November 19, 2019 - 11:39am, 464 views
How to use this pin to external antenna switch? My switch is SP2T and what is the initial value of the pin? Low or High? Thank you.
This line (ANT_SWITCH) can be used as a control signal for a possible external 700MHz antenna switch. In case it is unused If unused it should be kept open.
Here are the electrical characteristics:
VOLmax = 0.5V at |IOL| < 5mA
VOHmin = 1.8V at |IOH| < 5mA
VOHmax = 2.3V at |IOH| < 5mA
The ANT_SWITCH line is set to "high" if the module is employing frequencies in the 700 MHz range (i.e., LTE band 17) and "low" for all other frequencies, including the 800/850 MHz frequency bands.
It is triggered by all module internal activities involving a change of the used frequency, even if only temporary (e.g., inter-band scanning using compressed ****).
The maximum delay/deviation between internal usage change of the frequency band, and the pin signal change is 10 microseconds.
Thanks for your reply. Do you have any simple examples of circuit.? I don't know how to design between the antenna switch pin, antenna pad, and antenna. Thank you.
Unfortunately we don't have an example circuit. I think that you need to follow the documentation of your switch. ANT_SWITCH line only changes states from low to high to reflect which frequency is needed. So it ***** to be connected to some control input of the swich.
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