FAQ_ How to implement RX-TX switching control

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FAQ_ How to implement RX-TX switching control [Copy link]

 

Author: Joshua Zhu, ST engineer

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2019-10-12 16:48 上传

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Problem: Some customers want to develop products using BlueNCG-132 and want to add an external PA & LNA to extend the range of the RF system.
1). Add an external power amplifier (PA) to increase the output power;

2). Add an external low noise amplifier (LNA) to improve sensitivity.

Customers want to know how to achieve the above RX/TX switch control?

answer:

1). From LNA/PA (RFX2401C), we have to implement the following controls:

a. TXEN CMOS input controls TX enable

b. RXEN CMOS input controls RX enable

2). You can change the following line of code (in the file system_bluenrg1.c):
#define COLD_START_CONFIGURATION \
{\
NUMBER_CONFIG_BYTE, ATB0_ANA_ENG_REG, 0x1A, \

NUMBER_CONFIG_BYTE, ATB1_ANA_ENG_REG, 0x34, \

....
Note:
1). When there is TX/RX signal, it will output high level on TEST1pin;

2). When there is a TX signal, it will output a high level on TEST0pin;
3). Reference mantis: 2609,3122.

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