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TCA9548A

現行

具重設和電壓轉換的 8 通道 1.65 至 5.5-V I2C/SMBus 開關

產品詳細資料

Addresses 8 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 1.65 Features Reset pin Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85 Number of channels 8
Addresses 8 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 1.65 Features Reset pin Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85 Number of channels 8
TSSOP (PW) 24 49.92 mm² 7.8 x 6.4 VQFN (RGE) 24 16 mm² 4 x 4 VSSOP (DGS) 24 29.89 mm² 6.1 x 4.9
  • 1-to-8 Bidirectional translating switches
  • I2C Bus and SMBus compatible
  • Active-low reset input
  • Three address pins, allowing up to eight TCA9548A devices on the I2C bus
  • Channel selection through an I2C Bus, in any combination
  • Power up with all switch channels deselected
  • Low RON switches
  • Allows voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses
  • No glitch on power up
  • Supports hot insertion
  • Low standby current
  • Operating power-supply voltage range of 1.65V to 5.5V
  • 5-V Tolerant inputs
  • 0 to 400kHz Clock frequency
  • Latch-up performance exceeds 100mA Per JESD 78, class II
  • ESD Protection exceeds JESD 22
    • ±2000V Human-body model (A114-A)
    • 200V Machine model (A115-A)
    • ±1000V Charged-device model (C101)
  • 1-to-8 Bidirectional translating switches
  • I2C Bus and SMBus compatible
  • Active-low reset input
  • Three address pins, allowing up to eight TCA9548A devices on the I2C bus
  • Channel selection through an I2C Bus, in any combination
  • Power up with all switch channels deselected
  • Low RON switches
  • Allows voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses
  • No glitch on power up
  • Supports hot insertion
  • Low standby current
  • Operating power-supply voltage range of 1.65V to 5.5V
  • 5-V Tolerant inputs
  • 0 to 400kHz Clock frequency
  • Latch-up performance exceeds 100mA Per JESD 78, class II
  • ESD Protection exceeds JESD 22
    • ±2000V Human-body model (A114-A)
    • 200V Machine model (A115-A)
    • ±1000V Charged-device model (C101)

The TCA9548A device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C target address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.

The system controller can reset the TCA9548A in the event of a time-out, or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery if one of the downstream I2C buses get stuck in a low state.

The pass gates of the switches are constructed so that the VCC pin can be used to limit the maximum high voltage, which is passed by the TCA9548A. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 1.8V, 2.5V or 3.3V parts can communicate with 5V parts, without any additional protection. External pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5V tolerant.

The TCA9548A device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C target address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.

The system controller can reset the TCA9548A in the event of a time-out, or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery if one of the downstream I2C buses get stuck in a low state.

The pass gates of the switches are constructed so that the VCC pin can be used to limit the maximum high voltage, which is passed by the TCA9548A. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 1.8V, 2.5V or 3.3V parts can communicate with 5V parts, without any additional protection. External pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5V tolerant.

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技術文件

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檢視所有 11
類型 標題 日期
* Data sheet TCA9548A Low-Voltage 8-Channel I2 C Switch with Reset datasheet (Rev. H) PDF | HTML 2024年 9月 30日
Application note PassFET Hang Time with TCA39306 I2C, I3C Level Translator PDF | HTML 2024年 9月 23日
Application brief Best Practices: I2C Devices on an I3C Shared Bus PDF | HTML 2023年 3月 30日
Application note I2C Solutions for Hot Swap Applications (Rev. A) 2023年 1月 31日
Application note I2C Dynamic Addressing 2019年 4月 25日
Application note Choosing the Correct I2C Device for New Designs PDF | HTML 2016年 9月 7日
Selection guide I2C Infographic Flyer 2015年 12月 3日
Technical article How to simplify I2C tree when connecting multiple slaves to an I2C master PDF | HTML 2015年 10月 15日
Application note Understanding the I2C Bus PDF | HTML 2015年 6月 30日
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 2015年 5月 15日
Application note I2C Bus Pull-Up Resistor Calculation PDF | HTML 2015年 2月 13日

設計與開發

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開發板

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:TCA9543ATCA9544ATCA9545ATCA9546ATCA9548A。通道數較低的裝置可單獨訂購,並放置在 TCA9548AEVM 上以進行評估。

使用指南: PDF
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模擬型號

TCA9548A IBIS Model (Rev. A)

SCPM023A.ZIP (41 KB) - IBIS Model
設計工具

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模擬工具

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PSpice® for TI 是有助於評估類比電路功能的設計和模擬環境。這款全功能設計和模擬套件使用 Cadence® 的類比分析引擎。PSpice for TI 包括業界最大的模型庫之一,涵蓋我們的類比和電源產品組合,以及特定類比行為模型,且使用無需支付費用。

PSpice for TI 設計和模擬環境可讓您使用其內建函式庫來模擬複雜的混合訊號設計。在進行佈局和製造之前,建立完整的終端設備設計和解決方案原型,進而縮短上市時間並降低開發成本。 

在 PSpice for TI 設計與模擬工具中,您可以搜尋 TI (...)
模擬工具

TINA-TI — 基於 SPICE 的類比模擬程式

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
使用指南: PDF
參考設計

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TPA3244 Dolby Atmos® 條型音箱參考設計結合了 Ultra-HD 音訊與高動態範圍,可透過小型系統創造充斥空間的音訊體驗。此設計運用 TI 的高性能 TPA3244 放大器,具有處理功能的 PCM5252 高性能 DAC,以及用於解碼和呈現 Dolby Atmos® 的整合式 SoC。條型音箱參考電路板使用 TI 的整合式音訊 DSP,提供 10 個 DAC + 放大器通道,以進行獨立通道處理,其中包括數位主動交越、DRC 和雙二階,以支援 5.1.2 條型音箱輸出配置。此設計使用 66AK2G 音訊 SoC 進行 Dolby Atmos® 解碼和轉譯。
Design guide: PDF
電路圖: PDF
參考設計

TIDA-01373 — EEPROM 編程工具參考設計

TIDA-01373 是針對 DRV10983、DRV10975、DRV10983-Q1 及 DRV10987 整合式 BLDC 馬達驅動器的可擴充程式設計工具參考硬體與軟體範例。這些裝置具備可設定的 EEPROM 暫存器,需設定為馬達特定參數。此參考設計詳述如何一次設定最多 8 台馬達驅動器裝置的 EEPROM 馬達參數值。
Design guide: PDF
電路圖: PDF
封裝 針腳 CAD 符號、佔位空間與 3D 模型
TSSOP (PW) 24 Ultra Librarian
VQFN (RGE) 24 Ultra Librarian
VSSOP (DGS) 24 Ultra Librarian

訂購與品質

內含資訊:
  • RoHS
  • REACH
  • 產品標記
  • 鉛塗層/球物料
  • MSL 等級/回焊峰值
  • MTBF/FIT 估算值
  • 材料內容
  • 認證摘要
  • 進行中持續性的可靠性監測
內含資訊:
  • 晶圓廠位置
  • 組裝地點

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