Espressif ESP01 Quick Start Manual page 2

1 . OVERVIEW
1. Overview
ESP01 is a powerful, generic Wi-Fi MCU module that targets a wide variety of applications,
ranging from low-power sensor networks to the most demanding tasks, such as voice encoding, music streaming
and MP3 decoding. ESP01 integrates a U.FL connector.
At the core of this module is the ESP32-D0WD chip*. The chip embedded is designed to be scalable and adaptive.
There are two CPU cores that can be individually controlled, and the clock frequency is adjustable from 80 MHz
to 240 MHz. The user may also power off the CPU and make use of the low-power co-processor to constantly
monitor the peripherals for changes or crossing of thresholds. ESP32 integrates a rich set of peripherals, ranging
from capacitive touch sensors, Hall sensors, low-noise sense amplifiers, SD card interface, Ethernet, high-speed
SPI, UART, I2S and I2C.
Note:
* For details on the part number of the ESP32 series, please refer to the document
The sleep current of the ESP32 chip is less than 5 µA, making it suitable for battery powered and wearable
electronics applications. As such the chip does offer industry-leading specifications and the best performance
for electronic integration, range, power consumption, and connectivity.
The operating system chosen for ESP32 is freeRTOS with LwIP; TLS 1.2 with hardware acceleration is built in as
well. Secure (encrypted) over the air (OTA) upgrade is also supported, so that developers can continually upgrade
their products even after their release.
Table 2 provides the specifications of ESP01
Categories Items
Protocols
Wi-Fi
Frequency range
Table 2: ESP01 Specifications
Specifications
802.11 b/g/n/e/i (802.11n up to 150 Mbps)
A-MPDU and A-MSDU aggregation and 0.4 µs guard
interval support
2412~2462 MHz
ESP32 Datasheet.