SI4827-A10 Datasheet, PDF (16/25 Pages) Silicon Laboratories – BROADCAST ANALOG TUNING DIGITAL DISPLAY AM/FM/SW RADIO RECEIVER

Si4827-A10
5. Commands and Properties
Table 11. Si4827-A10 FM 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 and 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 Si4827 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 12. Si4827-A10 FM Receiver Property Summary
Prop
Name
Description
0x0201
REFCLK_FREQ
Sets frequency of reference clock in Hz.
The range is 31130 to 34406 Hz, or 0 to disable the AFC.
Default is 32768 Hz.
0x0202 REFCLK_PRESCALE Sets the prescaler value for RCLK input.
0x1100
FM_DEEMPHASIS
Sets deemphasis time constant. Default is 75 μs.
0x1300 FM_SOFT_MUTE_RATE Sets the attack and decay rates when entering and leaving
soft mute.
0x1301 FM_SOFT_MUTE_SLOPE Configures attenuation slope during soft mute in dB attenua-
tion per dB SNR below the soft mute SNR threshold. Default
value is 2.
0x1302
FM_SOFT_MUTE_
MAX_ATTENUATION
Sets maximum attenuation during soft mute (dB). Set to 0 to
disable soft mute. Default is 16 dB.
0x1303
FM_SOFT_MUTE_
SNR_THRESHOLD
Sets SNR threshold to engage soft mute. Default is 4 dB.
0x4000
RX_VOLUME
Sets the output volume.
0x4001
RX_HARD_MUTE
Mutes the audio output. L and R audio outputs may be muted
independently.
0x4002
RX_BASS_TREBLE Sets the output bass/treble level.
0x4003 RX_ACTUAL_VOLUME Read the actual output volume.
Default
0x8000
0x0001
0x0002
0x0040
0x0002
0x0010
0x0004
0x003F
0x0000
0x0004
0x003F
16
Rev. 1.0