AN332 Datasheet, PDF (184/302 Pages) Silicon Laboratories – Si47XX PROGRAMMING GUIDE

AN332
Data Bit
Name
Function
1
7:2
Reserved
Always returns 0.
1
1
AFCRL
AFC Rail Indicator.
This bit will be set if the AFC rails.
1
0
VALID
Valid Channel.
Confirms if the tuned channel is currently valid.
2
7:0
READFREQ_H[7:0]
Read Frequency High Byte.
This byte in combination with READFREQ_L returns frequency being tuned.
3
7:0
READFREQ_L[7:0]
Read Frequency Low Byte.
This byte in combination with READFREQ_H returns frequency being tuned.
4
7:0
RSSI[7:0]
Received Signal Strength Indicator.
This byte will contain the receive signal strength at the tuned frequency.
5
7:0
SNR[7:0]
SNR.
This byte will contain the SNR metric at the tuned frequency.
Command 0x53. WB_RSQ_STATUS
Returns status information about the received signal quality. The commands returns the RSSI, SNR, and frequency
offset. It also indicates whether the frequency is a currently valid frequency as indicated by VALID, and whether the
AFC is railed or not as indicated by AFCRL. This command can be used to check if the received signal is above the
RSSI high threshold as reported by RSSIHINT, or below the RSSI low threshold as reported by RSSILINT. It can
also be used to check if the received signal is above the SNR high threshold as reported by SNRHINT, or below the
SNR low threshold as reported by SNRLINT. The command clears the STCINT interrupt bit when INTACK bit of
ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command
may only be sent when in powerup mode.
Available in: All
Command arguments: One
Response bytes: Seven
Command
Bit
CMD
ARG1
D7
D6
D5
D4
D3
D2
D1
D0
0
1
0
1
0
0
1
1
0
0
0
0
0
0
0
INTACK
Arg Bit
1
0
Name
INTACK
Function
Interrupt Acknowledge
0 = Interrupt status preserved.
1 = Clears RSQINT, SNRHINT, SNRLINT, RSSIHINT, RSSILINT
184
Rev. 1.0