SLLA651 April   2025 TCAN2845-Q1 , TCAN2847-Q1 , TCAN2855-Q1 , TCAN2857-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Device States
    1. 2.1 Init Mode
    2. 2.2 Restart Mode
    3. 2.3 Standby Mode
    4. 2.4 Normal Mode
    5. 2.5 Sleep Mode
    6. 2.6 Fail-Safe Mode
  6. 3Power Electronics
    1. 3.1 VSUP
    2. 3.2 VHSS
    3. 3.3 VCAN
    4. 3.4 VCC1
    5. 3.5 VCC2
    6. 3.6 VEXMON, VEXCTRL, and VEXCC
    7. 3.7 HSSx
  7. 4Communication Capabilities
    1. 4.1 CAN-FD and Classical CAN
    2. 4.2 CAN-SIC
    3. 4.3 LIN
  8. 5Protection Features
    1. 5.1 Undervoltage (UV) Monitors
      1. 5.1.1 VSUP
      2. 5.1.2 VHSS
      3. 5.1.3 VCAN
      4. 5.1.4 VEXCC
      5. 5.1.5 VCC1
      6. 5.1.6 VCC2
    2. 5.2 Overvoltage (OV) Monitors
      1. 5.2.1 HSSx
      2. 5.2.2 VCC1
      3. 5.2.3 VCC2
      4. 5.2.4 VEXCC
    3. 5.3 Short Circuit (SC) Monitors
      1. 5.3.1 VCC1
      2. 5.3.2 VCC2
      3. 5.3.3 VEXCC
    4. 5.4 Electrical Faults and Impact on SBC Mode
    5. 5.5 Temperature Sensors
    6. 5.6 Watchdog
      1. 5.6.1 Watchdog Error Counter
      2. 5.6.2 Timeout
      3. 5.6.3 Window
      4. 5.6.4 Initial Long Window
      5. 5.6.5 Q&A
    7. 5.7 Communication Fault Monitoring
      1. 5.7.1 CAN
      2. 5.7.2 LIN
    8. 5.8 LIMP
  9. 6Programming, Memory, and Control
    1. 6.1 SPI
    2. 6.2 EEPROM
    3. 6.3 Interrupts
    4. 6.4 Control
  10. 7Miscellaneous Features
    1. 7.1 Local Wake Ups
    2. 7.2 CAN Bus Wake Up (BWRR)
    3. 7.3 Partial Networking
    4. 7.4 GFO, nRST, and SW
  11. 8Summary
  12. 9References

5 Protection Features

With strong feature support in terms of communication and power – the TCAN28XX family of devices also integrates extensive protection features to create a robust SBC. The protection features are multi-faceted that combine voltage monitoring, temperature monitoring, controller to SBC communication monitoring (through a watchdog timer), communication bus fault monitoring, LIMP home indicator, and a separate fail-safe mode available to SBC. The following subsections can take a dive into where the protection features are with a high-level guide to how they operate. Table 5-1 highlights important protection feature specifications.

Table 5-1 Key Supply Characteristics w.r.t. Fault Thresholds
Pin Spec ID Spec. Description Min Value Typ. Value Max Value
ELECTRICAL SPECIFICATIONS
VSUP VSUP(PU)R Supply On Detection 3.1V 3.4V 3.7V
VSUP VSUP(PU)F Supply Off Detection 2.7V 3V 3.3V
VSUP UVSUP5R 5V Supply UV Recovery 4.9V - 5.5V
VSUP UVSUP5F 5V Supply UV Detection 4.5V - 5.1V
VSUP UVSUP33R 3.3V Supply UV Recovery 3.7V - 4.4V
VSUP UVSUP33F 3.3V Supply UV Detection 3.55V - 4.25V
VHSS UVHSSR VHSS UV recovery 4.6V - 4.9V
VHSS UVHSSF VHSS UV Detection 4.4V - 4.7V
VHSS OVHSSR VHSS OV Detection 20V - 22V
VHSS OVHSSF VHSS OV Recovery 18.8V - 21.2V
VCAN UVCANR VCAN UV Recovery - 4.2V 4.5V
VCAN UVCANF VCAN UV Detection 3.5V 4V -
VEXCC UVEXCCR VEXCC UV Recovery 0.87 * VEXCC 0.9 * VEXCC 0.93 * VEXCC
VEXCC UVEXCCF VEXCC UV Detection 0.81 * VEXCC 0.85 * VEXCC 0.89 * VEXCC
VEXCC OVEXCCR VEXCC OV Detection 1.12 * VEXCC 1.15 * VEXCC 1.18 * VEXCC
VEXCC

OVEXCCF

 VEXCC OV Recovery 1.07 * VEXCC 1.1 * VEXCC 1.13 * VEXCC
VEXCC VEXCCSC18 VEXCC Short detection for 1.8V and 2.5V outputs - 1.1V 1.26V
VEXCC VEXCCSC VEXCC Short Detection for 3.3V and 5V outputs 1.7V - 2.3V
VCC1 (5V) UVCC1R1 VCC1 UV Recovery 1 4.6V - 4.85V
VCC1 (5V) UVCC1F4 VCC1 UV Detection 1 4.5V - 4.75V

VCC1 (5V)

UVCC1R2

VCC1 UV Recovery 2

3.85V

-

4.15V

VCC1 (5V)

UVCC1F4

VCC1 UV Detection 2

3.75V

-

4.05V

VCC1 (5V)

UVCC1R3

VCC1 UV Recovery 3

3.25V

-

3.55V

VCC1 (5V)

UVCC1F4

VCC1 UV Detection 3

3.15V

-

3.45V

VCC1 (5V)

UVCC1R4

VCC1 UV Recovery 4

2.5V

-

2.9V

VCC1 (5V)

UVCC1F4

VCC1 UV Detection 4

2.4V

-

2.8V

VCC1 (5V)

OVCC1R1

VCC1 OV Detection 1

5.25V

-

5.5V

VCC1 (5V)

OVCC1F1

VCC1 OV Recovery 1

5.15V

-

5.4V

VCC1 (5V)

OVCC1R2

VCC1 OV Detection 2

5.5V

-

5.7V

VCC1 (5V)

OVCC1F2

VCC1 OV Recovery 2

5.7V

-

5.6V

VCC1 (5V)

VCC15SC

VCC1 Short Circuit Detection Threshold

1.7V

-

2.3V

VCC1 (5V)

UVCC15RPR

VCC1 UV Prewarning Recovery (VCC1 = 5V)

4.65V

-

4.9V

VCC1 (5V)

UVCC15FPR

VCC1 UV Prewarning Detection (VCC1 = 5V)

4.55V

-

4.8V

VCC1 (3.3V)

UVCC1R1

VCC1 UV Recovery 1

3V

-

3.2V

VCC1 (3.3V)

UVCC1F4

VCC1 UV Detection 1

2.95V

-

3.15V

VCC1 (3.3V)

UVCC1R2

VCC1 UV Recovery 2

2.55V

-

2.75V

VCC1 (3.3V)

UVCC1F4

VCC1 UV Detection 2

2.5V

-

2.7V

VCC1 (3.3V)

UVCC1R3

VCC1 UV Recovery 3

2.25V

-

2.45V

VCC1 (3.3V)

UVCC1F4

VCC1 UV Detection 3

2.2V

-

2.4V

VCC1 (3.3V)

UVCC1R4

VCC1 UV Recovery 4

2.05V

-

2.25V

VCC1 (3.3V)

UVCC1F4

VCC1 UV Detection 4

2V

-

2.2V

VCC1 (3.3V)

OVCC1R1

VCC1 OV Detection 1

3.45V

-

3.6V

VCC1 (3.3V)

OVCC1F1

VCC1 OV Recovery 1

3.4V

-

3.55V

VCC1 (3.3V)

OVCC1R2

VCC1 OV Detection 2

3.6V

-

3.8V

VCC1 (3.3V)

OVCC1F2

VCC1 OV Recovery 2

3.5V

-

3.7V

VCC1 (3.3V)

VCC133SC

VCC1 Short Circuit Detection Threshold

-

1.22V

1.26V

VCC1 (3.3V)

UVCC133RPR

VCC1 UV Prewarning Recovery (VCC1 = 3.3V)

3.1V

-

3.28V

VCC1 (3.3V)

UVCC133FPR

VCC1 UV Prewarning Detection (VCC1 = 3.3V)

3V

-

3.2V

VCC2

UVCC2R

VCC2 UV Recovery

4.6V

-

4.9V

VCC2

UVCC2F

VCC2 UV Detection

4.5V

-

4.75V

VCC2

OVCC2R

VCC2 OV Detection

5.4V

-

5.6V

VCC2

OVCC2F

VCC2 OV Recovery

5.2V

-

5.5V

VCC2

VCC2SC

VCC2 Short Circuit Detection Threshold

1.7V

-

2.3V

TIMING SPECIFICATIONS

LDO Outputs

tUVFLTR

UV detection delay

25us

-

50us

VCC1

tUVCC1PR

UV Prewarning Detection Delay

2us

-

12us

VCAN

tUVCANFLTR

UV Detection Delay on VCAN

2us

-

10us

LDO Outputs

tOVFLTR

OV Detection Delay

20us

-

45us

VHSS

tOVFLTRVHSS

OV Detection Delay VHSS

4us

-

12us

LDO Outputs

tVSC

SC Detection Delay

75us

100us

125us

VCC1+VEXCC

tVSCLS

SC Detection Delay when VEXCC and VCC1 are load sharing

75us

100us

125us

LDO Outputs

tLDOON

LDO On time during FSM to check if fault has cleared

-

-

3.8ms

VCC1

tLDOOFF

LDO Off time in fail-safe mode before wake events are accepted

250ms

300ms

350ms