Overview
The PCA9518APW, produced by NXP USA Inc., is a CMOS integrated circuit designed for use in I²C-bus and SMBus systems. This expandable 5-channel I²C-bus hub is intended to extend the capabilities of I²C-bus systems by buffering both the data (SDA) and clock (SCL) lines. This allows for the division of the bus into multiple segments, each with its own repeater delay, thereby enabling the connection of a virtually unlimited number of devices without degrading system performance.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Manufacturer Part Number | PCA9518APW,512 | - |
| Manufacturer | NXP USA Inc. | - |
| Description | IC I2C HUB 5CH EXPANDBL 20-TSSOP | - |
| Voltage - Supply | 3 V ~ 3.6 V | - |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) | - |
| Mounting Type | Surface Mount | - |
| Interface | I²C, SMBus | - |
| Supply Current (HIGH) | VDD = 3.6 V; SDAn = SCLn = VDD | 7.5 - 10 mA |
| Supply Current (LOW) | VDD = 3.6 V; one SDA and one SCL = VSS | - |
Key Features
- Expandable 5-channel I²C-bus hub: Allows the extension of the I²C-bus in increments of five with only one repeater delay per segment.
- I²C-bus and SMBus compatible: Retains all operating modes and features of the I²C-bus system.
- Active-High Individual Repeater Enable Inputs: Each enable pin controls its associated SDA and SCL ports.
- Open-Drain Input/Outputs: Supports standard low-level contention arbitration of the I²C bus.
- Lock-up Free Operation: Ensures that the system does not lock up during operation.
- Multiple Masters Support: Each segment can have multiple masters.
- 4-Wire Inter-Hub Expansion Bus: Allows communication between multiple PCA9518A hubs.
Applications
The PCA9518APW is primarily used as a buffer in I²C-bus and SMBus systems. It is particularly useful in applications where the I²C-bus needs to be extended beyond the standard 400 pF capacitance limit, such as in complex embedded systems, industrial automation, and consumer electronics where multiple devices need to be connected on the same bus.
Q & A
- What is the primary function of the PCA9518APW?
The PCA9518APW is an expandable 5-channel I²C-bus hub designed to extend the I²C-bus by buffering both the data (SDA) and clock (SCL) lines.
- What is the voltage supply range for the PCA9518APW?
The voltage supply range is from 3 V to 3.6 V.
- What type of package does the PCA9518APW come in?
The PCA9518APW comes in a 20-TSSOP package.
- Is the PCA9518APW compatible with SMBus systems?
Yes, it is compatible with both I²C-bus and SMBus systems.
- How does the PCA9518APW handle repeater delays?
The PCA9518APW allows for the extension of the I²C-bus in increments of five with only one repeater delay per segment.
- Can the PCA9518APW support multiple masters on each segment?
Yes, it supports multiple masters on each segment.
- What is the purpose of the enable pins on the PCA9518APW?
The enable pins (EN1 through EN4) are active HIGH and control the associated SDA and SCL ports.
- How does the PCA9518APW prevent lock-up conditions?
The PCA9518APW ensures lock-up free operation by using shifting instead of static offsets to avoid lock-up conditions.
- Can the PCA9518APW be used in series with other I²C-bus hubs?
Yes, it can be used in series with other PCA9518A parts, but not with certain other NXP I²C-bus hubs like PCA9510/9511/9513/9514.
- What is the environmental compliance status of the PCA9518APW?
The PCA9518APW is PbFree, EU RoHS compliant, and Halogen Free, with a REACH SVHC declaration.
