Overview
The PCA9547BS,118 is an 8-channel I2C-bus multiplexer produced by NXP USA Inc. This device is designed to control and manage multiple I2C-bus channels, allowing a single master device to communicate with up to eight downstream slave devices. The PCA9547 is particularly useful in systems where multiple I2C devices share the same bus, enabling selective communication and preventing bus conflicts. It supports voltage level translation between different voltage levels (1.8 V, 2.5 V, 3.3 V, and 5 V), making it versatile for various system designs.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 8 |
| Bus Interface | I2C-bus, compatible with SMBus standards |
| Address Pins | 3 (allowing up to 8 devices on the I2C-bus) |
| Reset Input | Active LOW |
| Power Supply Voltage Range | 2.3 V to 5.5 V |
| Clock Frequency Range | 0 Hz to 400 kHz |
| Input Tolerance | 5 V tolerant inputs |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 |
| Package Options | SO24, TSSOP24, HVQFN24 |
Key Features
- 1-of-8 bidirectional translating multiplexer
- I2C-bus interface logic; compatible with SMBus standards
- Active LOW RESET input for recovering from bus fault conditions
- Channel selection via I2C-bus, one channel at a time
- Power-up with all channels deselected except Channel 0 which is connected
- Low Ron multiplexers for minimal signal degradation
- 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
- ESD protection and latch-up testing according to JEDEC standards
Applications
The PCA9547BS,118 is suitable for a variety of applications where multiple I2C devices need to be managed efficiently. These include:
- Embedded systems requiring multiple I2C peripherals
- Industrial automation systems with multiple sensors and actuators
- Consumer electronics such as TVs, set-top boxes, and gaming consoles
- Automotive systems with multiple I2C-based components
- Medical devices requiring precise control over multiple I2C interfaces
Q & A
- What is the primary function of the PCA9547BS,118?
The PCA9547BS,118 is an 8-channel I2C-bus multiplexer that allows a single master device to communicate with up to eight downstream slave devices. - What voltage levels does the PCA9547BS,118 support for voltage translation?
The device supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses. - How does the PCA9547BS,118 handle power-up?
The device powers up with all channels deselected except Channel 0, which is connected, allowing immediate communication between the master and downstream devices on that channel. - What is the purpose of the RESET input on the PCA9547BS,118?
The active LOW RESET input allows the device to recover from a situation where one of the downstream I2C-buses is stuck in a LOW state. - What are the package options available for the PCA9547BS,118?
The device is available in SO24, TSSOP24, and HVQFN24 packages. - Does the PCA9547BS,118 support hot insertion?
Yes, the device supports hot insertion. - What is the clock frequency range of the PCA9547BS,118?
The clock frequency range is from 0 Hz to 400 kHz. - Is the PCA9547BS,118 tolerant to 5 V inputs?
Yes, the device has 5 V tolerant inputs. - What kind of ESD protection does the PCA9547BS,118 offer?
The device offers ESD protection exceeding 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101. - How many address pins does the PCA9547BS,118 have?
The device has 3 address pins, allowing up to 8 devices on the I2C-bus.
