SL869T3-I Product User Guide
1VV0301546 Rev. 3
Page 16 of 68
2021-03-31
4.9.
Internal LNA
The module includes a built-in LNA to improve sensitivity.
4.10.
1PPS
The module provides a 1PPS output signal whenever the receiver has a valid fix (2D or
3D). See section
4.11.
Antenna Enable
The Antenna Enable output can be used to control an external power supply to an active
antenna (or external LNA). It will be high when the receiver is operating, or low when it is
in a low-power (standby) mode.
4.12.
Antenna Sense
The Antenna Sense feature measures the current consumed by the external LNA or
active antenna and reports its status as NORMAL, SHORT, or OPEN in an NMEA
proprietary message.
If the Antenna Sense feature detects a SHORT condition, the Antenna Enable output will
be set low in order to protect the active antenna.
4.13.
Power Management Modes
During normal operation, both Vcc and Vbatt are applied. The module is in a normal
operational state providing navigation data output and responding to command input.
The module provides two types of low-power operation -
•
STANDBY Mode: Vcc and Vbatt are maintained. STANDBY is entered via command.
•
SLEEP Mode: Vcc is not present on the module to enter SLEEP mode. Vbatt must
be maintained. This mode provides the maximum power savings.
In both cases Vbatt must be continuously applied to preserve memory contents.
Mode
Vcc
Vbatt
RFIC
Baseband
TCXO
LNA
Run
ON
ON
ON
ON
ON
ON
Commanded
Standby
ON
ON
Off
Off
Off
Off
Commanded
Active Cyclic
ON
ON
ON
Cycle
Cycle
Cycle
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