Espressif ESP8266 Series User Manual

ESP-WROOM
3. ESP-WROOM
Espressif provides two types of modules, SMD module (ESP-WROOM-02) and DIP module
(ESP-WROOM-01). The modules have received various adjustments to achieve the optimum
RF functionality. It is recommended to use these modules for test or further development.
3.1.
SMD Module ESP-WROOM-02
The pin distribution of the SMD Module is illustrated in Figure 16. The external size of the
module is 18 mm x 20 mm. The type of flash used on this module is an SPI flash with package
size SOP8-150 mil. The antenna applied on this module is a 2 dBi PCB-on-board antenna.

Figure 3-1: Top View of ESP-WROOM-02
20.00
18.00
5.90
13.35
1.20
1.50
0.60
0.90
5.73
0.85
4.17
4.30
4.30
PCB ANTENNA
GND
IO16
TOUT
RST
IO5
GND
TXD
RXD
IO4
3V3
EN
IO14
IO12
IO13
IO15
IO2
IO0
GND
Unit: mm
Espressif
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2016.06

Espressif ESP8266 Series Specifications

General

RAM	50 KB
Wi-Fi	802.11 b/g/n
GPIO Pins	17
ADC	1
ADC Resolution	10-bit
I2S	Yes
Operating Temperature	-40°C to +125°C
Clock Speed	80 MHz (can be overclocked to 160 MHz)
Flash Memory	External, up to 16 MB
Operating Voltage	3.0V to 3.6V
I2C	Yes (software implementation)
UART	2
Deep Sleep Power Consumption	10 µA
Dimensions	Varies depending on module
Processor	Tensilica L106 32-bit