Overview
The PCA9517DGKRG4, produced by Texas Instruments, is a 2-bit level-translating I²C/SMBus buffer/repeater. This device is designed to extend the distance of I²C bus signals by buffering and repeating the signals, allowing for the connection of two buses with up to 400-pF bus capacitance each. It is particularly useful in applications where voltage and capacitance isolation between two halves of a bus is necessary. The PCA9517DGKRG4 supports various voltage levels, including 1.8V, 2.5V, 3.3V, and 5V, making it versatile for different system configurations.
Key Specifications
| Parameter | Value |
|---|---|
| Applications | I²C |
| Capacitance | 6 pF |
| Current | 1.5 mA |
| Mounting Type | Surface Mount |
| Number of Channels | 2 |
| Operating Temperature | -40°C ~ 85°C |
| Package | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Supplier Device Package | 8-VSSOP |
| Type | Buffer, ReDriver |
| Voltage | 0.9V ~ 5.5V, 2.7V ~ 5.5V |
| Data Rate (Max) | 400 kHz |
Key Features
- Level Translation: The PCA9517DGKRG4 supports level translation between different voltage levels (1.8V, 2.5V, 3.3V, and 5V), making it suitable for mixed-voltage systems.
- Buffering and Repeating: It buffers and repeats I²C/SMBus signals, allowing for the extension of bus lengths and the connection of multiple buses with high capacitance.
- Overvoltage Tolerance: All inputs and I/Os are overvoltage tolerant up to 5.5V, even when the device is unpowered.
- Star Topology Support: Multiple PCA9517s can be connected in a star topology or in series without accumulating offset voltage, only considering time-of-flight delays.
- Active-High Enable Input: The device features an active-high enable (EN) input with an internal pullup resistor.
Applications
- I²C Bus Extension: Used to extend the length of I²C buses in various applications, including industrial, automotive, and consumer electronics.
- Voltage and Capacitance Isolation: Ideal for isolating two halves of an I²C bus for voltage and capacitance reasons, ensuring reliable communication between different parts of the system.
- Mixed-Voltage Systems: Suitable for systems that require communication between components operating at different voltage levels.
Q & A
- What is the primary function of the PCA9517DGKRG4?
The primary function of the PCA9517DGKRG4 is to act as an I²C/SMBus buffer/repeater, extending the distance of I²C bus signals and allowing for level translation between different voltage levels.
- What are the supported voltage levels for the PCA9517DGKRG4?
The device supports voltage levels of 1.8V, 2.5V, 3.3V, and 5V.
- What is the maximum data rate supported by the PCA9517DGKRG4?
The maximum data rate supported is 400 kHz.
- Is the PCA9517DGKRG4 overvoltage tolerant?
Yes, all inputs and I/Os are overvoltage tolerant up to 5.5V, even when the device is unpowered.
- Can multiple PCA9517DGKRG4 devices be connected in series?
Yes, multiple devices can be connected in series without accumulating offset voltage, only considering time-of-flight delays.
- What is the operating temperature range of the PCA9517DGKRG4?
The operating temperature range is -40°C to 85°C.
- What package types are available for the PCA9517DGKRG4?
The device is available in 8-TSSOP and 8-MSOP packages.
- Does the PCA9517DGKRG4 support clock stretching and arbitration across the repeater?
No, the PCA9517DGKRG4 does not support clock stretching and arbitration across the repeater.
- How is the enable input configured on the PCA9517DGKRG4?
The device features an active-high enable (EN) input with an internal pullup resistor.
- Is the PCA9517DGKRG4 RoHS compliant?
Yes, the PCA9517DGKRG4 is RoHS compliant.
