ZHCSCR9C September 2014 – February 2017 TCA9534A
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Parameter Measurement Information
- 8 Detailed Description
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文档支持
- 13机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
- DW|16
订购信息
8.6.2 Control Register and Command Byte
Following the successful Acknowledgment of the address byte, the bus master sends a command byte that is stored in the control register in the TCA9534A (see Figure 27). Two bits of this command byte state the operation (read or write) and the internal register (input, output, polarity inversion or configuration) that is affected. This register can be written or read through the I2C bus. The command byte is sent only during a write transmission.
Once a command byte has been sent, the register that was addressed continues to be accessed by reads until a new command byte has been sent.
Figure 27. Control Register BitsTable 3 shows the TCA9534A command byte.
Table 3. Command Byte Table
| CONTROL REGISTER BITS | COMMAND BYTE (HEX) | REGISTER | PROTOCOL | POWER-UP DEFAULT | |
|---|---|---|---|---|---|
| B1 | B0 | ||||
| 0 | 0 | 0×00 | Input Port | Read byte | XXXX XXXX |
| 0 | 1 | 0×01 | Output Port | Read/write byte | 1111 1111 |
| 1 | 0 | 0×02 | Polarity Inversion | Read/write byte | 0000 0000 |
| 1 | 1 | 0×03 | Configuration | Read/write byte | 1111 1111 |