Overview
The PCA9545APW,112, produced by NXP USA Inc., is a quad bidirectional translating switch controlled via the I²C-bus. This component is designed to fan out the SCL/SDA upstream pair to four downstream pairs or channels, enabling flexible and efficient communication between multiple devices on the I²C-bus. It features interrupt logic and reset functions, making it suitable for a variety of applications requiring robust and reliable I²C-bus switching.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 4 |
| I²C-bus Interface | Compatible with SMBus standards |
| Interrupt Inputs | Four active LOW interrupt inputs (INT0 to INT3) |
| Interrupt Output | One active LOW interrupt output (INT) |
| Reset Input | Active LOW reset input |
| Address Pins | Two address pins allowing up to four devices on the I²C-bus |
| Channel Selection | Via I²C-bus, in any combination |
| Power-Up State | All switch channels deselected |
| Voltage Level Translation | Between 1.8 V, 2.5 V, 3.3 V, and 5 V buses |
| Operating Power Supply Voltage | 2.3 V to 5.5 V |
| Input Tolerance | 5 V tolerant inputs |
| Clock Frequency | 0 Hz to 400 kHz |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 |
| Latch-Up Protection | Exceeds 100 mA per JESD78 |
| Package Types | SO20, TSSOP20, and HVQFN20 |
Key Features
- 1-of-4 bidirectional translating switches
- I²C-bus interface logic compatible with SMBus standards
- Four active LOW interrupt inputs and one active LOW interrupt output
- Active LOW reset input
- Allows voltage level translation between different bus voltages
- No glitch on power-up
- Supports hot insertion
- Low standby current
- ESD protection and latch-up protection
Applications
The PCA9545APW,112 is suitable for various applications requiring multiple I²C-bus devices to be connected and managed efficiently. These include:
- Industrial automation systems
- Consumer electronics with multiple I²C-bus peripherals
- Automotive systems requiring robust I²C-bus switching
- Medical devices with multiple sensor and actuator interfaces
- Embedded systems needing flexible I²C-bus management
Q & A
- What is the primary function of the PCA9545APW,112?
The primary function is to act as a quad bidirectional translating switch controlled via the I²C-bus, allowing the SCL/SDA upstream pair to fan out to four downstream pairs. - How many interrupt inputs does the PCA9545APW,112 have?
It has four active LOW interrupt inputs (INT0 to INT3). - What is the purpose of the reset input on the PCA9545APW,112?
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. - Can the PCA9545APW,112 handle different bus voltages?
Yes, it allows voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses. - What is the operating power supply voltage range of the PCA9545APW,112?
The operating power supply voltage range is from 2.3 V to 5.5 V. - Is the PCA9545APW,112 tolerant to 5 V inputs?
Yes, all I/O pins are 5 V tolerant. - What is the maximum clock frequency supported by the PCA9545APW,112?
The maximum clock frequency is 400 kHz. - Does the PCA9545APW,112 support hot insertion?
Yes, it supports hot insertion. - What kind of ESD protection does the PCA9545APW,112 have?
It exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101. - What package types are available for the PCA9545APW,112?
The component is available in SO20, TSSOP20, and HVQFN20 packages.
