Overview
The PCA9548ADBR, produced by Texas Instruments, is an 8-channel I2C/SMBus switch with reset and voltage translation capabilities. This device is designed to manage multiple I2C or SMBus devices on a single bus, resolving potential address conflicts and enabling communication between devices operating at different voltage levels. The PCA9548ADBR is packaged in a 24-pin SSOP (DB) package and operates over a wide temperature range of -40°C to 85°C.
Key Specifications
| Specification | Value |
|---|---|
| Package | SSOP (DB), 24 pins |
| Operating Temperature Range | -40°C to 85°C |
| Operating Power-Supply Voltage Range | 2.3 V to 5.5 V |
| Clock Frequency | 0 kHz to 400 kHz |
| Input Voltage Tolerance | 5-V tolerant inputs |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| Latch-Up Performance | Exceeds 100 mA per JESD 78, Class II |
Key Features
- 1-of-8 bidirectional translating switches
- I2C bus and SMBus compatible
- Active-low reset input
- Three hardware address pins for up to eight PCA9548A devices on the I2C bus
- Channel selection via I2C bus
- Power-up with all switch channels deselected
- Low RON switches
- 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
Applications
The PCA9548ADBR is ideal for applications where multiple I2C or SMBus devices need to be connected to a single bus, such as in industrial control systems, automotive systems, and consumer electronics. It is particularly useful in scenarios where address conflicts need to be resolved, such as when using multiple identical sensors or other I2C devices.
Q & A
- What is the PCA9548ADBR used for?
The PCA9548ADBR is used to manage multiple I2C or SMBus devices on a single bus, resolving address conflicts and enabling voltage-level translation. - What is the operating temperature range of the PCA9548ADBR?
The operating temperature range is -40°C to 85°C. - What is the power-supply voltage range of the PCA9548ADBR?
The operating power-supply voltage range is 2.3 V to 5.5 V. - How many channels does the PCA9548ADBR support?
The PCA9548ADBR supports eight bidirectional translating switches. - Is the PCA9548ADBR compatible with both I2C and SMBus?
Yes, the PCA9548ADBR is compatible with both I2C and SMBus. - What is the purpose of the active-low reset input?
The active-low reset input allows the system master to reset the PCA9548ADBR in case of a time-out or other improper operation. - Can the PCA9548ADBR support hot insertion?
Yes, the PCA9548ADBR supports hot insertion. - What is the clock frequency range of the PCA9548ADBR?
The clock frequency range is 0 kHz to 400 kHz. - Is the PCA9548ADBR protected against ESD?
Yes, the PCA9548ADBR has ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model. - How many PCA9548A devices can be used on the same I2C bus?
Up to eight PCA9548A devices can be used on the same I2C bus using the three hardware address pins.
