Adjustments; Led Indicators - Texas Instruments TRF6900 User Manual

Connectors and Test Points
-
-
-
-
-
-
-
-
2.7.3

Adjustments

Resistor R44 is varied to adjust the VCC1 voltage applied to IC1 (TRF6900).
2.7.4

LED Indicators

-
-
-
RSSI TP
The RSSI test point is used to monitor the RSSI level from IC1–33
RSSI_OUT.
RXDATA TP
The RXDATA test point is used to monitor the RXDATA from IC1–28
DATA_OUT. This is the demodulated signal.
MODE TP
The MODE test point is used to monitor the MODE line.
STDBY TP
The STDBY test point is used to monitor the STDBY line.
CLOCK TP
The CLOCK test point is used to monitor the CLOCK signal from the PC.
DATA TP
The DATA test point is used to monitor the DATA signal from the PC.
STROBE TP
The STROBE test point is used to monitor the STROBE signal from
the PC.
TXDATA TP
The TXDATA test point is used to monitor the transmitted data. Transmit
data from an external source can also be applied at this point.
VCC LED
If JP8 is installed, the VCC LED is illuminated when voltage is applied to
IC1.
LDET LED
The LDET LED is illuminated when the lock detect line IC1–11 (TRF6900)
is high, indicating that the PLL circuit is locked.
ENABLE LED
The ENABLE LED is illuminated when the STDBY line from computer is
in the high state.