PCA9548A

現行

具重設和電壓轉換的 8 通道 2.3 至 5.5-V I2C/SMBus 開關

立即訂購

產品規格表

document-pdfAcrobat PCA9548A Low Voltage 8-Channel I2C Switch with Reset datasheet (Rev. G) (英文) PDF | HTML

現在提供此產品的更新版本

open-in-new

比較替代產品

具備升級功能，可直接投入使用替代所比較的裝置。

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 Performance enhancements for power-on reset and lower voltage operation.

PCA9548A

現行

產品規格表

立即訂購

產品詳細資料

Addresses

8

Features

Reset pin

Rating

Catalog

Frequency (max) (MHz)

0.4

Operating temperature range (°C)

-40 to 85

Number of channels

8

Addresses

8

Features

Reset pin

Rating

Catalog

Frequency (max) (MHz)

0.4

Operating temperature range (°C)

-40 to 85

Number of channels

8

SOIC (DW)

24

159.65 mm² (15.5 mm × 10.3 mm)

SSOP (DB)

24

63.96 mm² (8.2 mm × 7.8 mm)

TVSOP (DGV)

24

32 mm² (5 mm × 6.4 mm)

TSSOP (PW)

24

49.92 mm² (7.8 mm × 6.4 mm)

VQFN (RGE)

24

16 mm² (4 mm × 4 mm)

1-of-8 Bidirectional Translating Switches
I²C Bus and SMBus Compatible
Active-Low Reset Input
Three Hardware Address Pins for Use of up to Eight PCA9548A Devices on the I²C Bus
Channel Selection Via I²C Bus
Power-Up with All Switch Channels Deselected
Low R_ON 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-V Tolerant Inputs
0-kHz to 400-kHz Clock Frequency
Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)

1-of-8 Bidirectional Translating Switches
I²C Bus and SMBus Compatible
Active-Low Reset Input
Three Hardware Address Pins for Use of up to Eight PCA9548A Devices on the I²C Bus
Channel Selection Via I²C Bus
Power-Up with All Switch Channels Deselected
Low R_ON 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-V Tolerant Inputs
0-kHz to 400-kHz Clock Frequency
Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)

The PCA9548A 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 SCx/SDx 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 slave 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 master can reset the PCA9548A 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 should once of the downstream I²C buses get stuck in a low state.

The pass gates of the switches are constructed so that the V_CC pin can be used to limit the maximum high voltage, which is passed by the PCA9548A. 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-V tolerant.

The PCA9548A 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 SCx/SDx 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 slave 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 master can reset the PCA9548A 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 should once of the downstream I²C buses get stuck in a low state.

The pass gates of the switches are constructed so that the V_CC pin can be used to limit the maximum high voltage, which is passed by the PCA9548A. 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-V tolerant.

filter

尋找其它 I2C & I3C 交換器與多工器

下載觀看有字幕稿的影片影片

技術文件

找不到結果。請清除您的搜尋條件，然後再試一次。

檢視所有 7

重要文件	類型	標題	格式選項	日期
*	資料表	PCA9548A Low Voltage 8-Channel I2C Switch with Reset datasheet (Rev. G)	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)。

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：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。