User's Manual
Table Of Contents
- Product Introduction
- 1.1 Overview
- 1.2 Features
- 1.3 Product Diagram
- 1.4 Appearance
- 1.5 Specification
- 1.6 Interface Definition
- 1.7 Electrical Features
- 1.8 Digital Port Features
- Hardware Design Notice
- 2.1 Application Diagram
- 2.2 GPIO
- 2.3 UART
- 2.4 Design requirement of practical application
- 2.4.1 Reset Sequence
- 2.5 Power Supply Interface
- 2.6 RF Input and Output Interface
- 2.7 Dimension
- 2.8 No wiring area
- Approval and Certification
- Disclaimer
UART1: IO2(TXD)
UART0 output printing information by ESP8266EX in default. Developers
can user the internal exchange function of UART to interchange U0TXD,
U0RXD and U0RTS
，
U0CTS at the time of initialization, To connect MTDO
and MTCK to corresponding UART of external MCU.
I2S
I2S Input:
IO12 (I2SI_DATA) ;
IO13 (I2SI_BCK );
IO14 (I2SI_WS);
It is utilized for audio collection, process and transmission.
I2S Output:
IO15 (I2SO_BCK );
IO3 (I2SO_DATA);
IO2 (I2SO_WS).
1.7 Electrical Features
Table 1- 5 Electrical features
Rated Value
Condition
Range
Unit
VCC
IPC/JEDEC J-STD-020
+3.0 to +3.6
V
VESD
ESD Protection (HBM)
2000
V
1.8 Digital Port Features
Table 1- 6 Data port features
Port
Typical Value
Minimum
Typical Value
Maximum
Unit
Input Logical Level Low
VIL
-0.3
0.25VDD
V
Input Logical Level High
VIH
0.75VDD
VDD+0.3
V
Output Logical Level Low
VOL
N
0.1VDD
V
Output Logical Level High
VOH
0.8VDD
N
V