Overview
The PCA9545APW,118, produced by NXP USA Inc., is a quad bidirectional translating switch controlled via the I²C-bus. This component is part of the PCA9545A/45B/45C series, which are identical except for the fixed portion of the target address. The device allows the SCL/SDA upstream pair to fan out to four downstream pairs or channels, enabling flexible and efficient communication between multiple I²C devices.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VDD) | 2.3 | 3.6 | V | ||
| Supply Current (IDD) | Operating mode; VDD = 3.6 V; no load; VI = VDD or VSS; fSCL = 100 kHz | - | 10 | 30 | μA |
| Standby Current (Istb) | Standby mode; VDD = 3.6 V; no load; VI = VDD or VSS | 0.1 | 1 | μA | |
| Power-on Reset Voltage (VPOR) | No load; VI = VDD or VSS | 1.6 | 2.1 | V | |
| LOW-level Input Voltage (VIL) | -0.5 | 0.3VDD | V | ||
| HIGH-level Input Voltage (VIH) | 0.7VDD | 6 | V | ||
| LOW-level Output Current (IOL) | VOL = 0.6 V | 6 | 10 | mA | |
| Leakage Current (IL) | VI = VDD or VSS | -1 | 1 | μA | |
| Input Capacitance (Ci) | VI = VSS | 10 | 13 | pF | |
| Operating Temperature (Tamb) | -40 | 85 | °C | ||
| Package Type | 20-TSSOP |
Key Features
- 1-of-4 bidirectional translating switches
- I²C-bus interface logic; compatible with SMBus standards
- Four active LOW interrupt inputs (INT0 to INT3) and one active LOW interrupt output (INT)
- Active LOW reset input to recover from stuck I²C-bus states
- Two address pins allowing up to four devices on the I²C-bus
- Channel selection via I²C-bus, in any combination
- Pass gates constructed to allow different bus voltages (1.8 V, 2.5 V, 3.3 V, 5 V) without additional protection
- All I/O pins are 5 V tolerant
Applications
- Embedded systems requiring multiple I²C devices
- Industrial automation and control systems
- Automotive electronics for managing multiple sensors and actuators
- Consumer electronics such as smart home devices and appliances
- Medical devices requiring multiple I²C interfaces
Q & A
- What is the primary function of the PCA9545APW,118?
The PCA9545APW,118 is a quad bidirectional translating switch controlled via the I²C-bus, allowing the SCL/SDA upstream pair to fan out to four downstream pairs or channels.
- What are the key features of the PCA9545APW,118?
Key features include 1-of-4 bidirectional translating switches, I²C-bus interface logic compatible with SMBus standards, four active LOW interrupt inputs, an active LOW interrupt output, and an active LOW reset input.
- What is the operating voltage range of the PCA9545APW,118?
The operating voltage range is from 2.3 V to 3.6 V.
- How does the PCA9545APW,118 handle different bus voltages?
The device allows the use of different bus voltages on each pair, such as 1.8 V, 2.5 V, 3.3 V, and 5 V, without any additional protection.
- What is the purpose of the reset input on the PCA9545APW,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.
- How many devices can be connected to the I²C-bus using the PCA9545APW,118?
Up to four devices can be connected to the I²C-bus using the two address pins.
- What is the package type of the PCA9545APW,118?
The package type is 20-TSSOP.
- What is the operating temperature range of the PCA9545APW,118?
The operating temperature range is from -40°C to +85°C.
- Are the I/O pins of the PCA9545APW,118 5 V tolerant?
- What are some common applications of the PCA9545APW,118?
