Data Sheet

Table of Contents
1. Feature List ................................4
2. Typical Applications ............................5
3. Design Guidelines .............................6
3.1 PCB Layout Recommendations ........................6
3.2 Power Supply Recommendations........................6
3.3 Software Application-Related Options ......................6
3.4 Firmware Updating Related Recommendations ...................7
4. Pin-Out Description .............................8
4.1 Power, Ground, Reset, and GPIO Pins ......................8
4.2 GPIO Pins ...............................9
5. Power Control ..............................10
5.1 Power Supply Requirements .........................10
5.2 Power Saving Functionality ..........................10
5.2.1 Power Mode 1.............................10
5.2.2 Power Mode 2.............................10
5.2.3 Wake-Up Pin Functionality ........................11
5.3 Reset .................................11
6. Interface ................................12
6.1 GPIO .................................12
6.2 UART .................................12
6.3 I
2
C ..................................12
6.4 ADC .................................12
6.5 Real-Time Clock .............................12
6.6 Microcontroller Programming Interface ......................12
7. Antenna ................................13
7.1 Measured Antenna Efficiency .........................13
7.2 Measured 2D Radiation Patterns ........................15
7.3 Measured 3D Radiation Patterns ........................18
8. Bluetooth
®
Software Stack .........................20
9. Host Interface ..............................21
9.1 UART .................................21
10. Connection Examples ..........................22
10.1 Connecting an External Host Using the UART Interface................22
10.2 Connecting an External Device Using I
2
C Interface .................23
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