SL869T3-I Product User Guide
1VV0301546 Rev. 3
Page 45 of 68
2021-03-31
As is the case with all RX lines, the idle state is logic one.
Be careful to tri-state this line if the module is turned off to avoid back-driving.
10.2.
SL869T3-I Reference Design with Antenna Enable and
Antenna Sense
The Antenna Sense pins provide the capability for the module to check the antenna
current draw and report its status as NORMAL, SHORT, or OPEN. This status is reported
at startup and whenever the status changes.
The two comparators (which read the Ant1 and ANT2 pins) are designed with hysteresis
so the rising and falling thresholds are not identical.
This circuit assumes an antenna supply voltage of 3.3 V and a fixed current draw.
Figure 10-2 SL869T3-I Reference Design with Antenna enable & antenna sense
Note/Tip: Pin 7 is RESERVED (no connection) on part numbers
SL869T3I001R001, SL869T3I001T001, SL869T3I001R002 and
SL869T3I001T002.
The above schematic uses the Antenna Sense circuit to control the supply voltage to the
antenna. If its status is NORMAL or OPEN, the supply is enabled. If the status is SHORT,
antenna voltage supply is disabled.
Содержание SL869T3-I
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