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参数资料
| 型号： | TDA7439B |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDIP28 |
| 封装： | DIP-28 |
| 文件页数： | 18/19页 |
| 文件大小： | 169K |
| 代理商： | TDA7439B |
I
2C BUS INTERFACE
Data transmission from microprocessor to the
TDA7439 and vice versa takes place through the
2 wires I
2C BUS interface, consisting of the two
lines SDA and SCL (pull-up resistors to positive
supply voltage must be connected).
Data Validity
As shown in fig. 9, 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.
Start and Stop Conditions
As shown in fig.10 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 tran-
sition of the SDA line while SCL is HIGH.
Byte Format
Every byte transferred on the SDA line must con-
tain 8 bits. Each byte must be followed by an ac-
knowledge bit. The MSB is transferred first.
Acknowledge
The master (
P) puts a resistive HIGH level on the
SDA line during the acknowledge clock pulse (see
fig. 11). The peripheral (audio processor) that ac-
knowledges 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 recep-
tion 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 gen-
erate the STOP information in order to abort the
transfer.
Transmission without Acknowledge
Avoiding to detect the acknowledge of the audio
processor, the
P 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 9: Data Validity on the I
2CBUS
Figure 10: Timing Diagram of I
2CBUS
Figure 11: Acknowledge on the I
2CBUS
TDA7439
8/19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| TDA7439DS_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Three-band digitally-controlled audio processor |
| TDA7439DS13TR | 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 |
| TDA7440 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TONE CONTROL DIGITALLY CONTROLLED AUDIO PROCESSOR |
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