7

Antenna voltage supply (VCC_RF, pin 14)

Teseo-LIV4F has built-in LNA and SAW. It is recommended to use an active antenna with gain less than 36 dB

and the noise figure less than 1.5 dB.

Teseo-LIV4F has built-in short circuit detection and open circuit detection function, which can detect the status of

normal connection, and send out antenna status prompt message in NMEA data:

•

Short circuit protection: once an overcurrent is detected at the VCC_RF pin (pin 14), the module will cut off

this power supply automatically to prevent permanent damages.

•

Open circuit detection: Teseo-LIV4F can detect an open circuit in the antenna.

Table 3 reports the antenna status threshold.

Table 3. Antenna Status current threshold

Antenna Status

Status Output

VCC_RF on current range

Open circuit

OPEN

0 < VCC_RF ≤ 1 mA

Regular circuit or open circuit

OK or OPEN

1 mA < VCC_RF ≤ 2 mA

Regular circuit

OK

2 mA < VCC_RF ≤ 40 mA ± 5 mA

Short circuit

SHORT

40 mA ±5 mA < VCC_RF ≤ 55 mA

Teseo-LIV4F

Antenna voltage supply (VCC_RF, pin 14)

DS13957 - Rev 3

page 10/30