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STW5094 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. STW5094
Description  18 BIT 8kHz TO 48kHz LOW POWER STEREO AUDIO DAC WITH INTEGRATED POWER AMPLIFIERS AND VOICE CODEC
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STW5094 Datasheet(HTML) 6 Page - STMicroelectronics

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FUNCTIONAL DESCRIPTION
I DEVICE MODES
STw5094 can work in 4 different modes, selected by bits MD in Control Register 18 (CR18). Depending on the
mode different data interfaces, clock inputs, and internal blocks are selected. A built-in power consumption
management function keeps in power down the blocks that are not needed by the selected operating mode. In
all the modes the Output Drivers can be activated in all the combinations allowed by bits OS in CR6 (in case of
stereo input and LSP
⁄ N driver selected the Left channel is sent to this driver, while in case of voice input and
HPL + HPR drivers selected the same signal is sent to both drivers).
I.1 Audio Mode:
In Audio mode the path from the I2S I
⁄ F to the output drivers is active to allow the Stereo Audio DAC function.
The I2S I
⁄ F is active while the PCM I ⁄ F is inactive.
The master clock of the device is OCK. The OCK frequency must be 256 times the sampling frequency for the
MPEG1 and MPEG2 sampling frequencies and 512 times for the MPEG2.5 sampling frequencies.
The sampling frequency (LRCK frequency) can be selected with bits LAY and AFS in REG6.
Since the OCK clock is used directly in all the Audio blocks, its jitter and spectral properties must be adequate
to the desired Audio quality.
The Tone
⁄ Ring ⁄ DTMF generator can be activated if needed. The FM preamplifiers are in power down.
I.2 Voice Mode:
In Voice mode the TX path from microphone or line input to DX and the RX path from DR to the output drivers
are active to allow the PCM CODEC function. The PCM I
⁄ F is active while the I2S I ⁄ F is inactive.
The master clock of the device is MCLK, the frequency of the clock can be selected with bits F in CR0.
The FM preamplifiers are in power down.
I.3 Tone Only Mode:
In Tone Only mode the path from the Tone generator to the output Drivers and to the Buzzer is active to allow
Tones or Ringer listening only. Both I2S I
⁄ F and PCM I ⁄ F are inactive, as all the Audio and Voice converters
functions.
The master clock of the device can be selected to be AUXCLK, MCLK or OCK (bits CFM in CR18).
The Tone
⁄ Ring ⁄ DTMF generator can be activated if needed. The FM preamplifiers are in power down.
I.4 FM Mode:
In FM mode the path from FML and FMR analog inputs to the output Drivers is active to allow FM Stereo Radio
listening. Both I2S I
⁄ F and PCM I ⁄ F are inactive, as all the Audio and Voice converters functions.
The master clock of the device can be selected to be AUXCLK, MCLK or OCK (bits CFM in CR18).
The Tone
⁄ Ring ⁄ DTMF generator is in power down.
II DEVICE OPERATION
II.1 Power on initialization and Software Reset:
When power is first applied, power on reset circuitry initializes STw5094 and puts it into the power down state.
All the Registers are initialized as indicated in the Control Register description section. All the functions are
disabled.
The registers can be initialized also writing bit SRS (software reset) in CR18.


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