@felmue @mtylerjr thanks for the reference. Looks nice the way it plugs together.
I'm looking at the power system for low power sippping as an IoT device, mostly turned off for the ideal in power savings.
The CoreS3 AXP2101 switch off looks excellent for going into low power mode.
Then on the DIN base the SY8303AIC looks like a nice quiescent power supply - though if its interfacing to a 20V solar panel, would be nice to program the MPP power point with a resistor on the EN.
However, seems like low power hasn't extended to the TP4057 LiIon charger - it has two LEDs - seems the RED is on when charging which could be tolerated, and then the GREEN when its charged - which of course is then using Green LED current as quiescent power.
Thanks again for pointing me at the way if fits together :)

I'm just wondering for the CoreS3 how the 9-24V DC circuit fits in. Its mentioned in the specifications, but I can't find it on the schematic. The schematic V1.0 referenced https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/core/K128 CoreS3/Sch_M5_CoreS3_v1.0.pdf found on https://docs.m5stack.com/en/core/CoreS3
From a low power quiescent current, I'm curious to understand about what the draw is when AXP2101 powered off.

@ajb2k3 said in M5STATION data storage:

DowdQ6

Oww.. thanks for the enlightenment - I hadn't understood the '0' of the ESP32 world
ESP32-DOWDQ6
vs the ESP32-S2 or ESP32-S3
https://docs.espressif.com/projects/espressif-esp-faq/en/latest/hardware-related/chip-comparison.html
I'm revaluating. I need low power sleep (or power off), TF card slot, 3 UARTs, Wall Time RTC , 16MB flash with at least 2MB program space and OTA capability- and that is narrowing to a ESP-S3 and possibly a M5-CoreS3. Though I'm also want to plugin Cell LTE ~ Possibly Cell Modem U128 and RS485/Switched 12V - so needs external power with solar panel.
I liked the switched port power on the M5station - oh well.!
USB OTG would be extensible to have - especially USB Host if the software is available.

Is it possible to have a data store on the Station 485.
I've got the M5STATION for a review, and its mostly very nicely done. Nicely thought out mechanical, really like the switched power on the ports, and the RS485 interface.
I'm trying to figure out how to store data locally. Its data in transit, however if the wireless fails the data needs to be buffered locally till the wireless comes back.
What I'm looking for is a local file system to be a able to store rows in a .csv file.
In other IoT boards its been on a uSD (TF Card) and that's available on other M5s
I thought may the USB TypeA would support a USB stick - however this only switches power to the USB TYPE A, and no data connections - even though the ESP32-S3 seems to have USB OTG.
Thanks for any insights