Single-Chip Low Power RF Transceiver for Narrowband Systems ...
Single-Chip Low Power RF Transceiver for Narrowband Systems ...
Single-Chip Low Power RF Transceiver for Narrowband Systems ...
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CC1021<br />
VGA3 Register (13h)<br />
REGISTER NAME Default<br />
value<br />
Active Description<br />
VGA3[7:5] VGA_DOWN[2:0] 1 - Decides how much the signal strength must be above<br />
CS_LEVEL+VGA_UP be<strong>for</strong>e VGA gain is decreased.<br />
0: Gain is decreased 4.5 dB above CS_LEVEL+VGA_UP<br />
1: Gain is decreased 6 dB above CS_LEVEL+VGA_UP<br />
…<br />
6: Gain is decreased 13.5 dB above CS_LEVEL+VGA_UP<br />
7: Gain is decreased 15 dB above CS_LEVEL+VGA_UP<br />
VGA3[4:0] VGA_SETTING[4:0] 24 H<br />
See Figure 20 on page 39 <strong>for</strong> an explanation of the<br />
relationship between RSSI, AGC and carrier sense settings.<br />
VGA setting to be used when receive chain is<br />
turned on<br />
This is also the maximum<br />
gain that the AGC is allowed to use.<br />
See Figure 20 on page 39 <strong>for</strong> an explanation of the<br />
relationship between RSSI, AGC and carrier sense settings.<br />
VGA4 Register (14h)<br />
REGISTER NAME Default<br />
value<br />
Active Description<br />
VGA4[7:5] VGA_UP[2:0] 1 - Decides the level where VGA gain is increased if it is not<br />
already at the maximum set by VGA_SETTING.<br />
0: Gain is increased when signal is below CS_LEVEL<br />
1: Gain is increased when signal is below CS_LEVEL+1.5 dB<br />
…<br />
6: Gain is increased when signal is below CS_LEVEL+9 dB<br />
7: Gain is increased when signal below CS_LEVEL+10.5 dB<br />
See Figure 20 on page 39 <strong>for</strong> an explanation of the<br />
relationship between RSSI, AGC and carrier sense settings.<br />
VGA4[4:0] CS_LEVEL[4:0] 24 H Reference level <strong>for</strong> Received Signal Strength Indication<br />
(carrier sense level) and AGC.<br />
See Figure 20 on page 39 <strong>for</strong> an explanation of the<br />
relationship between RSSI, AGC and carrier sense settings.<br />
SWRS045B Page 75 of 89
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