Silicon Laboratories Si475X Series, Руководство по программированию

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AN543
Rev. 0.9 15
Table 3. Command Timing Parameters for Common Commands
Command t
CTS
t
STC
t
INT
POWER_UP 100 ms — 3 µs
POWER_DOWN <1000 µs — 3 µs
FUNC_INFO <200 µs — 3 µs
SET_PROPERTY <200 µs — 3 µs
GET_PROPERTY <200 µs — 3 µs
GET_INT_STATUS <200 µs — 3 µs
AGC_STATUS <200 µs — 3 µs
ANA_AUDIO_PIN_CFG <200 µs — 3 µs
Table 4. Command Timing Parameters for FM Receiver
Command t
CTS
t
STC
t
INT
FM_TUNE_FREQ <200 µs 21 ms 3 µs
FM_TUNE_FREQ (fast tune) <200 µs 5 ms 3 µs
FM_SEEK_START <200 µs See Note below. 3 µs
FM_RSQ_STATUS <200 µs — 3 µs
FM_ACF_STATUS <200 µs — 3 µs
FM_RDS_STATUS <200 µs — 3 µs
FM_RDS_BLOCKCOUNT <200 µs — 3 µs
*Note:
t
STC
is seek time per channel. Total seek time depends on bandwidth, channel spacing, and
number of channels to next valid channel.
Worst case
seek time complete for FM_SEEK_START is:
For Si475x-A30, the seek time will require an additional t
STC
+ t
STC(FAST)
for channel
spacings other than 200 kHz.
Table 5. Command Timing Parameters for AM Receiver
Command t
CTS
t
STC
t
INT
AM_TUNE_FREQ 100 µs 40 ms 3 µs
AM_SEEK_START 100 µs See Note below. 3 µs
AM_RSQ_STATUS 100 µs — 3 µs
AM_ACF_STATUS 100 µs — 3 µs
*Note:
t
STC
is seek time per channel. Total seek time depends on bandwidth, channel spacing, and
number of channels to next valid channel.
FM_SEEK_BAND_TOP FM_SEEK_BAND_BOTTOM
–
FM_SEEK_FREQ_SPACING
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tSTC
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