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TCA9548A Datasheet(PDF) 1 Page - Texas Instruments |
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TCA9548A Datasheet(HTML) 1 Page - Texas Instruments |
1 / 36 page TCA9548A Slaves A0, A1...AN Slaves B0, B1...BN Slaves H0, H1...HN I2C or SMBus Master (processor) SDA SCL SD0 SC0 Channel 0 Channel 1 Channel 7 RESET SD1 SC1 SD7 SC7 VCC A1 A2 GND A0 Slaves C0, C1...CN Channel 2 SD2 SC2 Product Folder Sample & Buy Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 TCA9548A Low-Voltage 8-Channel I2C Switch with Reset 1 1 Features 1 • 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 1.8-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-V Tolerant Inputs • 0- 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) 2 Applications • Servers • Routers (Telecom Switching Equipment) • Factory Automation • Products With I2C Slave Address Conflicts (Such as Multiple, Identical Temperature Sensors) 3 Description 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 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 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 should 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 1.8-V, 2.5- V or 3.3-V parts can communicate with 5-V 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 5-V tolerant. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) TCA9548A TSSOP (24) 7.80 mm × 4.40 mm VQFN (24) 4.00 mm × 4.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Application Diagram |
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