Texas Instruments TRF4900, User Manual, Page: 34 / 45

PLL/Modulation Options Screen
3-7
Software User’s Guide
Figure 3−2. Chip Layout Screen
Enable or Standby.
IC is Disabled in
Standby Mode.
Press to Select
PLL/Modulation
Options Screen
Press to Start
FSK Test
Press to Program the TRF4900
Turn TX Data On or Off
Mode Select 0 or 1
Clicking Here Sets
Power Amp
Attenuation (0 dB,
10 dB, 20 dB) or
Turn the Power
Amp Off
Press to Turn PLL and VCO On or Off
-
The Mode Options (e.g., the Power Amp, PLL, etc.) may be controlled
from the chip layout screen, as well as from the main program screen.
Changes made in either the main program screen or the chip layout
screen simultaneously update both screens. The user can also control the
chip enable, TXData, and mode control lines from the chip layout screen.
-
The user can select FSK Modulation. The FSK Test button, located on the
chip layout screen, will allow the user to transmit data using the TRF4900.
Options for use with the FSK Test button are the pulse repetition frequency
(PRF), which is defaulted to 100 Hz, and the Run Time (Min), which can
be set in minutes. For example, if you want the test to run for five minutes,
set Run Time (Min) to 5.
-
The PLL/Modulation Options button brings up the PLL/Modulation
Options screen as shown in Figure 3−3. This button is activated only when
the PLL is on.
3.4 PLL/Modulation Options Screen
The PLL/Modulation Options screen is accessed by pressing the
PLL/Modulation Option button, located on the chip layout screen, and is
displayed as shown in Figure 3−3.