SI4720-B20-GMR Datasheet, PDF (38/48 Pages) Silicon Laboratories – BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS

Si4720/21-B20
Table 21. Si472x Property Summary (Continued)
Prop
Name
Description
Default
Sets the release time for audio dynamic range control.
0x2203 TX_ACOMP_RELEASE_TIME
Default is 4 (1000 ms).
0x2204
TX_ACOMP_GAIN
Sets the gain for audio dynamic range control.
Default is 15 dB.
0x2205 TX_LIMITER_RELEASE_TIME Sets the limiter release time. Default is 102 (5.01 ms)
0x2300
TX_ASQ_INTERRUPT_SOURCE
Configures measurements related to signal quality met-
rics. Default is none selected.
0x2301
TX_ASQ_LEVEL_LOW
Configures low audio input level detection threshold.
This threshold can be used to detect silence on the
incoming audio.
0x2302
TX_ASQ_DURATION_LOW
Configures the duration which the input audio level must
be below the low threshold in order to detect a low audio
condition.
0x2303
TX_ASQ_LEVEL_HIGH
Configures high audio input level detection threshold.
This threshold can be used to detect activity on the
incoming audio.
0x2304
TX_ASQ_DURATION_HIGH
Configures the duration which the input audio level must
be above the high threshold in order to detect a high
audio condition.
0x2C00
TX_RDS_INTERRUPT_SOURCE
Si4721 Only. Configure RDS interrupt sources. Default
is none selected.
0x2C01
TX_RDS_PI
Si4721 Only. Sets transmit RDS program identifier.
0x2C02
TX_RDS_PS_MIX
Si4721 Only. Configures mix of RDS PS Group with
RDS Group Buffer.
0x2C03
TX_RDS_PS_MISC
Si4721 Only. Miscellaneous bits to transmit along with
RDS_PS Groups.
Si4721 Only. Number of times to repeat transmission of
0x2C04 TX_RDS_PS_REPEAT_COUNT a PS message before transmitting the next PS mes-
sage.
0x2C05 TX_RDS_PS_MESSAGE_COUNT Si4721 Only. Number of PS messages in use.
0x2C06
TX_RDS_PS_AF
Si4721 Only. RDS Program Service Alternate Fre-
quency. This provides the ability to inform the receiver of
a single alternate frequency using AF Method A coding
and is transmitted along with the RDS_PS Groups.
0x2C07
TX_RDS_FIFO_SIZE
Si4721 Only. Number of blocks reserved for the FIFO.
Note that the value written must be one larger than the
desired FIFO size.
0x0004
0x000F
0x0066
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x40A7
0x0003
0x1008
0x0003
0x0001
0xE0E0
0x0000
Receive Properties
0x0001
0x0102
GPO_IEN
DIGITAL_OUTPUT_
FORMAT
Enables interrupt sources.
Configure digital audio outputs (Si4721 only)
0x0000
0x0000
0x0104
DIGITAL_OUTPUT_
SAMPLE_RATE
Configure digital audio output sample rate (Si4721 only) 0x0000
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Rev. 1.0