NXP USA Inc. PCA9509DP/DG,118

The PCA9509DP/DG,118, produced by NXP USA Inc., is a level-translating I²C-bus/SMBus repeater. This component is designed to enable the interface between a low-voltage 2-wire serial bus of a processor and a standard I²C-bus or SMBus. It supports voltage translation down to as low as 1.35 V on the processor side without compromising system performance. The PCA9509DP/DG,118 is particularly useful in systems where different voltage levels need to be bridged efficiently.

• Level Translation: Enables voltage translation between the processor's low-voltage 2-wire serial bus and a standard I²C-bus or SMBus, supporting voltages as low as 1.35 V on the processor side.
• Bidirectional Open-Drain Buffers: Contains two bidirectional open-drain buffers designed for up-translation and down-translation.
• Over-Voltage Tolerance: Port B I/Os are over-voltage tolerant up to 5.5 V, even when the device is unpowered.
• Power-Up Circuitry: Includes a power-up circuit that keeps the output drivers turned off until V_CC(B) is above 2.5 V and V_CC(A) continues to rise.
• Ground Offset Protection: Ensures that ground offset between the PCA9509 and other devices on port A is minimized to avoid signal degradation).

The PCA9509DP/DG,118 is suitable for various applications where voltage level translation between different parts of a system is necessary. These include:

• Embedded Systems: In systems where processors operate at lower voltages and need to communicate with peripherals or other components operating at higher voltages.
• Industrial Automation: For interfacing low-voltage microcontrollers with higher voltage I²C or SMBus devices in industrial automation environments.
• Consumer Electronics: In consumer electronics where different components may operate at different voltage levels, such as in smartphones, tablets, and other portable devices.
• Automotive Systems: For ensuring reliable communication between different modules in automotive systems that may operate at various voltage levels.

1. What is the primary function of the PCA9509DP/DG,118?

   The primary function is to act as a level-translating I²C-bus/SMBus repeater, enabling communication between low-voltage and standard voltage I²C or SMBus systems.

2. What is the minimum voltage supported on the processor side?

   The minimum voltage supported on the processor side (Port A) is 1.35 V).

3. What is the over-voltage tolerance of Port B I/Os?

   Port B I/Os are tolerant up to 5.5 V, even when the device is unpowered).

4. How does the power-up circuitry work?

   The power-up circuit keeps the output drivers turned off until V_CC(B) is above 2.5 V and V_CC(A) continues to rise).

5. Why is ground offset protection important?

   Ground offset protection is crucial to avoid signal degradation and ensure proper communication between devices on Port A).

6. What are the typical applications of the PCA9509DP/DG,118?

   Typical applications include embedded systems, industrial automation, consumer electronics, and automotive systems).

7. How many bidirectional open-drain buffers does the PCA9509DP/DG,118 contain?

   The PCA9509DP/DG,118 contains two bidirectional open-drain buffers).

8. What is the maximum ground offset allowed between the PCA9509 and other devices on Port A?

   The maximum ground offset should not exceed 50 mV).

9. What is the package type of the PCA9509DP/DG,118?

   The package type is 8-TSSOP (Thin Shrink Small Outline Package)).

10. Where can I find detailed specifications for the PCA9509DP/DG,118?

    Detailed specifications can be found in the official NXP Semiconductors datasheet and on supplier websites like Digi-Key and Mouser).