Data Sheet

Contents
1 Overview 1
2 Pin Definitions 3
2.1 Pin Layout 3
2.2 Pin Description 3
2.3 Strapping Pins 5
3 Functional Description 6
3.1 CPU and Internal Memory 6
3.2 External Flash and SRAM 6
3.3 Crystal Oscillators 6
3.4 RTC and Low-Power Management 7
4 Peripherals and Sensors 8
5 Electrical Characteristics 9
5.1 Absolute Maximum Ratings 9
5.2 Recommended Operating Conditions 9
5.3 DC Characteristics (3.3 V, 25 °C) 9
5.4 Wi-Fi Radio 10
5.5 BLE Radio 11
5.5.1 Receiver 11
5.5.2 Transmitter 11
5.6 Reflow Profile 12
6 Schematics 13
7 Peripheral Schematics 15
8 Physical Dimensions 17
9 Recommended PCB Land Pattern 19
10U.FL Connector Dimensions 20
11Learning Resources 21
11.1 Must-Read Documents 21
11.2 Must-Have Resources 21
Revision History 22