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参数资料
| 型号： | CP2120-GM |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C/SPI 8B 20QFN |
| 产品培训模块： | CP21xx USB Bridge |
| 标准包装： | 91 |
| 接口： | I²C，SPI |
| 输入/输出数： | 8 |
| 中断输出： | 是 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（4x4） |
| 包装： | 管件 |
| 产品目录页面： | 627 (CN2011-ZH PDF) |
| 其它名称： | 336-1324 |
CP2120
18
Rev. 0.4
6.5.3. Read Buffer
The Read Buffer command retrieves bytes from the CP2120's data buffer. The command begins with the command
byte, 0x06. After the command byte, the SPI Master must transmit a single byte of data, which is ignored by the
CP2120. After receiving the ignored byte of data, the CP2120 transmits data bytes across the MISO pin.
It is recommended that the SPI Master read the RXBUFF Internal Register to determine how many bytes are
stored in the CP2120's buffer before issuing a Read Buffer command. If the SPI Master attempts to retrieve more
bytes than the buffer contains, the CP2120 will signal the error in I2CSTAT. If an SPI Master attempts to retrieve
fewer bytes than are stored in the data buffer, all bytes left in the buffer will be deleted when the Read Buffer
command terminates.
6.5.4. Read After Write
The Read After Write command writes bytes to one I2C slave and then reads bytes from another I2C slave. The
SPI Master calls this command by first sending the command byte, 0x02, then the number of bytes to write (1 to
255) and bytes to read (1 to 255). These bytes are followed by the address of the I2C slave to which the CP2120
will attempt to write bytes, followed by the data bytes to write. The last byte of the command is the I2C slave from
which the CP2120 will attempt to read bytes.
6.5.5. Write After Write
The Write After Write command writes to an I2C slave device and then issues another write to a second I2C slave
device. The command begins with the command byte, 0x08, followed by the number of bytes to write to the first I2C
device and the bytes to write to the second I2C device. The SPI master sends the slave address of the first I2C
device and the data bytes to write to the first I2C slave. The SPI Master then sends the slave address of the second
I2C slave device followed by the data bytes to transmit to that slave device.
6.5.6. Write To Multiple Slaves
The Write to Multiple Slaves command allows an SPI Master to write the same data buffer to multiple I2C slaves.
The command begins with the command byte, 0x09, followed by the size of the data buffer (0 to 255), followed by
the number of slaves (0 to 254). Next, the list of slave addresses is transmitted. Following that, the data buffer to
write to each slave is transmitted. The combined size of the slave address list and the data buffer should not
exceed 255 bytes. The I2CSTAT Internal Register shows the results from the last I2C transaction of the command.
COMMAND
0x06
Don’t Care
Data Byte 0
Data Byte N
...
SPI Master
CP2120
NUMBER OF
WRITE BYTES
0x02
COMMAND
SLAVE
ADDRESS+W
...
NUMBER OF
READ BYTES
DATA WRITE
BYTE 0
DATA WRITE
BYTE N
SLAVE
ADDRESS+R
SPI Master
NUMBER OF
BYTES 1
0x03
COMMAND
SLAVE 1
ADDRESS +W
...
NUMBER OF
BYTES 2
DATA BYTE 1
DATA BYTE N
SLAVE 2
ADDRESS +W
DATA BYTE 1
...
DATA BYTE N
SPI Master
Num Bytes
0x 09
COMMAND
Slave0
...
Num Slaves
Slave N
Data Byte0
...
Data Byte N
SPI Master
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