PCA9544A
- 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 ( INT3– INT0), 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.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | PCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer With Interrupt Logic datasheet (Rev. G) | PDF | HTML | 2021. 3. 11 | |
| 애플리케이션 노트 | I2C Solutions for Hot Swap Applications (Rev. A) | 2023. 1. 31 | |||
| 애플리케이션 노트 | I2C Dynamic Addressing | 2019. 4. 25 | |||
| 애플리케이션 노트 | Choosing the Correct I2C Device for New Designs | PDF | HTML | 2016. 9. 7 | ||
| 애플리케이션 노트 | Understanding the I2C Bus | PDF | HTML | 2015. 6. 30 | ||
| 애플리케이션 노트 | Maximum Clock Frequency of I2C Bus Using Repeaters | 2015. 5. 15 | |||
| 애플리케이션 노트 | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 2015. 2. 13 | ||
| 애플리케이션 노트 | Troubleshooting I2C Bus Protocol | 2009. 10. 19 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
I2C-DESIGNER — I2C 디자이너 툴
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
| TVSOP (DGV) | 20 | Ultra Librarian |
| SOIC (DW) | 20 | Ultra Librarian |
| VQFN (RGY) | 20 | Ultra Librarian |
주문 및 품질
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.