Overview
The PCA9515ADGKT, produced by Texas Instruments, is a dual bidirectional I2C bus and SMBus repeater designed to extend and isolate I2C and SMBus systems. This BiCMOS integrated circuit is intended to support standard and fast mode I2C devices, as well as multiple masters, without degrading system performance. It allows for the connection of two buses with up to 400-pF bus capacitance, making it suitable for applications requiring longer trace lengths or more devices on the bus.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Operating Supply Voltage (VCC) | 2.3 | - | 3.6 | V |
| Propagation Delay Time (tPLZ, tPZL) | 33 | 82-113 | 190 | ns |
| Output Transition Time (ttHL, ttLH) | 57 | 80-148 | 180 | ns |
| ESD Protection | - | - | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model | - |
| Latch-Up Performance | - | - | 100 mA Per JESD 78, Class II | - |
| Package Type | - | - | VSSOP-8 | - |
Key Features
- I2C Bus and SMBus Compatibility: Supports standard and fast mode I2C devices and multiple masters.
- Lockup-Free Operation: Ensures that the I2C bus does not hang during operations.
- Mixed-Mode Signal Operation: Allows for operation with different voltage levels on each side of the repeater.
- 5.5-V Tolerant I2C I/O and Enable Input: No additional circuitry needed for voltage translation between different bus voltages.
- Powered-Off High-Impedance I2C Pins: Reduces power consumption when the device is powered off.
- ESD Protection: Exceeds JESD 22 standards for human-body, machine, and charged-device models.
- Latch-Up Performance: Exceeds 100 mA per JESD 78, Class II.
Applications
- Extending I2C Bus Lengths: Suitable for applications requiring longer trace lengths or more devices on the bus.
- Isolating Bus Segments: Can isolate two halves of a bus to accommodate different voltage levels or to manage capacitance.
- Mixed-Voltage Systems: Supports mixed-mode signal operation, allowing different voltage levels on each side of the repeater.
- Industrial and Automotive Systems: Used in various industrial and automotive applications where reliable I2C communication is critical.
Q & A
- What is the primary function of the PCA9515ADGKT?
The PCA9515ADGKT is a dual bidirectional I2C bus and SMBus repeater designed to extend and isolate I2C and SMBus systems.
- What are the operating voltage ranges for the PCA9515ADGKT?
The device operates within a supply voltage range of 2.3 V to 3.6 V.
- Does the PCA9515ADGKT support mixed-mode signal operation?
Yes, it supports mixed-mode signal operation, allowing different voltage levels on each side of the repeater.
- What is the maximum bus capacitance supported by the PCA9515ADGKT?
The device can connect two buses with up to 400-pF bus capacitance.
- Is the PCA9515ADGKT protected against ESD?
Yes, it exceeds JESD 22 standards for human-body, machine, and charged-device models.
- Can the PCA9515ADGKT be used in series with another PCA9515ADGKT?
No, the design does not allow for using two or more PCA9515A devices in series.
- What package types are available for the PCA9515ADGKT?
The device is available in a VSSOP-8 package.
- Does the PCA9515ADGKT support clock stretching and arbitration?
Yes, it supports clock stretching and arbitration of the I2C bus.
- How does the PCA9515ADGKT handle power-up?
The device contains a power-up control circuit that sets an internal latch to prevent the output circuits from becoming active until VCC is at a valid level (VCC = 2.3 V).
- What are some common applications for the PCA9515ADGKT?
Common applications include extending I2C bus lengths, isolating bus segments, and use in mixed-voltage systems, particularly in industrial and automotive environments.
