Overview
The PCA9511A, produced by 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 integration and operation in multipoint backplane systems, making it ideal for applications requiring robust and reliable communication over the I²C and SMBus protocols.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Power Supply Voltage | 2.7 V to 5.5 V |
| Clock Frequency | 0 Hz to 400 kHz |
| Compatibility | I²C-bus Standard-mode, I²C-bus Fast-mode, and SMBus standards |
| Rise Time Accelerators | Built-in ∆V/∆t rise time accelerators on all SDA and SCL lines (0.6 V threshold) |
| ENABLE Input | Active HIGH ENABLE input |
| READY Output | Active HIGH READY open-drain output |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114 |
| SDA and SCL Pins | High-impedance for VCC = 0 V, 1 V precharge on all SDA and SCL lines |
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, 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 to minimize current required during insertion.
- Supports clock stretching and multiple master arbitration/synchronization.
Applications
The PCA9511A is suitable for various applications requiring hot swappable I/O cards, including but not limited to:
- Multipoint backplane systems.
- Industrial control systems.
- Automotive systems.
- Medical devices.
- Any system where I/O cards need to be inserted or removed without disrupting the bus operation.
Q & A
- What is the primary function of the PCA9511A? The PCA9511A 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 PCA9511A? The PCA9511A is compatible with I²C-bus Standard-mode, I²C-bus Fast-mode, and SMBus standards.
- What is the operating power supply voltage range for the PCA9511A? The operating power supply voltage range is from 2.7 V to 5.5 V.
- What is the purpose of the ENABLE input pin? The ENABLE input pin enables the device when asserted HIGH and forces the device into a low current mode when asserted LOW.
- What is the function of the READY output pin? The READY output pin indicates that the backplane and card sides are connected together (HIGH) or not (LOW).
- Does the PCA9511A support clock stretching and multiple master arbitration? Yes, the PCA9511A supports clock stretching and multiple master arbitration/synchronization.
- What is the ESD protection level of the PCA9511A? The ESD protection exceeds 2000 V HBM per JESD22-A114.
- How do the rise time accelerators work on the PCA9511A? The built-in ∆V/∆t rise time accelerators on all SDA and SCL lines allow the use of weaker DC pull-up currents while meeting rise time requirements.
- What is the significance of the 1 V precharge on SDA and SCL lines? The 1 V precharge minimizes the current required to charge the parasitic capacitance of the chip during insertion.
- In what types of systems is the PCA9511A typically used? The PCA9511A is typically used in multipoint backplane systems, industrial control systems, automotive systems, and medical devices.
