ESP32 Forum

Posted: **Tue Jul 05, 2022 3:26 pm**

Dear Community,

I have seen the device ESP32-S3-WROOM-2-N32R8V is actually available on different distributors. So, I'd like to know if this device is an engineering sample or is a finished product. Also what is the difference between version 1 and 2?

Many thanks in advance for any help you can provide.

Posted: **Wed Jul 06, 2022 12:39 am**

I can't comment on the status of the product, sorry. Differences between wroom-1 and wroom-2 are mostly that the wroom-2 uses an external (flash or psram) chip that has an octal SPI interface so the modules PCB is different, hence the change in model number. If you want octal flash and octal psram, use a wroom-2, if you can live with quad flash for one of the two, you can pick a wroom-1.

Posted: **Wed Jul 06, 2022 10:39 am**

Just a couple of notes on the wroom-2...
* GPIOs 35, 36, and 37 are used to support the octal internal SPI and aren't available for general use.
* The internal SPI voltage is 1.8v, not 3.3v (not usually a concern).

Startup does emit some warnings indicating that timings will be updated in the future but I've not encountered any problems yet.

Code: Select all

W (350) FLASH: DO NOT USE FOR MASS PRODUCTION! Timing parameters will be updated in future IDF version.
I (357) octal_psram: vendor id    : 0x0d (AP)
I (357) octal_psram: dev id       : 0x02 (generation 3)
I (360) octal_psram: density      : 0x03 (64 Mbit)
I (366) octal_psram: good-die     : 0x01 (Pass)
I (371) octal_psram: Latency      : 0x01 (Fixed)
I (376) octal_psram: VCC          : 0x00 (1.8V)
I (381) octal_psram: SRF          : 0x01 (Fast Refresh)
I (387) octal_psram: BurstType    : 0x01 (Hybrid Wrap)
I (393) octal_psram: BurstLen     : 0x01 (32 Byte)
I (398) octal_psram: Readlatency  : 0x02 (10 cycles@Fixed)
I (405) octal_psram: DriveStrength: 0x00 (1/1)
W (410) PSRAM: DO NOT USE FOR MASS PRODUCTION! Timing parameters will be updated in future IDF version.
I (427) esp_psram: Found 8MBit SPI RAM device
I (427) esp_psram: Speed: 120MHz

Posted: **Wed Jul 06, 2022 2:09 pm**

gtjoseph wrote: ↑
Wed Jul 06, 2022 10:39 am
* GPIOs 35, 36, and 37 are used to support the octal internal SPI and aren't available for general use.

Note that this is also true for WROOM-1 modules that use octal flash or PSRAM.

Posted: **Wed Jul 06, 2022 3:02 pm**

ESP_Sprite wrote: ↑
Wed Jul 06, 2022 2:09 pm

gtjoseph wrote: ↑
Wed Jul 06, 2022 10:39 am
* GPIOs 35, 36, and 37 are used to support the octal internal SPI and aren't available for general use.
Note that this is also true for WROOM-1 modules that use octal flash or PSRAM.

Ah that makes sense. I also use the DevKit C boards with the quad modules and the fact that those gpios aren't available for the octal modules had me scratching my head for a full day.

ESP32 Forum

ESP32-S3-WROOM-2-N32R8V engineering sample or finished product???

ESP32-S3-WROOM-2-N32R8V engineering sample or finished product???

Re: ESP32-S3-WROOM-2-N32R8V engineering sample or finished product???

Re: ESP32-S3-WROOM-2-N32R8V engineering sample or finished product???

Re: ESP32-S3-WROOM-2-N32R8V engineering sample or finished product???

Re: ESP32-S3-WROOM-2-N32R8V engineering sample or finished product???