Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 60 / 82
Figure 36: Reference Design for NETLIGHT
3.15. RF Transmitting Signal Indication
The M66 provides a RFTXMON pins which will rise when the transmitter is active and fall after the
transmitter activity is completed.
Table 23: Pin Definition of the RFTXMON
There are two different modes for this function:
1) Active during the TX activity
RFTXMON pin is used to indicate the TX burst, when it outputs a high level, 220us later there will be a TX
burst.
Pin Name Pin No. Description
RFTXMON 25 Transmission signal indication