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Si4840/44-A10
5. Commands and Properties
Table 11. Si4840/44-A10 FM Receiver Command Summary
Cmd
0xE0
0xE1
0xE2
0x10
0x11
0x12
0x13
Name
ATDD_GET_STATUS
ATDD_POWER_UP
ATDD_AUDIO_MODE
GET_REV
POWER_DOWN
SET_PROPERTY
GET_PROPERTY
Description
Get tune freq, band and etc status of the device
Power up device, band selection and band properties setup
Audio output mode: get/set audio mode and settings
Returns the revision information of the device.
Power down device.
Sets the value of a property.
Retrieve a property's value.
Note: The si4840/44 has its own power up and get status commands which is different from previous si47xx tuner parts. To
differentiate, we use “ATDD_POWER_UP” and ATDD_GET_STATUS to denote the ATDD specific commands instead
of the general si47xx “POWER_UP” and “STATUS” commands
Table 12. Si4840/44-A10 FM Receiver Property Summary
Prop
0x1100
0x1300
Name
FM_DEEMPHASIS
FM_SOFT_MUTE_RATE
Description
Sets deemphasis time constant. Default is 75 μ s.
Sets the attack and decay rates when entering and leaving
Default
0x0002
0x0040
soft mute.
0x1301
FM_SOFT_MUTE_SLOPE
Configures attenuation slope during soft mute in dB attenua-
0x0002
tion per dB SNR below the soft mute SNR threshold. Default
value is 2.
0x1302
0x1303
FM_SOFT_MUTE_
MAX_ATTENUATION
FM_SOFT_MUTE_
Sets maximum attenuation during soft mute (dB). Set to 0 to
disable soft mute. Default is 16 dB.
Sets SNR threshold to engage soft mute. Default is 4 dB.
0x0010
0x0004
SNR_THRESHOLD
0x1207
0x1800
0x1801
FM_STEREO_IND
_BLEND_THRESHOLD
FM_BLEND_RSSI_
STEREO_THRESHOLD
FM_BLEND_RSSI_
MONO_THRESHOLD
Sets the blend threshold for stereo indicator. Default value is
band dependent (either 0x9F or 0xB2)
Sets RSSI threshold for stereo blend. (Full stereo above
threshold, blend below threshold.) To force stereo, set this to
0. To force mono, set this to 127. Default value is 49 dB μ V.
Sets RSSI threshold for mono blend (Full mono below
threshold, blend above threshold). To force stereo, set this to
0. To force mono, set this to 127. Default value is band
0x9F
0xB2
0x0031
0x0008
0x0007
dependent (either 8 or 7).
0x4000
0x4001
RX_VOLUME
RX_HARD_MUTE
Sets the output volume.
Mutes the audio output. L and R audio outputs may be
0x003F
0x0000
muted independently.
0x4002
0x4003
RX_BASS_TREBLE
RX_ACTUAL_VOLUME
Sets the output bass/treble level
Read the actual output volume
Rev.1.0
0x0004
0x003F
17
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