PCA9548A是TI公司的一款I2C多路复用器、开关产品，PCA9548A是具有复位功能的 8 通道 I2C 开关，本页介绍了PCA9548A的产品说明、应用、特性等，并给出了与PCA9548A相关的TI元器件型号供参考。
PCA9548A - 具有复位功能的 8 通道 I2C 开关 - I2C多路复用器、开关 - I2C - TI公司（Texas Instruments，德州仪器）
- 1-of-8 Bidirectional Translating Switches
- I2C Bus and SMBus Compatible
- Active-Low Reset Input
- Three Hardware Address Pins for Use of up to Eight PCA9548A 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 Vto5.5 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)
- Servers
- Routers (Telecom Switching Equipment)
- Factory Automation
- Products With I2C Slave Address Conflicts (e.g. Multiple, Identical Temp Sensors)
The PCA9548A has eight bidirectional translating switches that can be controlled via the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register.
The system master can reset the PCA9548A in the event of a timeout 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/initialization to occur without powering down the part.
| DEVICE NAME | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| PCA9548A | TSSOP (24) | 7.80 mm × 4.40 mm |
| VQFN (24) | 4.00 mm × 4.00 mm |
