10.1.2 Antenna Selection
The CC3135MOD device is designed to also support antenna selection and is controlled from Image Creator.
When enabled, there are 3 options possible options:
• ANT 1: When selected, the GPIOs that are defined for antenna selection with set the RF path for antenna 1.
• ANT 2: When selected, the GPIOs that are defined for antenna selection will set the RF path for antenna 2.
• Autoselect: When selected, during a scan and prior to connecting to an AP, CC3135MOD device will
determine the best RF path and select the appropriate antenna
. The result is the saved as port of
the profile.
shows the antenna selection implementation for Wi-Fi, with BLE operating on it's own antenna. Note
in this implementation, only a single GPIO from the BLE device to the CC3135MOD device is required. The
Antenna switch
is controlled by 2 GPIO lines from the CC3135MOD device.
lists which GPIOs can
be used for Antenna Selection.
BLE
CCxxxx
WLAN
CC3135MOD
RF
CC_COEX_BLE_IN
RF_ABG
Coex IO
Antenna Selection
SPDT RF Switch
ANT_SEL_1
ANT_SEL_2
Dual Band Ant. 1
Dual Band Ant. 2
BLE Ant.
Figure 10-2. Coexistence Solution with Wi-Fi Antenna Selection and dedicated BLE antenna
12
When selecting Autoselect via the API, a reset is required in order for the CC3135MOD device to determine the best antenna for use.
13
Uniflash with Image Creator User Guide
for more information.
14
The recommended Antenna switch is the Richwave RTC6608OSP.
SWRS225D – FEBRUARY 2019 – REVISED MAY 2021
44
Copyright © 2021 Texas Instruments Incorporated