SI4844-B20 Datasheet, PDF (19/27 Pages) Silicon Laboratories – BROADCAST ANALOG TUNING DIGITAL DISPLAY AM/FM/SW RADIO RECEIVER

Si4844-B20
0x4001
0x4002
0x4003
Table 12. Si4844-B20 FM Receiver Property Summary (Continued)
RX_HARD_MUTE
RX_BASS_TREBLE
RX_ACTUAL_VOLUME
Mutes the audio output. L and R audio outputs may be
muted independently.
Sets the output bass/treble level.
Reads the actual output volume.
0x0000
0x0004
0x003F
Table 13. Si4844-B20 AM/SW Receiver Command Summary
Cmd
Name
Description
0xE0
ATDD_GET_STATUS Get tune freq, band and etc status of the device.
0xE1
ATDD_POWER_UP
Power up device, band selection and band properties setup
0xE2
ATDD_AUDIO_MODE Audio output mode: get/set audio mode settings.
0x10
GET_REV
Returns the revision information of the device.
0x11
POWER_DOWN
Power down device.
0x12
SET_PROPERTY
Sets the value of a property.
0x13
GET_PROPERTY
Retrieve a property's value.
Note: The Si4844-B has its own power up and get status commands which are 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 14. Si4844-B20 AM/SW Receiver Property Summary
Prop
0x0201
0x0202
0x4000
0x4001
0x4002
0x4003
0x3300
0x3301
0x3302
0x3303
Name
Description
REFCLK_FREQ
Sets frequency of reference clock in Hz. The range is
31330 to 34406 Hz, or 0 to disable the AFC. Default is
32768 Hz.
REFCLK_PRESCALE Sets the prescaler value for RCLK input.
RX_VOLUME
Sets the output volume.
RX_HARD_MUTE
Mutes the audio output. L and R audio outputs may be
muted independently.
RX_BASS_TREBLE
Sets the output bass/treble level.
RX_ACTUAL_VOLUME Read the actual output volume
AM_SOFT_MUTE_RATE Sets the attack and decay rates when entering and leaving
soft mute.
AM_SOFT_MUTE_SLOPE Configures attenuation slope during soft mute in dB attenu-
ation per dB SNR below the soft mute SNR threshold.
AM_SOFT_MUTE_
MAX_ATTENUATION
Sets maximum attenuation during soft mute (dB). Set to 0
to disable soft mute.
AM_SOFT_MUTE_
SNR_THRESHOLD
Sets SNR threshold to engage soft mute.
Default
0x8000
0x0001
0x003F
0x0000
0x0003
0x003F
0x0040
0x0002
0x0010
0x0008
Rev. 1.0
19