Quectel AF20 User Manual

Wi-Fi&Bluetooth Module Series
AF20_Hardware_Design
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Table 12: Pin Definition of 32KHZ_IN
Pin Name
Pin No.
I/O
Description
Comment
32KHZ_IN
19
DI
Used as a timer in low power modes.
External 32.768 kHz clock input is
required in sleep mode.
1.8 V power domain.
If unused, keep this pin
open.
3.9. RF Antenna Interface
3.9.1. Pin Definition of the RF Antenna Interface
Table 13: Pin Definition of the RF Antenna Interface
Pin Name
Pin No.
I/O
Description
Comment
RF_ANT
30
AIO
Wi-Fi/Bluetooth antenna interface
50 Ω impedance
3.9.2. Operating Frequency
Table 14: Operating Frequency of the Module
Feature
Frequency
Unit
2.4 GHz Wi-Fi
2.412–2.472
GHz
5 GHz Wi-Fi
5.180–5.825
GHz
Bluetooth
2.402–2.480
GHz
3.9.3. Reference Design
AF20 module provides an RF antenna interface for antenna connection. A reference circuit design for RF
antenna interface is shown below. It is recommended to reserve a π-type matching circuit for better RF
performance, and the π-type matching components (C1, C2, R1) should be placed as close to the
antenna as possible. The capacitors are not mounted by default.

Quectel AF20 Specifications

General

Brand	Quectel
Model	AF20
Category	GSM/GPRS Modules
Language	English