TCA9544A
- 1-of-4 Bidirectional Translating Switches
- I2C Bus and SMBus Compatible
- Four Active-Low Interrupt Inputs
- Active-Low Interrupt Output
- Three Address Pins, Allowing up to Eight TCA9544A Devices on the I2C Bus
- Channel Selection Via I2C Bus
- 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 1.65 V to 5.5 V
- 5.5-V Tolerant Inputs
- 0 to 400-kHz Clock Frequency
- Latch-Up Performance Exceeds 100 mA Per JESD 78
- ESD Protection Exceeds JESD 22
- 4000-V Human-Body Model (A114-A)
- 1500-V Charged-Device Model (C101)
The TCA9544A is a 4-channel, bidirectional translating I2C Muliplexer. The master SCL/SDA signal pair is directed to one of the four channels of slave devices, SC0/SD0-SC3/SD3. Four interrupt inputs (INT3–INT0), one for each of the downstream pairs, are provided. One interrupt output (INT) acts as an AND of the four interrupt inputs.
A power-on reset function returns the registers to their default state and initializes the I2C state machine, with all channels deselected.
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 TCA9544A. 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 | TCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer With Interrupt Logic datasheet (Rev. C) | PDF | HTML | 2019/10/29 | ||
| 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 | |||
| 選擇指南 | I2C Infographic Flyer | 2015/12/3 | ||||
| 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
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TCA9548AEVM — TCA9548A I2C 1 對 8 雙向轉換開關評估模組
TCA9548AEVM 旨在評估和演示 TI TCA954xA 系列 I2C 交換機的功能。TCA9548AEVM 可作為獨立評估模組與現有系統連接，或與 MSP430 Lauchpad 搭配使用，後者可作為 I2C 主控端及 TCA9548AEVM 的電源供應器。TCA9548AEVM 也配備多個跨接器，可進行調整以適應 5 種不同的德州儀器 I2C 開關：TCA9543A、TCA9544A、TCA9545A、TCA9546A 和 TCA9548A。通道數較低的裝置可單獨訂購，並放置在 TCA9548AEVM 上以進行評估。
I2C-DESIGNER — I2C 設計工具
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (PW) | 20 | 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。