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
28
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Table 18 High Frequency Clock
Parameter
Symbol
Min
Max
Unit
Frequency
FXO
26
52
MHz
Loading capacitance
CL
32
pF
Motional capacitance
CM
2
5
pF
Series resistance
RS
0
65
Ω
Frequency tolerance
ΔFXO
-15
15
ppm
Frequency vs temperature (-25°C ~
75°C)
ΔFXO,Temp
-15
15
ppm
6.2.
External Reference Requirements
For an externally generated clock, the frequency can range from 26MHz to 52MHz can be used. For
good performance of the radio, the following characteristics are expected of the clock:
Table 19 External Clock Reference
Parameter
Symbol
Min
Max
Unit
Clock amplitude
VXO
0.2
1
Vpp
External clock accuracy
ΔFXO,EXT
-15
15
ppm
Phase noise @1kHz offset, 40MHz clock
-120
dBc/Hz
Phase noise @10kHz offset, 40MHz clock
-130
dBc/Hz
Phase noise @100kHz offset, 40MHz clock
-138
dBc/Hz
7.
Radio
The ESP8266EX radio consists of the following main blocks:
•
2.4GHz receiver
•
2.4GHz transmitter
•
High speed clock generators and crystal oscillator
•
Real time clock
•
Bias and regulators
•
Power management