Overview
The PCA9511AD,118 from NXP USA Inc. is a hot swappable I²C-bus and SMBus buffer designed to facilitate the insertion and removal of I/O cards into a live backplane without corrupting the data and clock buses. This component ensures seamless communication between the backplane and the card by providing bidirectional buffering and isolating the capacitances of the backplane and the card. It is particularly useful in applications where hot swapping is necessary, such as in industrial, automotive, and consumer electronics.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power supply voltage (VCC) | 2.7 | 5.5 | V | ||
| Supply current (ICC) | VCC = 5.5 V; VSDAIN = VSCLIN = 0 V | 3.5 | 6 | mA | |
| Shut-down mode supply current (ICC(sd)) | VENABLE = 0 V; all other pins at VCC or GND | 0.1 | µA | ||
| Clock frequency | 0 | 400 | kHz | ||
| Operating temperature range | -40 | 85 | °C | ||
| Maximum junction temperature (Tj(max)) | 125 | °C |
Key Features
- Bidirectional buffer for SDA and SCL lines, increasing fan-out and preventing SDA and SCL corruption during live board insertion and removal from multipoint backplane systems.
- Compatible with I²C-bus Standard-mode, I²C-bus Fast-mode, and SMBus standards.
- Built-in ∆V/∆t rise time accelerators on all SDA and SCL lines.
- Active HIGH ENABLE input and active HIGH READY open-drain output.
- High-impedance SDA and SCL pins for VCC = 0 V.
- 1 V precharge on all SDA and SCL lines.
- Supports clock stretching and multiple master arbitration/synchronization.
- ESD protection exceeds 2000 V HBM per JESD22-A114.
Applications
- Industrial control systems: For hot-swappable I/O cards in industrial automation and control systems.
- Automotive electronics: In vehicle networks and other automotive applications requiring hot-swappable components.
- Consumer electronics: In devices that require the ability to insert or remove cards without disrupting the system.
- Data centers and servers: For hot-swappable I/O cards in data center and server environments.
Q & A
- What is the primary function of the PCA9511AD,118?
The PCA9511AD,118 is a hot swappable I²C-bus and SMBus buffer that allows I/O card insertion into a live backplane without corrupting the data and clock buses. - What are the compatible bus standards for the PCA9511AD,118?
The PCA9511AD,118 is compatible with I²C-bus Standard-mode, I²C-bus Fast-mode, and SMBus standards. - What is the operating voltage range of the PCA9511AD,118?
The operating voltage range is from 2.7 V to 5.5 V. - What is the maximum clock frequency supported by the PCA9511AD,118?
The maximum clock frequency supported is 400 kHz. - Does the PCA9511AD,118 support clock stretching and multiple master arbitration?
Yes, it supports clock stretching and multiple master arbitration/synchronization. - How does the PCA9511AD,118 protect against ESD?
The PCA9511AD,118 has ESD protection that exceeds 2000 V HBM per JESD22-A114. - What is the purpose of the ENABLE and READY pins on the PCA9511AD,118?
The ENABLE pin enables the device when asserted HIGH and forces it into a low current mode when asserted LOW. The READY pin indicates whether the backplane and card sides are connected. - How does the PCA9511AD,118 handle capacitance during hot swapping?
The PCA9511AD,118 isolates the capacitances of the backplane and the card, and it precharges the SDA and SCL lines to 1 V to minimize the current required to charge the parasitic capacitance. - What is the maximum junction temperature for the PCA9511AD,118?
The maximum junction temperature is 125°C. - What is the operating temperature range for the PCA9511AD,118?
The operating temperature range is from -40°C to 85°C.
