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PCA9544A

AKTIV

4-Kanal, 2,3- bis 5,5-V I2C/SMBus-Multiplexer mit Interrupt und Spannungsumsetzung

Eine neuere Version dieses Produkts ist verfügbar

Drop-In-Ersatz mit gegenüber dem verglichenen Baustein verbesserter Funktionalität.
TCA9544A AKTIV 4-Kanal, 1,65- bis 5,5-V I2C/SMBus-Multiplexer mit Interrupt und Spannungsumsetzung Performance enhancements for power-on reset and lower voltage operation.

Produktdetails

Addresses 8 Features Interrupt pin Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85 Number of channels 4
Addresses 8 Features Interrupt pin Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85 Number of channels 4
TSSOP (PW) 20 41.6 mm² (6.5 mm × 6.4 mm) TVSOP (DGV) 20 32 mm² (5 mm × 6.4 mm) SOIC (DW) 20 131.84 mm² (12.8 mm × 10.3 mm) VQFN (RGY) 20 15.75 mm² (4.5 mm × 3.5 mm)
  • 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 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 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 JESD 78
  • 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-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 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 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 JESD 78
  • 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 PCA9544A is a 4-channel, bidirectional translating multiplexer controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. One SCL/SDA pair can be selected at a time, and this is determined by the contents of the programmable control register. Four interrupt inputs ( INT3INT0), 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 puts the registers in their default state and initializes the I2C state machine, with no channel selected.

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 PCA9544A. 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 PCA9544A is a 4-channel, bidirectional translating multiplexer controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. One SCL/SDA pair can be selected at a time, and this is determined by the contents of the programmable control register. Four interrupt inputs ( INT3INT0), 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 puts the registers in their default state and initializes the I2C state machine, with no channel selected.

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 PCA9544A. 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.

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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt PCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer With Interrupt Logic datasheet (Rev. G) PDF | HTML 11.03.2021
Anwendungshinweis I2C Solutions for Hot Swap Applications (Rev. A) 31.01.2023
Anwendungshinweis I2C Dynamic Addressing 25.04.2019
Anwendungshinweis Choosing the Correct I2C Device for New Designs PDF | HTML 07.09.2016
Anwendungshinweis Understanding the I2C Bus PDF | HTML 30.06.2015
Anwendungshinweis Maximum Clock Frequency of I2C Bus Using Repeaters 15.05.2015
Anwendungshinweis I2C Bus Pull-Up Resistor Calculation PDF | HTML 13.02.2015
Anwendungshinweis Troubleshooting I2C Bus Protocol 19.10.2009

Design und Entwicklung

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Simulationsmodell

PCA9544A IBIS Model

SCPM004.ZIP (149 KB) - IBIS-Modell
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