Data Sheet

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BDE Technology Inc.
BDE-WF3235
BDE Dual-Band WiFi MCU Module
Datasheet
Datasheet
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6. Applications, Implementation, and Layout
6.1 Typical Application
6.1.1 BLE/2.4 GHz Radio Coexistence
The BDE-WF3235 device is designed to support BLE/2.4 GHz radio coexistence. Because WLAN is inherently
more tolerant to time-domain disturbances, the coexistence mechanism gives priority to the Bluetooth
®
low
energy entity over the WLAN. Bluetooth
®
low energy operates in the 2.4 GHz band, therefore the coexistence
mechanism does not affect the 5 GHz band. The BDE-WF3235 device can operate normally on the 5 GHz
band, while the Bluetooth
®
low energy works on the 2.4 GHz band without mutual interference.
The following coexistence modes can be configured by the user:
• Off mode or intrinsic mode
– No BLE/2.4 GHz radio coexistence, or no synchronization between WLAN and Bluetooth
®
low energy—
in case Bluetooth
®
low energy exists in this mode, collisions can randomly occur.
• Time Division Multiplexing (TDM, Dual Antenna)
– Dual-band Wi-Fi (see Figure 6-1)
In this mode, the WLAN can operate on either a 2.4 or 5 GHz band and Bluetooth
®
low energy operates
on the 2.4 GHz band.
Figure 6-1 shows the dual antenna implementation of a complete Bluetooth
®
low energy and WLAN coexistence
network with the WLAN operating on either a 2.4- or a 5 GHz band. Note in this implementation a Coex switch
is not required and only a single GPIO from the BLE device to the BDE-WF3235 device is needed.
Figure 6-1. Dual-Antenna Coexistence Mode Block Diagram
RF_ABG RF
CC_COEX_BLE_IN Coex IO
WLAN BLE
BDE-WF3235 Device
Dual-band Antenna BLE Ant