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OSD32MP1-BRK

Open drain buffer output pull-up on warm reset circuit?

Hi,

I love the OSD3358-512M-BSM, I’m planning on making a small board with it. I’ve been going through your site’s very useful design tutorial. Currently, I’m working on the reset circuit, specifically the warm reset. I’ve used this page as a reference:

https://octavosystems.com/app_notes/osd335x-design-tutorial/bare-minimum-boot/reset-circuitry/

There is something that I’m not clear about. The output if the SN74LVC1G07  is attached to the APX811’s MR# pin. I don’t see a pull up for the output of the open drain buffer. It doesn’t look like it’s being pulled up anywhere. I looked through both of the datasheets for the parts and I don’t see any declared internal current pullup. Perhaps I missed it. I’d like to know if I’ve missed something.

I’m planning on adding a 10K pull up to SYS_VDD1_3P3.

Thanks again for the part and the documentation.

Dave

Industrial HVAC Controller System in Package Based on AM335x

Software Power Management with the OSD335x Family

In a previous article, we discussed the hardware aspects associated with power management and power budgeting for the OSD335x. However, to optimize the power performance of your design you must also fine tune the power usage of the AM335x inside the OSD335x through software. Using firmware to control the power management of the OSD335x leads to significant power savings in some applications. This document introduces software power management techniques for the OSD335x in Linux and provides examples to demonstrate the advantages of these techniques. (Read More…)

OSD335x Power Management

Introduction

This article is the third part of the OSD335x Reference Design Lesson 1 Power circuitry articles. It will mainly focus on topics related to control and management of power for the OSD335x. As we discuss the power circuitry, we will build the schematics and layout the corresponding traces.

(Read More…)

Software Power Management with the OSD335x Family

Debian image vs openSTLinux image : power management

Hello,

We are working on a future board based on OSD32MP1, so we are currently testing it on the dev board OSD32MP1-BRK. We have used the image “OSD32MP1-BRK OpenSTLinux | Version: 2.0 | September 23, 2020” for our first test. When we do the following command :
# echo mem > /sys/power/state
we notice a drop in power consumption, in the same way as when we do the following command: # echo mem > /sys/power/state
# shutdown -h 0
When using the image “OSD32MP1-BRK Octavo Systems Debian 10 | Version: Release 1.2 | May 08, 2020” the following command does not work:
# echo mem > /sys/power/state
For the “shutdown” command, it works but there is no change in the power consumption.
Is there any driver or modification to make to the Debian image to have the same power management functionality as on the openSTLinux image?
Sincerely

Path to Systems: System in Package Technology Article Series

OSD335x BAS/IND to OSD335x-SM Migration Guide

OSDZU3 Layout Guide