Data Sheet

Contents
1 Overview 1
2 Pin Definitions 3
2.1 Pin Layout 3
2.2 Pin Description 4
2.3 Strapping Pins 5
3 Functional Description 7
3.1 CPU and Internal Memory 7
3.2 External Flash and SRAM 7
3.3 Crystal Oscillators 7
3.4 RTC and Low-Power Management 8
4 Peripherals and Sensors 10
4.1 Peripherals and Sensors Description 10
5 Electrical Characteristics 15
5.1 Absolute Maximum Ratings 15
5.2 Wi-Fi Radio 15
5.3 BLE Radio 16
5.3.1 Receiver 16
5.3.2 Transmitter 16
5.4 Reflow Profile 17
6 Schematics 18
7 Peripheral Schematics 19
8 Dimensions 20
9 Learning Resources 21
9.1 Must-Read Documents 21
9.2 Must-Have Resources 21