Sierra Wireless AIRPRIME WISMO218 - Manual (Page 73)

WA_DEV_W218_PTS_002 Rev 006 April 29, 2010 73
Product Technical Specification &
Customer Design Guidelines Interfaces
3.17.2. Pin Description
Table 35: TX_CTRL Signal Pin Descriptions
Signal
Pin
Number
I/O I/O Type Reset State Description
TX_CTRL 18 O 2V8 1 TX Burst indication
3.17.3. Application
The TX burst indication signal, TX_CTRL, can be used to drive a LED through a transistor. It will then
be a good visual indicator for any TX activities.
Figure 37. Example of TX Status Implementation
The value of R607 can be harmonized depending on the LED (D605) characteristics.