltage Recommended VIL
IIH High-level input current IIH
IIL Low-level input current IIL
(1) From TJA1050 Product Specification, Philips Semiconductors, 2002 May 16.
SN65HVD1050 io_sch_lls632.gifFigure 22. Equivalent Input and Output Schematic Diagrams