Overview
The PCA9511ADP,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 isolating the capacitances and preventing bus contention. It is particularly useful in systems where hot swapping of cards is necessary, such as in cPCI, VME, and AdvancedTCA systems.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | TSSOP-8 |
| 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 |
| Precharge Voltage | 1 V precharge on all SDA and SCL lines |
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 (0.6 V threshold).
- Active HIGH ENABLE input and Active HIGH READY open-drain output.
- High-impedance SDA and SCL pins for VCC = 0 V.
- Supports clock stretching and multiple master arbitration/synchronization.
- 1 V precharge on all SDA and SCL lines to minimize the current required to charge the parasitic capacitance of the chip.
Applications
The PCA9511ADP,118 is suitable for various applications where hot swapping of I/O cards is required, such as in:
- cPCI (CompactPCI) systems.
- VME (VersaModule Eurocard) systems.
- AdvancedTCA (Advanced Telecom Computing Architecture) systems.
- Multipoint backplane systems where the insertion and removal of cards without disrupting the bus is crucial.
Q & A
- What is the primary function of the PCA9511ADP,118?
The PCA9511ADP,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 PCA9511ADP,118?
The PCA9511ADP,118 is compatible with I²C-bus Standard-mode, I²C-bus Fast-mode, and SMBus standards.
- What is the operating power supply voltage range for the PCA9511ADP,118?
The operating power supply voltage range is from 2.7 V to 5.5 V.
- What is the clock frequency range supported by the PCA9511ADP,118?
The clock frequency range is from 0 Hz to 400 kHz.
- Does the PCA9511ADP,118 have built-in rise time accelerators?
Yes, it has built-in ∆V/∆t rise time accelerators on all SDA and SCL lines (0.6 V threshold).
- What is the purpose of the ENABLE input and READY output pins?
The ENABLE input pin enables the device when asserted HIGH and forces it into a low current mode when asserted LOW. The READY output pin indicates whether the backplane and card sides are connected (HIGH) or not (LOW).
- How does the PCA9511ADP,118 handle ESD protection?
The PCA9511ADP,118 exceeds 2000 V HBM per JESD22-A114 for ESD protection.
- What is the precharge voltage on the SDA and SCL lines?
The SDA and SCL lines are precharged to 1 V to minimize the current required to charge the parasitic capacitance of the chip.
- Can the PCA9511ADP,118 support clock stretching and multiple master arbitration?
Yes, it supports clock stretching and multiple master arbitration/synchronization.
- In what types of systems is the PCA9511ADP,118 typically used?
The PCA9511ADP,118 is typically used in cPCI, VME, and AdvancedTCA systems, as well as in multipoint backplane systems.
