Hardware Development; Esp32-Pico-D4 Module; Esp32-Wroom-32(Esp-Wroom-32) Module - Espressif Systems ESP32 Hardware Design Manuallines

3. HARDWARE DEVELOPMENT

3. Hardware Development
Note:
For more information on ESP32 modules, please refer to the webpage

3.1 ESP32-PICO-D4 Module

The ESP32-PICO-D4 is a System-in-Package (SIP) module that is based on ESP32, providing complete Wi-Fi
and Bluetooth functionalities. The module has a size as small as 7.0±0.1 mm×7.0±0.1 mm×0.94±0.1 mm, thus
requiring minimal PCB area. The module integrates a 4-MB SPI flash.
At the core of this module is the ESP32 chip*, which is a single 2.4 GHz Wi-Fi and Bluetooth combo chip designed
with TSMC's 40 nm ultra-low power technology. ESP32-PICO-D4 integrates all peripheral components seamlessly,
including a crystal oscillator, flash, filter capacitors and RF matching links in one single package. No other peripheral
components except antenna is needed. To improve the RF performance, a RF circuit can be added between
ESP32-PICO-D4 and the external antenna. For details of RF matching, please refer to Section 2.1.5.
For more details on ESP32-PICO-D4, please refer to

3.2 ESP32-WROOM-32(ESP-WROOM-32) Module

Espressif provides users with an SMD module, the ESP32-WROOM-32(ESP-WROOM-32) . This module has been
adjusted to achieving the optimum RF performance.
The size of the module is 18±0.2 x 25.5±0.2 x 3.1±0.15 (mm). The flash used is in an SOP8-208 mil package.
The on-board PCB antenna has a gain of 2 dBi.
Figure 21 shows the front and the rear side of the module.
For more information on the module's pin definition, physical dimensions, schematics, etc, please refer to
WROOM-32(ESP-WROOM-32)
Espressif Systems
ESP32-PICO-D4
Figure 20: ESP32-PICO-D4 Module
Datasheet.
23
Espressif Modules.
Datasheet.
ESP32 Hardware Design Guidelines V2.1
ESP32-