SLLSF80B October   2019  – March 2022 TCAN1144-Q1 , TCAN1145-Q1 , TCAN1146-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description continued
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1  Absolute Maximum Ratings
    2. 8.2  ESD Ratings
    3. 8.3  ESD Ratings
    4. 8.4  Recommended Operating Conditions
    5. 8.5  Thermal Information
    6. 8.6  Supply Characteristics
    7. 8.7  Electrical Characteristics
    8. 8.8  Timing Requirements
    9. 8.9  Switching Characteristics
    10. 8.10 Typical Characteristics
  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  VSUP Pin
      2. 10.3.2  VIO Pin
      3. 10.3.3  VCC Pin
      4. 10.3.4  GND
      5. 10.3.5  INH/LIMP Pin
      6. 10.3.6  WAKE Pin
      7. 10.3.7  TXD Pin
      8. 10.3.8  RXD Pin
      9. 10.3.9  SDO/nINT Interrupt Pin
      10. 10.3.10 nCS Pin
      11. 10.3.11 SCLK
      12. 10.3.12 SDI
      13. 10.3.13 CANH and CANL Bus Pins
    4. 10.4 Device Functional Modes
      1. 10.4.1 Normal Mode
      2. 10.4.2 Standby Mode
      3. 10.4.3 Listen Only Mode
      4. 10.4.4 Sleep Mode
        1. 10.4.4.1 Bus Wake via RXD Request (BWRR) in Sleep Mode
        2. 10.4.4.2 Local Wake Up (LWU) via WAKE Input Terminal
      5. 10.4.5 Selective Wake-up
        1. 10.4.5.1 Selective Wake Mode (TCAN1145-Q1 and TCAN1146-Q1)
        2. 10.4.5.2 Frame Detection (TCAN1145-Q1 and TCAN1146-Q1)
        3. 10.4.5.3 Wake-Up Frame (WUF) Validation (TCAN1145-Q1 and TCAN1146-Q1)
        4. 10.4.5.4 WUF ID Validation (TCAN1145-Q1 and TCAN1146-Q1)
        5. 10.4.5.5 WUF DLC Validation (TCAN1145-Q1 and TCAN1146-Q1)
        6. 10.4.5.6 WUF Data Validation (TCAN1145-Q1 and TCAN1146-Q1)
        7. 10.4.5.7 Frame error counter (TCAN1145-Q1 and TCAN1146-Q1)
        8. 10.4.5.8 CAN FD Frame Tolerance (TCAN1145-Q1 and TCAN1146-Q1)
      6. 10.4.6 Fail-safe Features
        1. 10.4.6.1 Sleep Mode via Sleep Wake Error
        2. 10.4.6.2 Fail-safe Mode
      7. 10.4.7 Protection Features
        1. 10.4.7.1 Driver and Receiver Function
        2. 10.4.7.2 Floating Terminals
        3. 10.4.7.3 TXD Dominant Time Out (DTO)
        4. 10.4.7.4 CAN Bus Short Circuit Current Limiting
        5. 10.4.7.5 Thermal Shutdown
        6. 10.4.7.6 Under-Voltage Lockout (UVLO) and Unpowered Device
          1. 10.4.7.6.1 UVSUP, UVCC
          2. 10.4.7.6.2 UVIO
            1. 10.4.7.6.2.1 Fault Behavior
        7. 10.4.7.7 Watchdog (TCAN1144-Q1 and TCAN1146-Q1)
          1. 10.4.7.7.1 Watchdog Error Counter
          2. 10.4.7.7.2 Watchdog SPI Control Programming
          3. 10.4.7.7.3 Watchdog Timing
          4. 10.4.7.7.4 Question and Answer Watchdog
            1. 10.4.7.7.4.1 WD Question and Answer Basic information
            2. 10.4.7.7.4.2 Question and Answer Register and Settings
            3. 10.4.7.7.4.3 WD Question and Answer Value Generation
          5. 10.4.7.7.5 Question and Answer WD Example
            1. 10.4.7.7.5.1 Example configuration for desired behavior
            2. 10.4.7.7.5.2 Example of performing a question and answer sequence
      8. 10.4.8 Bus Fault Detection and Communication (TCAN1144-Q1 and TCAN1146-Q1)
      9. 10.4.9 SPI Communication
        1. 10.4.9.1 Chip Select Not (nCS):
        2. 10.4.9.2 SPI Clock Input (SCLK):
        3. 10.4.9.3 SPI Serial Data Input (SDI):
        4. 10.4.9.4 SPI Serial Data Output (SDO):
    5. 10.5 Programming
    6. 10.6 Register Maps
      1. 10.6.1  DEVICE_ID_y Register (Address = 0h + formula) [reset = value]
      2. 10.6.2  REV_ID_MAJOR Register (Address = 8h) [reset = 01h]
      3. 10.6.3  REV_ID_MINOR Register (Address = 9h) [reset = 00h]
      4. 10.6.4  SPI_RSVD_x Register (Address = Ah + formula) [reset = 00h]
      5. 10.6.5  Scratch_Pad_SPI Register (Address = Fh) [reset = 00h]
      6. 10.6.6  MODE_CNTRL Register (Address = 10h) [reset = 04h]
      7. 10.6.7  WAKE_PIN_CONFIG Register (Address = 11h) [reset = 4h]
      8. 10.6.8  PIN_CONFIG Register (Address = 12h) [reset = 00h]
      9. 10.6.9  WD_CONFIG_1 Register (Address = 13h) [reset = 15h]
      10. 10.6.10 WD_CONFIG_2 Register (Address = 14h) [reset = 02h]
      11. 10.6.11 WD_INPUT_TRIG Register (Address = 15h) [reset = 00h]
      12. 10.6.12 WD_RST_PULSE Register (Address = 16h) [reset = 07h]
      13. 10.6.13 FSM_CONFIG Register (Address = 17h) [reset = 00h]
      14. 10.6.14 FSM_CNTR Register (Address = 18h) [reset = 00h]
      15. 10.6.15 DEVICE_RST Register (Address = 19h) [reset = 00h]
      16. 10.6.16 DEVICE_CONFIG1 Register (Address = 1Ah) [reset = 00h]
      17. 10.6.17 DEVICE_CONFIG2 Register (Address = 1Bh) [reset = 0h]
      18. 10.6.18 SWE_DIS Register (Address 1Ch) [reset = 04h]
      19. 10.6.19 SDO_CONFIG Register (Address = 29h) [reset = 00h]
      20. 10.6.20 WD_QA_CONFIG Register (Address = 2Dh) [reset = 00h]
      21. 10.6.21 WD_QA_ANSWER Register (Address = 2Eh) [reset = 00h]
      22. 10.6.22 WD_QA_QUESTION Register (Address = 2Fh) [reset = 00h]
      23. 10.6.23 SW_ID1 Register (Address = 30h) [reset = 00h]
      24. 10.6.24 SW_ID2 Register (Address = 31h) [reset = 00h]
      25. 10.6.25 SW_ID3 Register (Address = 32h) [reset = 00h]
      26. 10.6.26 SW_ID4 Register (Address = 33h) [reset = 00h]
      27. 10.6.27 SW_ID_MASK1 Register (Address = 34h) [reset = 00h]
      28. 10.6.28 SW_ID_MASK2 Register (Address = 35h) [reset = 00h]
      29. 10.6.29 SW_ID_MASK3 Register (Address = 36h) [reset = 00h]
      30. 10.6.30 SW_ID_MASK4 Register (Address = 37h) [reset = 00h]
      31. 10.6.31 SW_ID_MASK_DLC Register (Address = 38h) [reset = 00h]
      32. 10.6.32 DATA_y Register (Address = 39h + formula) [reset = 00h]
      33. 10.6.33 SW_RSVD_y Register (Address = 41h + formula) [reset = 00h]
      34. 10.6.34 SW_CONFIG_1 Register (Address = 44h) [reset = 50h]
      35. 10.6.35 SW_CONFIG_2 Register (Address = 45h) [reset = 00h]
      36. 10.6.36 SW_CONFIG_3 Register (Address = 46h) [reset = 1Fh]
      37. 10.6.37 SW_CONFIG_4 Register (Address = 47h) [reset = 00h]
      38. 10.6.38 SW_CONFIG_RSVD_y Register (Address = 48h + formula) [reset = 00h]
      39. 10.6.39 INT_GLOBAL Register (Address = 50h) [reset = 00h]
      40. 10.6.40 INT_1 Register (Address = 51h) [reset = 00h]
      41. 10.6.41 INT_2 Register (Address = 52h) [reset = 40h]
      42. 10.6.42 INT_3 Register (Address 53h) [reset = 00h]
      43. 10.6.43 INT_CANBUS Register (Address = 54h) [reset = 00h]
      44. 10.6.44 INT_GLOBAL_ENABLE (Address = 55h) [reset = 00h]
      45. 10.6.45 INT_ENABLE_1 Register (Address = 56h) [reset = FFh]
      46. 10.6.46 INT_ENABLE_2 Register (Address = 57h) [reset = 1Fh]
      47. 10.6.47 INT_ENABLE_3 Register (Address = 58h) [reset = 0h]
      48. 10.6.48 INT_ENABLE_CANBUS Register (Address = 59h) [reset = 7Fh]
      49. 10.6.49 INT_RSVD_y Register (Address = 5Ah + formula) [reset = 00h]
  11. 11Application Information Disclaimer
    1. 11.1 Application Information
      1. 11.1.1 BUS Loading, Length and Number of Nodes
      2. 11.1.2 CAN Termination
        1. 11.1.2.1 Termination
        2. 11.1.2.2 CAN Bus Biasing
    2. 11.2 Typical Application
      1. 11.2.1 Design Requirements
      2. 11.2.2 Detailed Design Procedure
        1. 11.2.2.1 Brownout
      3. 11.2.3 Application Curves
  12. 12Power Supply Recommendations
  13. 13Layout
    1. 13.1 Layout Guidelines
    2. 13.2 Layout Example
  14. 14Device and Documentation Support
    1. 14.1 Documentation Support
      1. 14.1.1 CAN Transceiver Physical Layer Standards:
      2. 14.1.2 EMC Requirements:
      3. 14.1.3 Conformance Test Requirements:
      4. 14.1.4 Related Documentation
    2. 14.2 Receiving Notification of Documentation Updates
    3. 14.3 Support Resources
    4. 14.4 Trademarks
    5. 14.5 Electrostatic Discharge Caution
    6. 14.6 Glossary
  15. 15Mechanical, Packaging, and Orderable Information
10.4.7.7.4.3 WD Question and Answer Value Generation

The 4-bit WD question, WD_QA_QUESTION[3:0], is generated by 4-bit Markov chain process. A Markov chain is a stochastic process with Markov property, which means that state changes are probabilistic, and the future state depends only on the current state. The valid and complete WD answer sequence for each WD Q&A mode is as follows:

  • For WD Q&A multi-answer:
    1. Three correct SPI WD answers are received during RESPONSE WINDOW 1.
    2. One correct SPI WD answer is received during RESPONSE WINDOW 2.
    3. In addition to the previously listed timing, the sequence of four responses shall be correct.

The WD question value is latched in the WD_QUESTION[3:0] bits of the WD_QA_QUESTION register and can be read out at any time.

The Markov chain process is clocked by the 4-bit Question counter at the transition from b1111 to b0000. This includes the condition of a correct answer (correct answer value and correct timing response). The logic combination of the 4-bit questions WD_QUESTION [3:0] generation is given in Figure 10-27.

GUID-20201021-CA0I-FMJZ-ZPSJ-HSGD4HG6MQDG-low.gif
If the current y value is 0000, the next y value is 0001. The next watchdog question generation process starts from that value.
Figure 10-27 Watchdog Question Generation

Table 10-12 contains the answers for each question, as long as the question polynomial and answer generation configuration are both at their default values.

Table 10-12 Example answers to questions with default settings
QUESTION IN WD_QUESTION_VALUE REGISTERWD ANSWER BYTES (EACH BYTE TO BE WRITTEN INTO WD_QA_ANSWER REGISTER)
WD_ANSWER_RESP_3WD_ANSWER_RESP_2WD_ANSWER_RESP_1WD_ANSWER_RESP_0
WD_QUESTIONWD_ANSW_CNT 2'b11WD_ANSW_CNT 2'b10WD_ANSW_CNT 2'b01WD_ANSW_CNT 2'b00
0x0FF0FF000
0x1B040BF4F
0x2E919E616
0x3A656A959
0x475857A8A
0x53ACA35C5
0x663936C9C
0x72CDC23D3
0x8D222DD2D
0x99D6D9262
0xAC434CB3B
0xB8B7B8474
0xC58A857A7
0xD17E718E8
0xE4EBE41B1
0xF01F10EFE
GUID-20201021-CA0I-SP8F-MCQD-GG48RJFQTLV2-low.gifFigure 10-28 WD Expected Answer Generation
Table 10-13 Correct and Incorrect WD Q&A Sequence Run Scenarios for WD Q&A Multi-Answer Mode (WD_CFG = 0b)
NUMBER OF WD ANSWERSACTIONWD STATUS BITS IN WD_QA_QUESTION REGISTERCOMMENTS
RESPONSE
WINDOW 1		RESPONSE
WINDOW 2		QA_ANSW_ERRWD_ERR(1)
0 answer0 answer-New WD cycle starts after the end of RESPONSE WINDOW 2
-Increment WD failure counter
-New WD cycle starts with the same WD question		0b1bNo answers
0 answer4 INCORRECT answer-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1bTotal WD_ANSW_CNT[1:0] = 4
0 answer4 CORRECT answer-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		0b1bTotal WD_ANSW_CNT[1:0] = 4
0 answer1 CORRECT answer-New WD cycle starts after the end of RESPONSE WINDOW 2
-Increment WD failure counter
-New WD cycle starts with the same WD question		0b1bLess than 3 CORRECT ANSWER in RESPONSE WINDOW 1 and 1 CORRECT ANSWER in RESPONSE WINDOW 2 (Total WD_ANSW_CNT[1:0] < 4)
1 CORRECT answer1 CORRECT answer
2 CORRECT answer1 CORRECT answer
0 answer1 INCORRECT answer-New WD cycle starts after the end of RESPONSE WINDOW 2
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1bLess than 3 CORRECT ANSWER in RESPONSE WINDOW 1 and 1 INCORRECT ANSWER in RESPONSE WINDOW 2 (Total WD_ANSW_CNT[1:0] < 4)
1 CORRECT answer1 INCORRECT answer
2 CORRECT answer1 INCORRECT answer
0 answer4 CORRECT answer-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		0b1bLess than 3 CORRECT ANSWER in WIN1 and more than 1 CORRECT ANSWER in RESPONSE WINDOW 2 (Total WD_ANSW_CNT[1:0] = 4)
1 CORRECT answer3 CORRECT answer
2 CORRECT answer2 CORRECT answer
0 answer4 INCORRECT answer-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1bLess than 3 CORRECT ANSWER in RESPONSE WINDOW 1 and more than 1 INCORRECT ANSWER in RESPONSE WINDOW 2 (Total WD_ANSW_CNT[1:0] = 4)
1 CORRECT answer3 INCORRECT answer
2 CORRECT answer2 INCORRECT answer
0 answer3 CORRECT answer-New WD cycle starts after the end of RESPONSE WINDOW 2
-Increment WD failure counter
-New WD cycle starts with the same WD question		0b1bLess than 3 INCORRECT ANSWER in RESPONSE WINDOW 1 and more than 1 CORRECT ANSWER in RESPONSE WINDOW 2 (Total WD_ANSW_CNT[1:0] < 4)
1 INCORRECT answer2 CORRECT answer-New WD cycle starts after the end of RESPONSE WINDOW 2
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1b
2 INCORRECT answer1 CORRECT answer
0 answer3 INCORRECT answer-New WD cycle starts after the end of RESPONSE WINDOW 2
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1bLess than 3 INCORRECT ANSWER in RESPONSE WINDOW 1 and more than 1 INCORRECT ANSWER in RESPONSE WINDOW 2 (Total WD_ANSW_CNT[1:0] < 4)
1 INCORRECT answer2 INCORRECT answer
2 INCORRECT answer1 INCORRECT answer
0 answer4 CORRECT answer-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		0b1bLess than 3 INCORRECT ANSWER in RESPONSE WINDOW 1 and more than 1 CORRECT ANSWER in RESPONSE WINDOW 2 (Total WD_ANSW_CNT[1:0] = 4)
1 INCORRECT answer3 CORRECT answer1b1b
2 INCORRECT answer2 CORRECT answer
0 answer4 INCORRECT answer-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1bLess than 3 INCORRECT ANSWER in RESPONSE WINDOW 1 and more than 1 INCORRECT ANSWER in RESPONSE WINDOW 2 (Total WD_ANSW_CNT[1:0] = 4)
1 INCORRECT answer3 INCORRECT answer
2 INCORRECT answer2 INCORRECT answer
3 CORRECT answer0 answer-New WD cycle starts after the end of RESPONSE WINDOW 2
-Increment WD failure counter
-New WD cycle starts with the same WD Question		0b1bLess than 4 CORRECT ANSW in RESPONSE WINDOW 1 and more than 0 ANSWER in RESPONSE WINDOW 2 (Total WD_ANSW_CNT[1:0] < 4)
2 CORRECT answer0 answer0b1b
1 CORRECT answer0 answer
3 CORRECT answer1 CORRECT answer-New WD cycle starts after the 4th WD answer
-Decrement WD failure counter
-New WD cycle starts with a new WD question		0b0bCORRECT SEQUENCE
3 CORRECT answer1 INCORRECT answer-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1bTotal WD_ANSW_CNT[1:0] = 4
3 INCORRECT answer0 answer-New WD cycle starts after the end of RESPONSE WINDOW 2
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1bTotal WD_ANSW_CNT[1:0] < 4
3 INCORRECT answer1 CORRECT answer-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1bTotal WD_ANSW_CNT[1:0] = 4
3 INCORRECT answer1 INCORRECT answer-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1bTotal WD_ANSW_CNT[1:0] = 4
4 CORRECT answerNot applicable-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		0b1b
3 CORRECT answer + 1 INCORRECT answerNot applicable-New WD cycle starts after the 4th WD answer
-Increment WD failure counter
-New WD cycle starts with the same WD question		1b1b4 CORRECT or INCORRECT ANSWER in RESPONSE WINDOW 1
2 CORRECT answer + 2 INCORRECT answerNot applicable
1 CORRECT answer + 3 INCORRECT answerNot applicable
(1) WD_ERR is the logical OR of all WD errors.