Revision History
Revision History
Date Version Release notes
2019.04 V2.7 Updated Figure 6; added notes under the figure.
2019.02 V2.6
Added two-layer PCB design guidelines in Sections Power Supply and RF;
Updated Section UART;
Updated the modules supported on dev boards ESP32-LyraT and ESP32-
LyraTD-MSC according to the latest Espressif Product Ordering Information.
2018.11 V2.5
Updated Section Digital Power Supply: 2 kΩ resistor + 1 µF capacitor close to
VDD_SDIO when it outputs 1.8 V is changed to 2 kΩ resistor + 4.7 µF capacitor.
2018.09 V2.4
Updated Section 2.1.4.1: External Clock Source;
Updated Section 2.1.4.2: RTC.
2018.08 V2.3 Updated Section 2.1.7: External Capacitor.
2018.07 V2.2
Changed the official name of ESP-WROOM-32 into ESP32-WROOM-32;
Changed the official name of ESP-WROOM-32D into ESP32-WROOM-32D.
Updated Chapter 2: Schematic Checklist and PCB Layout Design;
Added new modules and applications based on ESP32.
2018.03 V2.1
Deleted sections introducing protocols, applications, block diagram and pin de-
scription of ESP32, for information of which please refer to ESP32 Datasheet;
Updated all figures and description of schematics and PCB layout in Chapter 2 ;
Added Section 2.1.6 ADC and 2.1.8 UART;
Updated Section 2.2, and added description about Positioning a ESP32 Module
on a Base Board in it.
Updated the value of current ripple in Section 2.2.3.1.
Updated Section ESP32-DevKitC Development Board.
Added Section ESP32-PICO-D4 Module.
Added Section ESP32-WROOM-32D Module.
Added Section ESP32-WROOM-32U Module.
Added Section ESP32-PICO-KIT Mini Development Kit.
Deleted orginal Section 2.1.6 ESP32-PICO-KIT Mini Development Kit.
2017.08 V2.0
Changed the transmitting power to +12 dBm; the sensitivity of NZIF receiver to
-97 dBm in Section Bluetooth;
Added a note to Table Pin Description;
Added Section 2.2.1.8 Touch Sensor;
Updated Chapter 3 Hardware Development;
Updated Section 4.1.1.
2017.06 V1.9
Changed the input power supply range of CPU/RTC IO to 1.8V ~ 3.6V;
Updated Section 2.1.1.1 Digital Power Supply.
2017.06 V1.8
Updated Section 2.1.2.1 Power-on Sequence;
Updated Section 2.1.4.1 External Clock Source (Compulsory);
Added a link to ESP32 Pin Lists;
Added Documentation Change Notification.
2017.05 V1.7 Added a note to Section ESP32-WROOM-32 Overview.
2017.05 V1.6
Updated Figure ESP32-WROOM-32 Pin Layout;
Espressif Systems 24 ESP32 Hardware Design Guidelines V2.7
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