SLOS743M August 2011 – March 2020 TRF7970A
PRODUCTION DATA.
The level of the RF carrier at RF_IN1 and RF_IN2 inputs is measured. Operating range between 300 mVP and 2.1 VP (step size is 300 mV). The two values are displayed in the RSSI Levels and Oscillator Status register (0x0F). The command is intended for diagnostic purposes to set correct RF_IN levels. Optimum RFIN input level is approximately 1.6 VP or code 5 to 6. The nominal relationship between the RF peak level and RSSI code is shown in Table 6-22 and in Section 6.5.1.1.
NOTE
If the command is executed immediately after power-up and before any communication with a tag is performed, the command must be preceded by Enable RX command. The Check RF commands require full operation, so the receiver must be activated by Enable RX or by a normal Tag communication for the Check RF command to work properly.
RF_IN1 [mVPP] | 300 | 600 | 900 | 1200 | 1500 | 1800 | 2100 |
Decimal Code | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
Binary Code | 001 | 010 | 011 | 001 | 101 | 011 | 111 |