Data Sheet

ManualsBrandsSparkfun Electronics ManualsI2CSparkFun Qwiic Mux Breakout Board - 8 Channel (TCA9548A)

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

GND

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 I

C Switch with Reset

1 Features

• 1-to-8 Bidirectional Translating Switches

• I

C Bus and SMBus Compatible

• Active-Low Reset Input

• Three Address Pins, Allowing up to Eight

TCA9548A Devices on the I

C Bus

• Channel Selection Through an I

C Bus, In Any

Combination

• Power Up With All Switch Channels Deselected

• Low R

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 I

C 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 I

C 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 I

C 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 I

C/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 I

C 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

Summary of content (36 pages)

PAGE 1
Product Folder Sample & Buy Support & Community Tools & Software Technical Documents TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 TCA9548A Low-Voltage 8-Channel I2C Switch with Reset 1 Features 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.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com Table of Contents 1 2 3 4 5 6 7 8 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Pin Configuration and Functions ......................... Specifications.............................................
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TCA9548A www.ti.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings (1) over operating free-air temperature range (unless otherwise noted) VCC MIN MAX UNIT Supply voltage –0.5 7 V (2) VI Input voltage –0.
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 6.5 Electrical Characteristics (1) VCC = 2.3 V to 3.6 V, over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VPORR Power-on reset voltage, VCC rising VPORF Power-on reset voltage, VCC falling (4) TEST CONDITIONS No load, VI = VCC or GND (3) No load, VI = VCC or GND (3) VCC MIN TYP (2) MAX 1.2 1.5 0.8 5V 2.6 3.3 V Switch output voltage Vi(sw) = VCC, ISWout = –100 μA 3 V to 3.6 V 1.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com Electrical Characteristics(1) (continued) VCC = 2.3 V to 3.6 V, over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS VO = 0.4 V, IO = 15 mA RON Switch-on resistance VO = 0.4 V, IO = 10 mA MIN TYP (2) VCC MAX 4.5 V to 5.5 V 4 10 20 3 V to 3.6 V 5 12 30 2.3 V to 2.7 V 7 15 45 1.65 V to 1.95 V 10 25 70 UNIT Ω 6.
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 I2C Interface Timing Requirements (continued) over recommended operating free-air temperature range (unless otherwise noted) (see Figure 5) MIN (2) tvdL(Data) Valid-data time (high to low) tvdH(Data) Valid-data time (low to high) (2) SCL low to SDA output high valid tvd(ack) Valid-data time of ACK condition ACK signal from SCL low to SDA output low Cb I2C bus capacitive load MAX SCL low to SDA output low valid UNIT 1 μs 0.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com 6.9 Typical Characteristics 800 1.8 VCC = 5.5V VCC = 3.3V VCC = 1.65V 1.6 ICC, Standby Mode (µA) 700 VOL (mV) 600 500 400 300 200 100 1.2 1 0.8 0.6 25ºC (Room Temperature) 85ºC -40ºC 0.4 0 0 2 4 IOL 6 (mA) 8 10 0.2 1.5 12 2 2.5 3 D003 Figure 1. SDA Output Low Voltage (VOL) vs Load Current (IOL) at Three VCC Levels 4 4.5 5 5.5 D004 30 25ºC (Room Temperature) 85ºC -40º 5.6 25 5.4 20 RON (Ω) 5.2 5 4.8 15 10 4.
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 7 Parameter Measurement Information VCC R L = 1 kW SDA DUT CL = 50 pF (see Note A) SDA LOAD CONFIGURATION Three Bytes for Complete Device Programming Address Stop Start Bit 7 Address Condition Condition Bit 6 (MSB) (P) (S) R/W Bit 0 (LSB) Address Bit 1 tscl ACK (A) Data Bit 7 (MSB) Data Bit 0 (LSB) Stop Condition (P) tsch 0.7 ´ VCC SCL 0.3 ´ VCC ticr tvd(ack) ticf tbuf tsp tsts tvdH(Data) 0.7 ´ VCC SDA 0.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com Parameter Measurement Information (continued) VCC RL = 1 kW DUT SDA CL = 50 pF (see Note A) SDA LOAD CONFIGURATION Start SCL ACK or Read Cycle SDA 0.3 VCC tRESET RESET VCC/2 tREC tw SDn, SCn 0.3 VCC tRESET A. CL includes probe and jig capacitance. B. All inputs are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr/tf ≤ 30 ns. C. I/Os are configured as inputs. D.
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 8 Detailed Description 8.1 Overview The TCA9548A is an 8-channel, bidirectional translating I2C switch. The master SCL/SDA signal pair is directed to eight channels of slave devices, SC0/SD0-SC7/SD7. Any individual downstream channel can be selected as well as any combination of the eight channels.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com 8.
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 8.3 Feature Description The TCA9548A is an 8-channel, bidirectional translating switch for I2C buses that supports Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation. The TCA9548A features I2C control using a single 8-bit control register in which each bit controls the enabling and disabling of one of the corresponding 8 switch channels for I2C data flow.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com Programming (continued) – Master-receiver terminates the transfer with a STOP condition. SCL SDA Data Transfer START Condition STOP Condition Figure 7. Definition of Start and Stop Conditions SDA line stable while SCL line is high SCL 1 0 1 0 1 0 1 0 ACK MSB Bit Bit Bit Bit Bit Bit LSB ACK SDA Byte: 1010 1010 ( 0xAAh ) Figure 8. Bit Transfer 8.5.2 Device Address Figure 9 shows the address byte of the TCA9548A.
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 Programming (continued) The last bit of the slave address defines the operation (read or write) to be performed. When it is high (1), a read is selected, while a low (0) selects a write operation. Table 1 shows the TCA9548A address reference. Table 1.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com Master controls SDA line Slave controls SDA line Write to one register in a device Control Register (8 bits) Device (Slave) Address (7 bits) S 1 1 1 0 START A2 A1 A0 0 R/W=0 A B7 B6 B5 B4 B3 B2 B1 B0 ACK A P ACK STOP Figure 10. Write to Register 8.5.3.2 Reads Reading from a slave is very similar to writing, but the master sends a START condition, followed by the slave address with the R/W bit set to 1 (signifying a read).
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 8.5.4 Control Register Following the successful acknowledgment of the address byte, the bus master sends a command byte that is stored in the control register in the TCA9548A (see Figure 12). This register can be written and read via the I2C bus. Each bit in the command byte corresponds to a SCn/SDn channel and a high (or 1) selects this channel. Multiple SCn/SDn channels may be selected at the same time.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com 8.5.5 RESET Input The RESET input is an active-low signal that may be used to recover from a bus-fault condition. When this signal is asserted low for a minimum of tWL, the TCA9548A resets its registers and I2C state machine and deselects all channels. The RESET input must be connected to VCC through a pull-up resistor. 8.5.
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com Typical Application (continued) VDPUM = 1.65 V to 5.5 V VCC VDPU0 = 1.65 V to 5.5 V 24 VCC 23 SDA I2C/SMBus 22 SCL Master 3 RESET 4 SDA SD0 SCL SC0 Channel 0 5 VDPU1 = 1.65 V to 5.5 V RESET SD1 6 SC1 7 Channel 1 VDPU2 = 1.65 V to 5.5 V SD2 SC2 8 Channel 2 9 VDPU3 = 1.65 V to 5.5 V 10 SD3 SC3 Channel 3 11 VDPU4 = 1.65 V to 5.5 V TCA9548A 13 SD4 SC4 Channel 4 14 VDPU5 = 1.65 V to 5.
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 Typical Application (continued) 9.2.1 Design Requirements A typical application of the TCA9548A contains one or more data pull-up voltages, VDPUX, one for the master device (VDPUM) and one for each of the selectable slave channels (VDPU0 – VDPU7). In the event where the master device and all slave devices operate at the same voltage, then VDPUM = VDPUX = VCC.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com Typical Application (continued) 9.2.3 Application Curves 25 5 20 Rp(max) (kOhm) 4 Vpass (V) Standard-mode Fast-mode 25ºC (Room Temperature) 85ºC -40ºC 3 2 15 10 5 1 0 0 0 0.5 1 Standard-mode (fSCL kHz, tr 1.5 2 2.5 3 VCC (V) 3.5 4 4.5 5 0 5.5 50 100 150 200 250 Cb (pF) D007 SPACE (fSCL kHz, tr) Standard-mode (fSCL = 100 kHz, tr = 1 µs) Figure 14.
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 10 Power Supply Recommendations The operating power-supply voltage range of the TCA9548A is 1.65 V to 5.5 V applied at the VCC pin. When the TCA9548A is powered on for the first time or anytime the device must be reset by cycling the power supply, the power-on reset requirements must be followed to ensure the I2C bus logic is initialized properly. 10.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com VPOR is critical to the power-on reset. VPOR is the voltage level at which the reset condition is released and all the registers and the I2C/SMBus state machine are initialized to their default states. The value of VPOR differs based on the VCC being lowered to or from 0. Figure 19 and Table 3 provide more details on this specification. VCC VPORR VPORF Time POR Time Figure 19.
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TCA9548A www.ti.com SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 11 Layout 11.1 Layout Guidelines For PCB layout of the TCA9548A, common PCB layout practices must be followed but additional concerns related to high-speed data transfer such as matched impedances and differential pairs are not a concern for I2C signal speeds.
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TCA9548A SCPS207F – MAY 2012 – REVISED NOVEMBER 2016 www.ti.com 12 Device and Documentation Support 12.1 Documentation Support 12.1.1 Related Documentation For related documentation see the following: • I2C Bus Pull-Up Resistor Calculation • Maximum Clock Frequency of I2C Bus Using Repeaters • Introduction to Logic • Understanding the I2C Bus • Choosing the Correct I2C Device for New Designs • TCA9548AEVM User's Guide 12.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 18-Nov-2016 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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PACKAGE MATERIALS INFORMATION www.ti.com 22-Nov-2016 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing TCA9548AMRGER VQFN TCA9548APWR TCA9548ARGER SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 4.25 1.15 8.0 12.0 Q1 RGE 24 3000 330.0 12.4 4.25 TSSOP PW 24 2000 330.0 16.4 6.95 8.3 1.6 8.0 16.0 Q1 VQFN RGE 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 22-Nov-2016 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TCA9548AMRGER VQFN RGE 24 3000 367.0 367.0 35.0 TCA9548APWR TSSOP PW 24 2000 367.0 367.0 38.0 TCA9548ARGER VQFN RGE 24 3000 367.0 367.0 35.
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GENERIC PACKAGE VIEW RGE 24 VQFN - 1 mm max height PLASTIC QUAD FLATPACK - NO LEAD Images above are just a representation of the package family, actual package may vary. Refer to the product data sheet for package details.
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IMPORTANT NOTICE Texas Instruments Incorporated (TI) reserves the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. TI’s published terms of sale for semiconductor products (http://www.ti.com/sc/docs/stdterms.