Table of Contents

1. Overview

1

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1.1. Wi-Fi Key Features

1

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1.2. Specifications

2

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1.3. Applications

3

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2. Pin Definitions

4

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3. Functional Description

6

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3.1. CPU, Memory, and Flash

6

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3.1.1. CPU

6

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3.1.2. Memory

6

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3.1.3. External Flash

7

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3.2. Clock

7

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3.2.1. High Frequency Clock

7

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3.2.2. External Clock Requirements

8

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3.3. Radio

8

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3.3.1. Channel Frequencies

8

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3.3.2. 2.4 GHz Receiver

9

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3.3.3. 2.4 GHz Transmitter

9

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3.3.4. Clock Generator

9

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3.4. Wi-Fi

9

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3.4.1. Wi-Fi Radio and Baseband

9

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3.4.2. Wi-Fi MAC

10

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3.5. Power Management

10

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4. Peripheral Interface

12

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4.1. General Purpose Input/Output Interface (GPIO)

12

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4.2. Secure Digital Input/Output Interface (SDIO)

12

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4.3. Serial Peripheral Interface (SPI/HSPI)

13

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4.3.1. General SPI (Master/Slave)

13

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4.3.2. HSPI (Slave)

13

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4.4. I2C Interface

14

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4.5. I2S Interface

14

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4.6. Universal Asynchronous Receiver Transmitter (UART)

14

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4.7. Pulse-Width Modulation (PWM)

15

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4.8. IR Remote Control

16

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4.9. ADC (Analog-to-Digital Converter)

16

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