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AN332 Datasheet(PDF) 46 Page - Silicon Laboratories

Part No. AN332
Description  Si47XX PROGRAMMING GUIDE
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

AN332 Datasheet(HTML) 46 Page - Silicon Laboratories

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AN332
46
Rev. 1.0
Property 0x2301. TX_ASQ_LEVEL_LOW
This property sets the low audio level threshold relative to 0 dBFS in 1 dB increments, which is used to trigger the
IALL bit. This threshold can be set to detect a silence condition in the input audio allowing the host to take an
appropriate action such as disabling the RF carrier or powering down the chip. The CTS bit (and optional interrupt)
is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The
default is 0x0000 and the range is 0 to –70.
Available in: All
Default: 0x0000
Units: 1 dB
Step: 1 dB
Range: –70 to 0
Property 0x2302. TX_ASQ_DURATION_LOW
This property is used to determine the duration (in 1 ms increments) that the input signal must be below the
TX_ASQ_LEVEL_LOW threshold in order for an IALL condition to be generated. The range is 0 ms to 65535 ms,
and the default is 0 ms. Note that the TX_ASQ_DURATION_LOW and TX_ASQ_DURATION_HIGH counters start
and the TX_ASQ_STATUS command will only return valid data after a call to TX_TUNE_FREQ,
TX_TUNE_POWER, or TX_TUNE_MEASURE. The CTS bit (and optional interrupt) is set when it is safe to send
the next command. This property may only be set or read when in powerup mode.
Available in: All
Default: 0x0000
Units: 1 ms
Step: 1 ms
Range: 0–65535
Bit
D15
D14
D13
D12
D11
D10
D9D8
D7D6
D5D4
D3D2
D1D0
Name
00
00
00
0
0
IALLTH[7:0]
Bit
Name
Function
15:8
Reserved
Always write to 0.
7:0
IALLTH[7:0]
Input Audio Level Low Threshold
.
Threshold which input audio level must be below in order to detect a low audio condition.
Specified in units of dBFS in 1 dB steps (–70 .. 0). Default is 0.
Bit
D15
D14
D13
D12
D11
D10
D9D8
D7D6
D5D4
D3D2
D1D0
Name
IALLDUR[15:0]
Bit
Name
Function
15:0
IALLDUR[15:0]
Input Audio Level Duration Low.
Required duration the input audio level must fall below IALLTH to trigger an IALL inter-
rupt. Specified in 1mS increments (0–65535 ms). Default is 0.


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