TCA9548A
- 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.
기술 자료
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | TCA9548A Low-Voltage 8-Channel I2 C Switch with Reset datasheet (Rev. H) | PDF | HTML | 2024/09/30 |
| Application note | PassFET Hang Time with TCA39306 I2C, I3C Level Translator | PDF | HTML | 2024/09/23 | |
| Application brief | Best Practices: I2C Devices on an I3C Shared Bus | PDF | HTML | 2023/03/30 | |
| Application note | I2C Solutions for Hot Swap Applications (Rev. A) | 2023/01/31 | ||
| Application note | I2C Dynamic Addressing | 2019/04/25 | ||
| Application note | Choosing the Correct I2C Device for New Designs | PDF | HTML | 2016/09/07 | |
| Selection guide | I2C Infographic Flyer | 2015/12/03 | ||
| Technical article | How to simplify I2C tree when connecting multiple slaves to an I2C master | PDF | HTML | 2015/10/15 | |
| Application note | Understanding the I2C Bus | PDF | HTML | 2015/06/30 | |
| Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | 2015/05/15 | ||
| Application note | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 2015/02/13 | |
| EVM User's guide | TCA9548AEVM User's Guide | 2014/04/23 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
TCA9548AEVM — TCA9548A I2C 1-8 양방향 변환 스위치 평가 모듈
The TCA9548AEVM is designed to evaluate and demonstrate the functionality of TI’s TCA954xA family of I2C switches. The TCA9548AEVM can be used as a standalone evaluation module to interface with an existing system or paired with the MSP430 Lauchpad which serves as the I2C master and power supply (...)
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| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| TSSOP (PW) | 24 | Ultra Librarian |
| VQFN (RGE) | 24 | Ultra Librarian |
| VSSOP (DGS) | 24 | Ultra Librarian |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.