Data Sheet
Table Of Contents
- 1. Feature List
- 2. Ordering Information
- 3. System Overview
- 4. Electrical Characteristics
- 4.1 Absolute Maximum Ratings
- 4.2 General Operating Conditions
- 4.3 MCU Current Consumption with 3 V Supply
- 4.4 Radio Current Consumption with 3 V Supply
- 4.5 RF Transmitter General Characteristics for the 2.4 GHz Band
- 4.6 RF Receiver General Characteristics for the 2.4 GHz Band
- 4.7 RF Receiver Characteristics for Bluetooth Low Energy in the 2.4 GHz Band 1 Mbps Data Rate
- 4.8 RF Receiver Characteristics for Bluetooth Low Energy in the 2.4 GHz Band 2 Mbps Data Rate
- 4.9 RF Receiver Characteristics for Bluetooth Low Energy in the 2.4 GHz Band 500 kbps Data Rate
- 4.10 RF Receiver Characteristics for Bluetooth Low Energy in the 2.4 GHz Band 125 kbps Data Rate
- 4.11 High-Frequency Crystal
- 4.12 Low Frequency Crystal Oscillator
- 4.13 Precision Low Frequency RC Oscillator (LFRCO)
- 4.14 GPIO Pins
- 4.15 Microcontroller Peripherals
- 4.16 Typical Performance Curves
- 5. Reference Diagrams
- 6. Pin Definitions
- 7. Design Guidelines
- 8. Package Specifications
- 9. Soldering Recommendations
- 10. Tape and Reel
- 11. Certifications
- 12. Revision History
7.3 Radio Performance vs. Carrier Board Size
For many applications, the carrier board size is determined by the overall form factor or size of the additional circuitry. The recommen-
ded carrier board width of 50 mm is thus not always possible in the end-application. If another form factor is required, the antenna per-
formance of the integrated antenna will be compromised but it may still be sufficiently good for providing the required link quality and
range of the end-application. Figure 7.6 Efficiency of the Integrated Antenna as Function of the Carrier Board Size on page 36 shows
the total efficiency of the integrated antenna for different carrier board sizes. As can be seen the best performance is achieved for the
carrier board size of 50 mm x 30 mm with relatively constant performance for larger boards and rapidly declining performance for small-
er boards.
The performance of all the sizes tested will be adequate for more than 15 m line-of-sight range and all of the sizes are thus usable.
WARNING: Any antenna tuning or change of the loop dimensions will void the modular certification of modules with modular
certification. In that case, a Permissions Change to the modular approval is required.
Figure 7.6. Efficiency of the Integrated Antenna as Function of the Carrier Board Size
7.4 Proximity to Other Materials
Placing plastic or any other dielectric material directly in contact with the antenna may cause performance degradation. A clearance of
minimum 0.5 mm is recommended to avoid excessive detuning of the antenna. Solder mask, conformal coating, and other thin dielec-
tric layers are acceptable directly on top of the antenna region. Any metallic objects in close proximity to the antenna will prevent the
antenna from radiating freely. The minimum recommended distance of metallic and/or conductive objects is 10 mm in any direction
from the antenna except in the directions of the application PCB ground planes.
7.5 Proximity to Human Body
Placing the module in contact with or very close to the human body will negatively impact antenna efficiency and reduce range. Further-
more, additional certification may be required if the module is used in a wearable device.
BGM220S Wireless Gecko Bluetooth Module Data Sheet
Design Guidelines
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