Silicon Laboratories Si4704 Series Programming Manual page 201

Table 46. Programming Example for the FM/RDS Transmitter
Action
CMD
ARG1
ARG2
STATUS
CMD
ARG1
ARG2 (PROP)
ARG3 (PROP)
ARG4 (PROPD)
ARG5 (PROPD)
STATUS
CMD
ARG1
ARG2 (PROP)
ARG3 (PROP)
ARG4 (PROPD)
ARG5 (PROPD)
STATUS
CMD
ARG1
ARG2
STATUS
CMD
ARG1
ARG2 (PROP)
ARG3 (PROP)
ARG4 (PROPD)
ARG5 (PROPD)
STATUS
Data
Powerup in Digital Mode
0x01 POWER_UP (See Table 28 for patching procedure)
0xC2 Set to FM Transmit. Enable interrupts.
0x0F Set to Digital Audio Input
→0x80 Reply Status. Clear-to-send high.
Action: Ensure that DCLK and DFS are already supplied
0x12 SET_PROPERTY
0x00
0x01 DIGITAL_INPUT_SAMPLE_RATE
0x03
0xBB Sample rate = 48000Hz = 0xBB80
0x80
→0x80 Reply Status. Clear-to-send high.
0x12 SET_PROPERTY
0x00
0x01 DIGITAL_INPUT_FORMAT
0x01
0x00 Mode: I2S, stereo, 16bit, sample on rising edge of DCLK.
0x00
→0x80 Reply Status. Clear-to-send high.
Action: Go to Configuration (bypass "Powerup in analog mode" section).
The rest of the programming is the same as analog.
Powerup in analog mode
0x01 POWER_UP (See Table 28 for patching procedure)
0xC2 Set to FM Transmit. Enable interrupts.
0x50 Set to Analog Line Input
→0x80 Reply Status. Clear-to-send high.
0x12 SET_PROPERTY
0x00
0x21 TX_LINE_INPUT_LEVEL
0x04
0x21 Input Range = 419mV
0x5E Max peak input level = 350mV
→0x80 Reply Status. Clear-to-send high
Confidential Rev. 0.2
Description
, 74kΩ
PK
= 0x15E
PK
AN332
201