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ZHCSPU9 February 2024 TCAN1465-Q1 , TCAN1469-Q1

ADVANCE INFORMATION

封裝選項

機械數據 (封裝 | 引腳)

DMT|14
- MPSS087B
D|14
- MPDS177H

散熱焊盤機械數據 (封裝 | 引腳)

訂購信息

zhcspu9_oa

8.4.8 Bus Fault Detection and Communication (TCAN1469-Q1)

The TCAN1469-Q1 provide advanced bus fault detection. The device can determine certain fault conditions and set a status/interrupt flag so that the MCU can understand what the fault is. Detection takes place and is recorded if the fault is present during four dominant to recessive transitions with each dominant bit being ≥ 2μs. As with any bus architecture where termination resistors are at each end not every fault can be specified to the lowest level, meaning exact location. The fault detection circuitry is monitoring the CANH and CANL pins (currents) to determine if there is a short to battery, short to ground, short to each other or opens. From a system perspective, the location of the device can impact what fault can be detected. See Figure 8-34 as an example of node locations and how they can impact the ability to determine the actual fault location. Figure 8-35 through Figure 8-39 show the various bus faults based upon the three node configuration. Table 8-17 shows what can be detected and by which device.

Bus fault detection is a system-level situation. If the fault is occurring at the ECU then the general communication of the bus is compromised. For complete coverage of a node a system level diagnostic step for each node and the ability to communicate this back to a central point is needed.

Figure 8-34 Three-Node Example

Figure 8-35 Open Fault 2 Examples

Fault 2 is any case where no termination is seen

Figure 8-36 Open Fault 3 and 4 Examples

Figure 8-37 Fault 5 and 6 Examples

Figure 8-38 Fault 7, 8 and 9 Examples

Figure 8-39 Fault 10 and 11 Examples

Table 8-17 Bus Fault Pin State and Detection Table

Fault #	CANH	CANL	Fault Detected
2	Open	Open	Depending upon open location the device detects this as no termination.
3	Open	Normal	Yes, but cannot tell the difference between Fault 3 and Faults 2 and 4; Device 2 and Device 3 does not see this fault
4	Normal	Open	Yes, but cannot tell the difference between Fault 4 and Faults 2 and 3; Device 2 and Device 3 does not see this fault
5	Shorted to CANL	Shorted to CANH	Yes, but not location
6	Shorted to V_bat	Normal	Yes, but not location
7	Shorted to GND	Normal	Yes, but cannot tell the difference between this and Fault 10
8	Normal	Shorted to V_bat	Yes, but cannot tell the difference between this and Fault 11
9	Normal	Shorted to GND	Yes, but not location
10	Shorted to GND	Shorted to GND	Yes, but cannot tell the difference between this and Fault 7
11	Shorted to V_bat	Shorted to V_bat	Yes, but cannot tell the difference between this and Fault 8

Table 8-18 Bus Fault Interrupt Flags Mapping to Fault Detection Number

Address	BIT(S)	DEFAULT	FLAG	DESCRIPTION	FAULT DETECTED	ACCESS
8'h54	7	1'b0	RSVD	Reserved
	6	1'b0	RSVD	Reserved
	5	1'b0	CANHCANL	CANH and CANL Shorted Together	Fault 5	R/WC
	4	1'b0	CANHBAT	CANH Shorted to V_BAT	Fault 6	R/WC
	3	1'b0	CANLGND	CANL Shorted to GND	Fault 9	R/WC
	2	1'b0	CANBUSOPEN	CAN Bus Open (One of three possible places)	Faults 2, 3 and 4	R/WC
	1	1'b0	CANBUSGND	CANH Shorted to GND or Both CANH & CANL Shorted to GND	Faults 7 and 10	R/WC
	0	1'b0	CANBUSBAT	CANL Shorted to V_BAT or Both CANH & CANL Shorted to V_BAT	Faults 8 and 11	R/WC