Data Sheet
Table Of Contents
- 1.General Overview
- 1.1.Introduction
- 1.2.Features
- 1.3.Parameters
- 1.4.Ultra Low Power Technology
- 1.5.Major Applications
- 2.Hardware Overview
- 3.Pins and Definitions
- 3.1.GPIO
- 3.2.Secure Digital Input/Output Interface (SDIO)
- 3.3.Serial Peripheral Interface (SPI/HSPI)
- 3.4.Inter-integrated Circuit Interface (I2C)
- 3.5.I2S
- 3.6.Universal Asynchronous Receiver Transmitter (UART)
- 3.7.Pulse-Width Modulation (PWM)
- 3.8.IR Remote Control
- 3.9.ADC (Analog-to-digital Converter)
- 3.10.LED Light and Button
- 4.Firmware & Software Development Kit
- 5.Power Management
- 6.Clock Management
- 8.FCC Warming Statement
- This device complies with part 15 of the FCC Rules
- (1)This device may not cause harmful interference,
- (2)and this device must accept any interference re
- FCC Radiation Exposure Statement:
- This equipment complies with FCC radiation exposur
- Information to the user.
- Note: This equipment has been tested and found to
- -Reorient or relocate the receiving antenna.
- -Increase the separation between the equipment and
- -Connect the equipment into an outlet on a circuit
- -Consult the dealer or an experienced radio/TV tec
- 9.Appendix: QFN32 Package Size
ESP8266 Datasheet
Espressif Systems
Espressif Systems
June1,2015
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7.1.
Channel Frequencies
The RF transceiver supports the following channels according to the IEEE802.11b/g/n standards.
Table 20 Frequency Channel
Channel No
Frequency (MHz)
Channel No
Frequency (MHz)
1
2412
8
2447
2
2417
9
2452
3
2422
10
2457
4
2427
11
2462
5
2432
6
2437
7
2442
7.2.
2.4 GHz Receiver
The 2.4GHz receiver downconverts the RF signal to quadrature baseband signals and converts them
to the digital domain with 2 high resolution high speed ADCs. To adapt to varying signal channel
conditions, RF filters, automatic gain control (AGC), DC offset cancelation circuits and baseband
filters are integrated withinESP8266EX.
7.3.
2.4 GHz Transmitter
The 2.4GHz transmitter up-converts the quadrature baseband signals to 2.4GHz, and drives the
antenna with a high powered CMOS power amplifier. The use of digital calibration further improves
the linearity of the power amplifier, enabling a state of art performance of delivering +19.5dBm
average power for 802.11b transmission and +16dBm for 802.11n transmission.
Additional calibrations are integrated to cancel any imperfections of the radio, such as:
▪
carrier leakage,
▪
I/Q phase matching, and
▪
baseband nonlinearities
This reduces the amount of time required and test equipment required for production testing.
7.4.
Clock Generator
The clock generator generates quadrature 2.4 GHz clock signals for the receiver and transmitter. All
components of the clock generator are integrated on-chip, including: