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参数资料
| 型号： | TDA7438D013TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 18/19页 |
| 文件大小： | 215K |
| 代理商： | TDA7438D013TR |
Obsolete
Product(s)
- Obsolete
Product(s)
TDA7438
8/19
4I2C BUS INTERFACE
Data transmission from microprocessor to the TDA7438 and vice versa takes place through the 2 wires
I2C BUS interface, consisting of the two lines SDA and SCL (pull-up resistors to positive supply voltage
must be connected).
4.1 Data Validity
As shown in fig. 12, the data on the SDA line must be stable during the high period of the clock. The HIGH
and LOW state of the data line can only change when the clock signal on the SCL line is LOW.
4.2 Start and Stop Conditions
As shown in fig.13 a start condition is a HIGH to LOW transition of the SDA line while SCL is HIGH. The
stop condition is a LOW to HIGH transition of the SDA line while SCL is HIGH.
4.3 Byte Format
Every byte transferred on the SDA line must contain 8 bits. Each byte must be followed by an acknowledge
bit. The MSB is transferred first.
4.4 Acknowledge
The master (mP) puts a resistive HIGH level on the SDA line during the acknowledge clock pulse (see fig.
14). The peripheral (audio processor) that acknowledges has to pull-down (LOW) the SDA line during this
clock pulse.
The audio processor which has been addressed has to generate an acknowledge after the reception of
each byte, otherwise the SDA line remains at the HIGH level during the ninth clock pulse time. In this case
the master transmitter can generate the STOP information in order to abort the transfer.
4.5 Transmission without Acknowledge
Avoiding to detect the acknowledge of the audio processor, the mP can use a simpler transmission: simply
it waits one clock without checking the slave acknowledging, and sends the new data.
This approach of course is less protected from misworking.
Figure 13. Data Validity on the I2CBUS
Figure 14. Timing Diagram of I2CBUS
SDA
SCL
DATA LINE
STABLE, DATA
VALID
CHANGE
DATA
ALLOWED
D99AU1031
SCL
SDA
START
I2CBUS
STOP
D99AU1032
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PDF描述 |
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| TDA7439D | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7439 | 功能描述:音频 DSP 3-Band Digital Cont RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TDA7439_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Three-band digitally-controlled audio processor |
| TDA7439B | 功能描述:音频 DSP 3-Band Digital Cont RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TDA7439D | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR |
| TDA7439DS | 功能描述:音频 DSP 3-Band Digital Cont RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
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