Power ManagementのトピックRe: TJA1043 VBAT Pin

TJA1043 VBAT Pin

Jeetkumar123 — Thu, 06 Jun 2024 09:48:02 GMT

Hi NXP support Team,

I have a doubt regading for VBAT pin in this part TJA1043. Please let me know the function of VBAT pin. In the datasheet there some point i got. but couldn't understand proper function of this PIN.

thank you

Re: TJA1043 VBAT Pin

JozefKozon — Thu, 06 Jun 2024 11:32:30 GMT

Hi Jitendra,

the TJA1043 is intended to be used mainly in automotive. There are usually 12V lead batteries available. It's just a supply pin. The VBAT can withstand voltage up to 40V.

With Best Regards,

Jozef

Re: TJA1043 VBAT Pin

Jeetkumar123 — Fri, 07 Jun 2024 04:36:37 GMT

Hi JozefKozon,

Thank you for your reply, but i didn't get you. What will happen if i leave VBAT pin float??

Re: TJA1043 VBAT Pin

JozefKozon — Fri, 07 Jun 2024 06:51:13 GMT

Hi Jitendra,

please refer to the section 7.2.2 in the TJA1043 datasheet. If you leave the VBAT floating, the UVbat flag will be set. If both VDD and VDDIO will be supplied, the TJA1043 will switch to Standby mode. You will not be able to set the TJA1043 to Normal mode if the VBAT will be not powered.

With Best Regards,

Jozef