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Flash size

Posted: Wed Jun 27, 2018 4:47 pm
by mikeatom
Hi !

Got a batch of ESP-WROOM-02 modules through production that we thought were 2MB.

Reel markings are:

Code: Select all

Product Name: ESP-WROOM-02
Manufacturer PN: 04.09.0000740
Supplier PN: M021X0132R0E
LOT No.: 201812-066
Manufacture Date: 2018-03-21


However, esptool.py flash_id command reports the flash as 4MB, C8/4016.

Some comments about interpreting the flash_id here: https://www.esp8266.com/viewtopic.php?p=31787


The supplier ID includes "32" which might signify the flash size?

Can anyone categorically confirm the flash size in these modules, according to the manufacturer or supplier PN?
And if these are 4MB, then is that temporary (as I thought all modules were 2MB nowadays?).
And what PN would be expected on the reel packaging, when the modules do contain 2MB chips... M021X0116R0E perhaps?

Any help really appreciated!

Re: Flash size

Posted: Mon Jul 09, 2018 8:52 pm
by inlogic
ESP-WROOM-02 is a low-power 32-bit MCU Wi-Fi module, based on the ESP8266 chip. TCP/IP network stacks, 10-bit ADC, and HSPI/UART/PWM/I2C/I2S interfaces are all embedded in this module.
ESP-WROOM-S2 uses a 2 MB SPI flash connected to HSPI, working as SDIO/SPI slave, with the SPI speed being up to 8 Mbps.