PCA9543A
- 1-of-2 Bidirectional Translating Switches
- I2C Bus and SMBus Compatible
- Two Active-Low Interrupt Inputs
- Active-Low Interrupt Output
- Active-Low Reset Input
- Two Address Pins Allowing up to Four PCA9543A Devices on the I2C Bus
- Channel Selection Via I2C Bus, in Any Combination
- Power-up With All Switch Channels Deselected
- Low RON Switches
- Allows Voltage-Level Translation Between 1.8-V, 2.5-V, 3.3-V, and 5-V Buses
- No Glitch on Power-up
- Supports Hot Insertion
- Low Standby Current
- Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
- 5.5-V Tolerant Inputs
- 0 to 400-kHz Clock Frequency
- Latch-Up Performance Exceeds 100-mA Per JESD78
- ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 1000-V Charged-Device Model (C101)
The PCA9543A is a dual bidirectional translating switch controlled by the I2C bus. The SCL/SDA upstream pair fans out to two downstream pairs, or channels. Either individual SCn/SDn channel or both channels can be selected, determined by the contents of the programmable control register. Two interrupt inputs ( INT1– INT0), one for each of the downstream pairs, are provided. One interrupt output ( INT) acts as an AND of the two interrupt inputs.
An active-low reset ( RESET) input allows the PCA9543A to recover from a situation where one of the downstream I2C buses is stuck in a low state. Pulling RESET low resets the I2C state machine and causes both of the channels to be deselected, as does the internal power-on reset function.
The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage, which will be passed by the PCA9543A. This allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5.5-V tolerant.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | PCA9543A 2-Channel I2C Bus Switch With Interrupt Logic and Reset datasheet (Rev. B) | PDF | HTML | 2021/3/11 | ||
| 應用說明 | I2C Solutions for Hot Swap Applications (Rev. A) | 2023/1/31 | ||||
| 應用說明 | I2C Dynamic Addressing | 2019/4/25 | ||||
| 應用說明 | Choosing the Correct I2C Device for New Designs | PDF | HTML | 2016/9/7 | |||
| 應用說明 | Understanding the I2C Bus | PDF | HTML | 2015/6/30 | |||
| 應用說明 | Maximum Clock Frequency of I2C Bus Using Repeaters | 2015/5/15 | ||||
| 應用說明 | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 2015/2/13 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
I2C-DESIGNER — I2C 設計工具
TIDA-060039 — 電感式觸控及磁性轉盤非接觸式使用者介面參考設計
此參考設計採用電感及霍爾效應感測技術以提供人機介面。電感式感測裝置可在無縫表面建立八個不同的觸控按鈕，而霍爾效應感測器則可用於建立磁性轉盤，其可轉動並用作額外按鈕。
使用感應式感測觸控按鈕提供完整的解決方案，該解決方案使用按壓之力來決定按鈕的按壓動作。這使觸控按鈕可以與手套一起使用，同時忽略環境因素，如按鈕表面髒污或損壞。霍爾效應感測器轉盤可產生非接觸式旋轉，與電位計或旋轉編碼器等傳統接觸式實作方式相比，其磨損與撕裂程度有所改善。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOIC (D) | 14 | Ultra Librarian |
| TSSOP (PW) | 14 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。