Overview
The PCA9517AD,112 is a CMOS integrated circuit designed by NXP Semiconductors, specifically tailored for level shifting and buffering in I²C-bus and SMBus applications. This device enables voltage level translation between low voltage (as low as 0.9 V) and higher voltage (2.7 V to 5.5 V) systems, making it versatile for various embedded and industrial environments. It is part of the PCA9517 family, known for its bidirectional buffering capabilities and support for extending the I²C-bus by isolating capacitance and voltage levels.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC(B) supply voltage (port B) | 2.7 | 5.5 | V | ||
| VCC(A) supply voltage (port A) | 0.9 | 5.5 | V | ||
| ICC(VCC(A)) supply current on pin VCC(A) | 1 | mA | |||
| ICCH HIGH-level supply current both channels HIGH | VCC = 5.5 V; SDAn = SCLn = VCC | 1.5 | 5 | mA | |
| ILI input leakage current | VI = 3.6 V | ±1 | μA | ||
| IIL LOW-level input current | SDA, SCL; VI = 0.2 V | 10 | μA | ||
| VOL LOW-level output voltage | IOL = 6 mA | 0.1 | 0.2 | V | |
| ILOH HIGH-level output leakage current | VO = 3.6 V | 10 | μA | ||
| Cio input/output capacitance | VI = 3 V or 0 V; VCC = 3.3 V | 6 | 7 | pF |
Key Features
- Bidirectional buffering for both data (SDA) and clock (SCL) lines, allowing for the extension of the I²C-bus and isolation of capacitance and voltage levels.
- Level shifting between low voltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) I²C-bus or SMBus applications.
- Supports up to 400 pF on either side of the device.
- Footprint and functional replacement for PCA9515/15A.
- I²C-bus and SMBus compatible.
- Active HIGH repeater enable input.
- Open-drain input/outputs.
- Lock-up free operation.
- Supports arbitration and clock stretching across the repeater.
Applications
The PCA9517AD,112 is suitable for a variety of applications where level shifting and buffering of I²C-bus signals are required. These include:
- Embedded systems requiring communication between different voltage domains.
- Industrial control systems where signal integrity and isolation are critical.
- Automotive systems that need robust and reliable I²C-bus communication.
- Consumer electronics where multiple voltage levels are used within the same system.
- Medical devices that require precise and reliable communication between different components.
Q & A
- What is the primary function of the PCA9517AD,112?
The primary function is to provide level shifting and bidirectional buffering for I²C-bus and SMBus signals between different voltage levels. - What are the supported voltage ranges for the PCA9517AD,112?
The device supports voltage level translation from 0.9 V to 5.5 V and from 2.7 V to 5.5 V. - Can the PCA9517AD,112 be used to extend the I²C-bus?
Yes, it can extend the I²C-bus by providing bidirectional buffering and isolating capacitance and voltage levels. - Is the PCA9517AD,112 compatible with SMBus?
Yes, it is compatible with both I²C-bus and SMBus protocols. - What is the maximum capacitance supported on either side of the device?
The device supports up to 400 pF on either side. - How do I enable or disable the drivers on the PCA9517AD,112?
The drivers can be enabled or disabled using the EN pin, but this should only be done when the bus is idle. - Can multiple PCA9517AD,112 devices be connected in series?
Yes, multiple devices can be connected in series (port A to port B) without any build-up in offset voltage. - What is the package type for the PCA9517AD,112?
The device is available in an 8-pin SOIC package. - Is the PCA9517AD,112 suitable for automotive applications?
Yes, it is suitable for automotive systems due to its robust and reliable operation. - What are the operating temperature ranges for the PCA9517AD,112?
The device operates within a temperature range of -40°C to +85°C.
