TPS65381A-Q1: some questions about TPS65381A-Q1

JW71826,

E2E questions:
1. Because the power supply of CAN is provided by VDD5, how is the CANWU wake-up function implemented?
Answer: The TPS65381A-Q1 is designed to be used with a 14 pin CAN transceiver with the integrated low power wake up circuit and INH output pin. These type of CAN XCVRs run the low power wake up from VBAT and then wake the PMIC up with the CAN XCVR INH output to PMIC CANWU input pin. An example of such a can transceiver is the TCAN1043.

2. whether TPS65381A-Q1 can reach the ASIL-D level?
Answer -> IC devices are not rated for ASIL, the ISO 26262 standard and ASIL ratings are system level standards. IC’s such as this PMIC are Safety Elements out of Context (SEooC) and have diagnostics and features to help systems reach a targeted ASIL level when the IC is used in way close to the assumptions of use (AoU) and diagnostic coverage assumptions matching the SEooC assumptions. This device was developed in parallel to the ISO 26262 standard and has been released as a SafeTI-QM device with supporting documentation to help customers use the SEooC in their systems and make the analysis if it can help the customer reach their targeted system ASIL level. This device would be integrated into the end system via Clause 13 of Part 8 in ISO 26262. This device has been used in safety systems that have been certified up to ASIL-D when it is used in the system where the SEooC diagnostics and functions and the assumptions of use align with the system requirements and design.

3. Can you list some successful cases about the application of TPS65381A-Q1 to automotive brake booster system?
Answer -> TI doesn’t give out specific success stories in public forums. This device is widely used and in high volume production in automotive systems including braking applications.

4. Can you provide a reference circuit for braking booster system used TPS65381A-Q1?
Answer -> TI doesn’t have a reference design for brake booster. However since this PMIC is a safety element out of context (SEooC), the SEooC example application is EPS which is another motor control type application. Thus, the use of the PMIC in a brake booster system should be very similar since the PMIC supplies and monitors the functional safety MCU plus sensors. These MCUs and sensors should be very similar in use between the applications. This information is in the datasheet and safety manual.

Let me know If I can be of further assistance.