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参数资料
| 型号： | TDA7421N |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封装： | TQFP-64 |
| 文件页数： | 20/47页 |
| 文件大小： | 374K |
| 代理商： | TDA7421N |
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TDA7421N
I2C bus interface
5.4
Acknowledge
Indicates a successful data transfer. The transmitter will release the bus after sending 8 bit
of data. During the 9th clock cycle the receiver will pull the SDA line to LOW level to indicate
it has received the eight bits of data correctly.
5.5
Data transfer
During data transfer the TDA7421N samples the SDA line on the leading edge of the SCL
clock, Therefore, for proper device operation the SDA line must be stable during the SCL
LOW to HIGH transition.
5.6
Device addressing
To start the communication between two devices, the bus master must initiate a start
instruction sequence, followed by an eight bit word corresponding to the address of the
device it is addressing. The most significant 6 bits of the slave address identify the device
type.
The TDA7421N device code is fixed as "110001".
The next significant bit is used either to address the tuner section (1) or the PLL section (0)
of the chip.
Following a START condition the master sends slave address word; the TDA7421N will
"acknowledge" after this first transmission and wait for a second word (the word address
field).This 8 bit address field provides an access to any of the 8 internal addresses. Upon
receipt of the word address the TDA7421N slave device will respond with an "acknowledge".
At this time, all the following words transmits to the TDA7421N will be considered as
data.The internal address will be automatically incremented. After each word receipt the
TDA7421N will answer with an "acknowledge".
The interface protocol comprises:
●
a subaddress byte
●
a sequence of data (N-bytes + acknowledge)
●
a stop condition (P)
●
a start condition (S)
●
a chip address byte
Table 12.
Control register function
REGISTER NAME
FUNCTION
PC
Programmable counter for VCO frequency
RC
Reference counter PLL
IRC
Reference counter IF
IFCM
IF Counter Mode
EW
Frequency error window
IFENA
Enable IF counter
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