OSM Size-0 solder-on LGA module comes with ESP32 WiFi & BLE MCU

German embedded systems company iesy’s ESP32 OSM-0F is an ESP32-based solder-on LGA system-on-module that complies with SGET OSM Size-0 (30x15mm) form factor, offers WiFi and Bluetooth connectivity, and more.

The SGET Open Standard Module (OSM) standard defines four module sizes, namely Size-0 (30x15mm), Size-S (30x30mm), Size-M (45x30mm), and Size-L (45x45mm), and all the modules we’ve covered so far were powered by a Linux-capable processor. But it’s more challenging, albeit not impossible, to design a Linux-capable OSM Size-0 module, and that form factor is better suited to microcontroller-class chips like ESP32. (Technically, ESP32 can run Linux, but it’s more for show that any practical applications)

ESP32 OSM-0F specifications:

  • Microcontroller – Espressif ESP32 dual-core Xtensa LX6 MCU @ 240 MHz with 512KB RAM, Wi-Fi 802.11 b/g/n and Bluetooth/BLE
  • Storage – 32 Mbit SPI flash
  • Antenna – u.FL connector
  • 188 LGA contact points with
    • Storage – SDIO
    • Networking – 1x 10/100M Ethernet (RMII), MAC compatible with IEEE 802.3
    • Other I/Os – SPI, I2C, ADC, GPIO, PWM
    • A fair amount of pins that are not connected at all
  • Misc – RTC
  • Supply Voltage – 3.3 V DC-Input (± 5%)
  • Power Consumption – <1 W (typ.)
  • Dimensions – 30 x 15 mm (OSM Size-0 Land Grid Array (LGA), solder-on modules with 188 contact points
  • Temperature Range – Operating: -40°C up to +80°C; storage: -40°C up to +85°C

iesy lists FreeRTOS-based Espressif IDE (that should be the ESP-IDF) and PlatformIO for software development.

While it’s nice to have a standardized form factor for potential design upgrades down the road or multiple product offerings, many existing ESP32 modules are already smaller, and there should be quite a lot of pins that are unused in the OSM Size-0 module when using the 48/49-pin ESP32 WiSoC. But that’s just the first Size Zero module that I could find, and more may be released soon.

More details about the ESP32 OSM-0F module may be found on the product page.

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2 Replies to “OSM Size-0 solder-on LGA module comes with ESP32 WiFi & BLE MCU”

  1. I fail to see what this module offers over Espressif’s ones, especially since Espressif’s ones also include RF-shielding as well.

    1. My thoughts exactly. Seems like a tiny market. And why didn’t they just utilize a normal esp32? Tiny bit cheaper per module, I suppose..

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