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Issue #1926

Maxim Power Management ICs: find how much mA it can provide, and check if it's configurable

Added by Denis 'GNUtoo' Carikli 14 days ago. Updated 14 days ago.

Status:
New
Priority:
Normal
Category:
Wi-Fi
Target version:
Start date:
05/06/2019
Due date:
% Done:

0%

Spent time:
Resolution:
Device:

Description

It's worth understanding more the characteristics of the MAX8997 and the MAX77693.

This could help in understanding if and how we can make external USB devices more reliable. That is needed as the internal WiFi chips don't work with free software at the time of writing.

The MAX8997 is used at least in the Galaxy SII (I9100) and the MAX77693 is used at least in the Galaxy SIII (i9300), Galaxy SIII 4G (i9305), the Galaxy Note 2 (N7100) and the Galaxy Note (N7100).

Some more background information can be found in the WiFi wiki page.

History

#1 Updated by Denis 'GNUtoo' Carikli 14 days ago

Moving forward:
  • Since no documentation can be found on the Maxim Power Management ICs (PMICs) it is a good idea to do some measures to find the maximum amount of mA that can be delivered by measuring it.
  • The MAX77860 has a configurable current limit for USB OTG. It is configurable through the OTG_ILIM register which sets the limit when the device is in current sink and current source modes. It might be interesting to do some measurements and see if the chips mentioned above are similar enough and to check if the charging limit has an effect on how much mA can be delivered through the USB port in current source mode.

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