Data Sheet

Contents
1 Overview 1
2 Block Diagram 3
3 Pin Definitions 4
3.1 Pin Layout 4
3.2 Pin Description 4
3.3 Strapping Pins 6
4 Functional Description 8
4.1 CPU and Internal Memory 8
4.2 External Flash and SRAM 8
4.3 Crystal Oscillators 8
4.4 RTC and Low-Power Management 9
5 Peripherals and Sensors 10
6 Electrical Characteristics 11
6.1 Absolute Maximum Ratings 11
6.2 Recommended Operating Conditions 11
6.3 DC Characteristics (3.3 V, 25 °C) 11
6.4 Wi-Fi Radio 12
6.5 BLE Radio 13
6.5.1 Receiver 13
6.5.2 Transmitter 13
6.6 Reflow Profile 14
7 Schematics 15
8 Peripheral Schematics 17
9 Physical Dimensions 18
10 Recommended PCB Land Pattern 19
11 U.FL Connector Dimensions 20
12 Learning Resources 21
12.1 Must-Read Documents 21
12.2 Must-Have Resources 21
Revision History 23