AN645 Datasheet, PDF (92/202 Pages) Silicon Laboratories – Si477X PROGRAMMING GUIDE

AN645
Property 0x1301 FM_ACF_SM_THRESHOLD
The FM_ACF_SM_THRESHOLD property sets the softmute interrupt threshold in dB. When softmute attenuation
rises above the level set by this property and the SOFTMUTE_INT interrupt is enabled through the
FM_ACF_INTERRUPT_SOURCE property, the SOFTMUTE_INT interrupt will be asserted. 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 in the
powerup mode.
Default: 31
Units: dB
FM_ACF_SM_THRESHOLD
15 14 13 12 11 10 9 8 7 6 5
4
3
2
1
0
0x000
SMATTN_THRESH[4:0]
0x000
0x1F
Bit
Name
Function
15:5
Reserved
Always write 0.
Softmute interrupt threshold in dB, which triggers the softmute interrupt
4:0
SMATTN_THRESH[4:0]
when the softmute attenuation rises above this level.
Default is 31 dB
Range is 0–31 dB.
92
Rev. 0.3