SFFS177 October   2021 TCAN1046A-Q1 , TCAN1046AV-Q1

 

  1.   Trademarks
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
  4. 3Failure Mode Distribution (FMD)
  5. 4Pin Failure Mode Analysis (Pin FMA)
  6. 5Revision History

Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the TCAN1046A-Q1 and TCAN1046AV-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:

Table 4-2 through Table 4-8 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.

Table 4-1 TI Classification of Failure Effects
ClassFailure Effects
APotential device damage that affects functionality
BNo device damage, but loss of functionality
CNo device damage, but performance degradation
DNo device damage, no impact to functionality or performance

Figure 4-1 shows the TCAN1046A-Q1 pin diagram , and Figure 4-3 shows the TCAN1046AV-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the TCAN1046A-Q1/TCAN1046AV-Q1 data sheet.

Figure 4-1 TCAN1046A-Q1 D Package, 14 Pin SOIC, Top View
Figure 4-2 TCAN1046A-Q1 DMT Package, 14 Pin VSON, Top View
GUID-20210629-CA0I-PNPF-BG41-ZDZ7LKRZ1NXT-low.pngFigure 4-3 TCAN1046AV-Q1 D Package, 14 Pin SOIC, Top View
GUID-20210629-CA0I-79DV-LZBK-TJSBQ5PFJP05-low.pngFigure 4-4 TCAN1046AV-Q1 DMT Package, 14 Pin VSON, Top View

Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:

  • VCC = 4.5 to 5.5 V
  • VBAT = 6 to 24 V
  • VIO (if applicable) = 1.7 to 5.5 V
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No. (TCAN1046A-Q1)Pin No. (TCAN1046AV-Q1)Description of Potential Failure Effect(s)Failure Effect Class
TXD111CAN1 will enter dominant time out mode. Unable to transmit data to the CAN1 bus.B
GND122NoneD
VCC13-CAN1 unpowered, high ICC current.B
VCC-3Device unpowered, high ICC current.B
RXD144RXD default is high side FET ON, with pin short to ground, it forms direct path between supply and ground causing high currentA
TXD256CAN2 will enter dominant time out mode. Unable to transmit data to the CAN2 bus. B
GND265NoneD
VCC27-CAN2 unpowered, high ICC current.B
RXD287RXD default is high side FET ON, with pin short to ground, it forms direct path between supply and ground causing high currentA
CANL299VO(REC) spec violated. Degraded EMC performance on CAN2 bus.C
CANH21010Device cannot drive dominant to CAN2 bus, no communication possible.B
STB2118STB2 stuck low, CAN2 bus unable to enter low-power mode.B
VIO-11Device will be in protected mode. Transceiver passive on both CAN1 and CAN2 bus.B
CANL11212VO(REC) spec violated. Degraded EMC performance on CAN1 bus.C
CANH11313Device cannot drive dominant to CAN1 bus, no communication possible.B
STB11414STB1 stuck low, CAN1 bus unable to enter low-power mode.B
Thermal Pad--NoneD
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin NamePin No. (TCAN1046A-Q1)Pin No. (TCAN1046AV-Q1)Description of Potential Failure Effect(s)Failure Effect Class
TXD111TXD1 pin defaults high, CAN1 bus state always recessive and unable to transmit data to CAN1 bus.B
GND122CAN1 unpowered.B
VCC13-CAN1 unpowered.B
VCC-3Device unpowered.B
RXD144No RXD1 output, unable to receive data from CAN1 bus.B
TXD256TXD2 pin defaults high, CAN2 bus state always recessive and unable to transmit data to CAN2 bus.B
GND265CAN2 unpowered.B
VCC27-CAN2 unpowered.B
RXD287No RXD2 output, unable to receive data from CAN2 bus.B
CANL299Device cannot drive dominant on CAN2 bus, unable to communicate.B
CANH21010Device cannot drive dominant on CAN2 bus, unable to communicate.B
STB2118STB2 pin defaults high, CAN2 portion stuck in low-power mode.B
VIO-11Device will be in protected mode, Transceiver passive on both CAN1 and CAN2 bus.B
CANL11212Device cannot drive dominant on CAN1 bus, unable to communicate.B
CANH11313Device cannot drive dominant on CAN1 bus, unable to communicate.B
STB11414STB1 pin defaults high, CAN1 portion stuck in low-power mode.B
Thermal Pad--NoneD
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin TCAN1046A-Q1
Pin NamePin No.Shorted toDescription of Potential Failure Effect(s)Failure Effect Class
TXD11GND1CAN1 bus will enter dominant time out mode. Unable to transmit data to CAN1 bus.B
GND12VCC1CAN1 unpowered, high ICC current.B
VCC13RXD1RXD1 output stuck high, unable to receive data from CAN1 bus.B
RXD14TXD2RXD1 output reflects the input to TXD2, a separate CAN transceiver. Information from CAN1 will not be received correctly.B
TXD25GND2CAN2 bus will enter dominant time out mode. Unable to transmit data to CAN2 bus.B
GND26VCC2CAN2 unpowered, high ICC current.B
RXD28CANL2Messages on RXD2 will be corrupted by CANL2. Reception of data from CAN2 bus will not be possible. IOS current may be reached.B
CANL29CANH2CAN2 bus stuck recessive, no communication possible. IOS current may be reached.B
CANH210STB2CAN2 driver and receiver turn off when a dominant is driven on CAN2 bus. May not enter normal mode.B
STB211CANL1CAN2 driver and receiver may turn off when the CAN1 bus is recessive. May not enter normal mode.B
CANL112CANH1CAN1 bus stuck recessive, no communication possible IOS current may be reached.B
CANH113STB1CAN1 driver and receiver turn off when a dominant is driven on CAN1 bus. May not enter normal mode.B
Note: The VSON package includes a thermal pad. All device pins are adjacent to the thermal pad. The device behavior when pins are shorted to the thermal pad depends on which net is connected to the thermal pad.
Table 4-5 Pin FMA for Device Pins Short-Circuited to Adjacent Pin TCAN1046AV-Q1
Pin NamePin No.Shorted toDescription of Potential Failure Effect(s)Failure Effect Class
TXD11GND1CAN1 bus will enter dominant time out mode. Unable to transmit data to CAN1 bus.B
GND12VCCDevice unpowered, high ICC current.B
VCC3RXD1RXD1 output stuck high, unable to receive data from CAN1 bus.B
RXD14GND2RXD default is high side FET ON, with pin short to ground, it forms direct path between supply and ground causing high currentA
GND25TXD2CAN2 bus will enter dominant time out mode. Unable to transmit data to CAN2 bus.B
TXD26RXD2RXD2 output reflects the input to TXD2, and while this is the same transceiver, due to loop delay, the communication will be corrupted. Information from CAN2 bus will not be received correctly.B
STB28CANL2CAN2 driver and receiver may turn off when the CAN2 bus is recessive. May not enter normal mode.B
CANL29CANH2CAN2 bus stuck recessive, no communication possible. IOS current may be reached.B
CANH210VIOCAN2 bus stuck dominant, no communication possible. B
VIO11CANL1CAN1 bus stuck recessive, no communication possible. IOS current may be reached on CANL1.B
CANL112CANH1CAN1 bus stuck recessive, no communication possible IOS current may be reached.B
CANH113STB1CAN1 driver and receiver turn off when a dominant is driven. May not enter normal mode.B
Table 4-6 Pin FMA for Device Pins Short-Circuited to VCC
Pin NamePin No. (TCAN1046A-Q1)Pin No. (TCAN1046AV-Q1)Description of Potential Failure Effect(s)Failure Effect Class
TXD111TXD1 pin stuck high, unable to transmit data to CAN1 bus.B
GND122CAN1 transceiver unpowered, high ICC current.B
VCC13-NoneD
VCC-3NoneD
RXD144RXD1 pin stuck high, unable to receive data from CAN1 bus.B
TXD256TXD2 pin stuck high, unable to transmit data to CAN2 bus.B
GND265CAN2 transceiver unpowered, high ICC current.B
VCC27-NoneD
RXD287RXD2 pin stuck high, unable to receive data for CAN2 bus.B
CANL299CAN2 bus always recessive, no communication possible. IOS current may be reached.B
CANH21010VO(REC) spec violated, degraded EMC performance on CAN2 bus.C
STB2118STB2 stuck high, CAN2 transceiver always in standby mode.B
VIO-11IO pins will operate as 5V input/output. Microcontroller may be damaged if VCC > VIO.C
CANL11212CAN1 bus always recessive, no communication possible. IOS current may be reached.B
CANH11313VO(REC) spec violated, degraded EMC performance on CAN1 bus.C
STB11414STB1 stuck high, CAN1 transceiver always in standby mode.
Table 4-7 PIN FMA for Device Pins Short-Circuited to VIO
Pin NamePin No. (TCAN1046AV-Q1)Description of Potential Failure Effect(s)Failure Effect Class
TXD11TXD1 stuck high, unable to transmit data to CAN1 bus.B
GND12CAN1 unpowered, high IIO current.B
VCC3IO pins will operate as 5V input/output. Microcontroller may be damaged if VCC > VIO.C
RXD14RXD1 pin stuck high, unable to receive data from CAN1 bus.B
GND25CAN2 unpowered, high IIO current.B
TXD26TXD2 stuck high, unable to transmit data to CAN2 bus.B
RXD27RXD2 pin stuck high, unable to receive data from CAN2 bus.B
STB28STB2 stuck high, CAN2 transceiver always in standby mode.B
CANL29CAN2 bus always recessive, no communication possible. IOS current may be reached if VIO ≥ 3.3V. B
CANH210VO(REC) spec violated if VIO ≥ 3.3V, degraded EMC performance on CAN2 bus.C
VIO11NoneD
CANL112CAN1 bus always recessive, no communication possible. IOS current may be reached if VIO ≥ 3.3V. B
CANH113VO(REC) spec violated if VIO ≥ 3.3V, degraded EMC performance on CAN1 bus.C
STB114STB1 stuck high, CAN1 transceiver always in standby mode.B
Table 4-8 Pin FMA for Device Pins Short-Circuited to VBAT
Pin NamePin No. (TCAN1046A-Q1)Pin No. (TCAN1046AV-Q1)Description of Potential Failure Effect(s)Failure Effect Class
TXD111Absolute maximum violation, transceiver may be damaged. Unable to transmit data to CAN1 bus.A
GND122Device unpowered, high IBAT current.B
VCC13-Absolute maximum violation, transceiver may be damaged. CAN1 bus may be unable to communicate.A
VCC-3Absolute maximum violation, transceiver may be damaged. CAN bus may be unable to communicate.A
RXD144Absolute maximum violation, transceiver may be damaged. Unable to receive data from CAN1 bus.A
TXD256Absolute maximum violation, transceiver may be damaged. Unable to transmit data to CAN2 bus.A
GND265Device unpowered, high IBAT current.B
VCC27-Absolute maximum violation, transceiver may be damaged. CAN2 bus may be unable to communicate.A
RXD287Absolute maximum violation, transceiver may be damaged. Unable to receive data from CAN2 bus.B
CANL299CAN2 bus always recessive, no communication possible. IOS current may be reached.B
CANH21010VO(REC) spec violated, degraded EMC performance on CAN2 bus.C
STB2118Absolute maximum violation, transceiver may be damaged. CAN2 transceiver stuck in standby mode.A
VIO-11Absolute maximum violation, transceiver may be damaged.A
CANL11212CAN1 bus always recessive, no communication possible. IOS current may be reached.B
CANH11313VO(REC) spec violated, degraded EMC performance on CAN1 bus.B
STB11414Absolute maximum violation, transceiver may be damaged. CAN1 transceiver stuck in standby mode.A