Overview
The PCA9511ADMR2G, produced by onsemi, is a hot swappable I2C-bus and SMBus buffer. This device is designed to facilitate the insertion and removal of I/O cards into a live backplane without corrupting the data and clock buses. It ensures seamless communication between the backplane and the card by controlling the connection and buffering the signals.
Key Specifications
| Specification | Value |
|---|---|
| Operating Power Supply Voltage | 2.7 V to 5.5 V |
| Clock Frequency | 0 Hz to 400 kHz |
| I2C-Bus Compatibility | Standard-mode, Fast-mode |
| SMBus Compatibility | Yes |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114 |
| ENABLE Input | Active HIGH |
| READY Output | Active HIGH, open-drain |
| Precharge Voltage on SDA and SCL Lines | 1 V |
| Rise Time Accelerator | Built-in, 0.6 V threshold |
Key Features
- Bidirectional buffer for SDA and SCL lines to increase fan out and prevent corruption during live board insertion and removal.
- Compatible with I2C-bus Standard-mode, Fast-mode, and SMBus standards.
- Built-in rise time accelerators on all SDA and SCL lines to meet rise time requirements with weaker DC pull-up currents.
- Active HIGH ENABLE input and active HIGH READY open-drain output.
- High-impedance SDA and SCL pins when VCC = 0 V.
- Supports clock stretching and multiple master arbitration/synchronization.
- Hot swappable, allowing I/O card insertion into a live backplane without data corruption.
Applications
The PCA9511ADMR2G is particularly useful in multipoint backplane systems where I/O cards need to be inserted or removed without disrupting the operation of the system. It is ideal for applications requiring hot swapping, such as in industrial control systems, medical devices, and other environments where downtime needs to be minimized.
Q & A
- What is the primary function of the PCA9511ADMR2G?
The PCA9511ADMR2G 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 I2C-bus modes for the PCA9511ADMR2G?
The device is compatible with I2C-bus Standard-mode and Fast-mode, as well as SMBus standards.
- What is the operating power supply voltage range for the PCA9511ADMR2G?
The operating power supply voltage range is from 2.7 V to 5.5 V.
- Does the PCA9511ADMR2G support clock stretching?
Yes, the device supports clock stretching and multiple master arbitration/synchronization.
- What is the purpose of the ENABLE and READY pins?
The ENABLE input is active HIGH and enables the device when asserted HIGH, while the READY output is an active HIGH, open-drain pin indicating whether the backplane and card sides are connected.
- How does the PCA9511ADMR2G handle rise time requirements?
The device has built-in rise time accelerators on all SDA and SCL lines, allowing the use of weaker DC pull-up currents while still meeting rise time requirements.
- What is the ESD protection level of the PCA9511ADMR2G?
The ESD protection exceeds 2000 V HBM per JESD22-A114.
- What is the precharge voltage on the SDA and SCL lines during insertion?
The SDA and SCL lines are precharged to 1 V to minimize the current required to charge the parasitic capacitance.
- Can the PCA9511ADMR2G be used in high-capacitance environments?
Yes, the device is designed to handle high-capacitance environments by isolating the backplane and card capacitances.
- What are typical applications for the PCA9511ADMR2G?
The device is useful in multipoint backplane systems, industrial control systems, medical devices, and other environments requiring hot swapping.
