Power ManagementのトピックRe: Reserve Power Circuit for LS1012A Design

Reserve Power Circuit for LS1012A Design

joseph_lindula — Tue, 05 Mar 2019 17:07:54 GMT

Hello, I am designing a small board with the LS1012A ARM Processor. The board will likely consume about 16W of power. I will need to design a reserve power circuit to supply power to the board for a short amount of time. Does NXP have any devices that I could use to monitor the input power and switch over to some supercaps to provide a short time of power to the board, say 2 seconds or so, enough time for the Processor to finish what it was doing and go through the power down sequence of the Linux OS.

Thanks,

Joe

Re: Reserve Power Circuit for LS1012A Design

reyes — Tue, 05 Mar 2019 19:46:57 GMT

Hi Joe,

There is a reference design board for the QorIQ LS1012A using the VR5100 as the power management IC I charge of powering the system according to the LS1012A requirements, you can find details of the reference design in the reference manual that you can download from the following link: https://www.nxp.com/support/developer-resources/software-development-tools/qoriq-developer-resources/qoriq-ls1012a-reference-design-board:LS1012A-RDB?tab=Documentation_Tab

Plus, you can find the schematic and board design files by downloading the LS1012ARDB-PB Design files (REV D) on the following link: https://www.nxp.com/support/developer-resources/software-development-tools/qoriq-developer-resources/qoriq-ls1012a-reference-design-board:LS1012A-RDB?tab=Design_Tools_Tab

The VR5100 have an integrated circuit used as battery backup:

From the On mode, when the voltage at VIN drops below the undervoltage falling threshold, UVDET, the state machine transitions to the Coin Cell mode.

The LICELL pin provides for a connection of a coin cell backup battery or a “super” capacitor. If the voltage at VIN goes below the VIN threshold (VTL1), contact-bounced, or removed, the coin cell maintained logic is powered by the voltage applied to LICELL.

Check the VR5100 datasheet for more details: https://www.nxp.com/docs/en/data-sheet/VR5100.pdf

Have a great day,
Jose

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Re: Reserve Power Circuit for LS1012A Design

joseph_lindula — Tue, 05 Mar 2019 20:13:04 GMT

Jose,

Hello, thank you very much for responding to my post. This is very helpful.

Have a great day,

Joe

Re: Reserve Power Circuit for LS1012A Design

joseph_lindula — Wed, 06 Mar 2019 04:44:21 GMT

Hello, do you know the power consumption for the LS1012ARDB-PB Development board? I find it very exciting that it use Power Over Ethernet.

Joe

Re: Reserve Power Circuit for LS1012A Design

reyes — Wed, 06 Mar 2019 16:27:06 GMT

Hi Joe,

The LS1012A by itself have a 1W typical power dissipation, unfortunately I do not have access to the total power consumption of the LS1012ARDB-PB Development board, but you can enter a new community thread in the QorIQ community to ask this question, you can find this community in the following link: https://community.nxp.com/community/qoriq?tid=community

Have a great day,
Jose