STV-674 データシートの表示（PDF） - STMicroelectronics
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STV-674 Datasheet PDF : 35 Pages
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STV0674 Functional Description
STV0674
2.5.3
EEPROM interface
The STV0674 supports up to 512Kbit EEPROM to hold application specific firmware code. Also, in
the case of a tethered only web cam, lower density EEPROMs (down to 1Kbit) can be used to store
information regarding custom USB Product ID, Vendor ID and power consumption.
2.6 Audio record
The audio record block consists of a 16bit delta-sigma ADC using sampling frequencies of 8 kHz,
11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz and 48 kHz, with either differential or single
ended inputs. The sampled output can be 8 or 16 bit.
2.7 Audio playback
Audio playback is achieved by an internal Pulse Width Modulator with sample rates of 8kHz,
11.025kHz, 16kHz, 22.05kHz, 32kHz or 44.1kHz, connected to either an external amplifier chip and
loudspeaker/ headphone socket or to a simple piezo buzzer.
2.8 USB PC interface
The STV0674 includes a USB version 1.1 compliant Universal Serial Bus interface which requires
the minimum of additional hardware. The interface key features are listed here below.
q Compliant with USB protocol revision 1.1
q USB audio class compliant
q USB protocol handling
q USB device state handling
q Clock and data recovery from USB
q Bit stripping and bit stuffing functions
q CRC5 checking, CRC16 generation and checking
q Serial to parallel conversion
q Twin bulk end points (in/out)
USB drivers are supplied by ST. For USB timing information, please refer to the USB specification
version 1.1.
2.9 Power requirements
STV0674 requires a 3V3 supply for I/O and a 1V8 supply for the core.
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