Overview
The PCA9507D, produced by NXP USA Inc., is a 2-wire serial bus extender designed to extend the reach of I²C-bus, SMBus, and HDMI DDC signals. This device allows for reliable bus extension up to 18 meters, facilitating the connection of devices over longer distances without compromising signal integrity. It provides level shifting between 3.3 V and 5 V, ensuring compatibility with a wide range of systems. The PCA9507D retains all operating modes and features of the I²C-bus system during level shifts, making it an essential component for various applications requiring extended bus lengths.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC(A) supply voltage | 2.7 | 5.5 | V | ||
| VCC(B) supply voltage | 2.7 | 5.5 | V | ||
| ICC(VCC(A)) supply current | 1 | mA | |||
| ICCH(B) port B HIGH-level supply current | VCC = 5.5 V; SDAn = SCLn = VCC | 1.5 | 5 | mA | |
| ICCL(B) port B LOW-level supply current | 1.5 | mA | |||
| 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 | |
| Cio input/output capacitance | VI = 3 V or 0 V; VCC = 3.3 V | 7 | pF | ||
| Itrt(pu) transient boosted pull-up current | VCC(A) = 4.5 V; slew rate = 1.25 V/µs | 6 | mA |
Key Features
- Bus Extension: Extends I²C-bus, SMBus, and HDMI DDC signals up to 18 meters.
- Level Shifting: Supports level shifting between 3.3 V and 5 V.
- Bidirectional Buffering: Provides bidirectional buffering for both data (SDA) and clock (SCL) lines.
- Rise Time Accelerator: Includes a rise time accelerator on port A to drive heavier capacitive loads.
- Overvoltage Tolerance: All I/Os are overvoltage tolerant to 5.5 V even when the device is unpowered.
- Power-Up Circuitry: Keeps output drivers turned off until VCC(A) and VCC(B) rise above 2.7 V.
- Enable Pin Control: The EN pin can be used to turn the drivers on and off under system control.
Applications
- HDMI DDC: Extends HDMI DDC signals to meet distance specifications of HDMI DDC version 1.3.
- I²C-bus and SMBus Systems: Suitable for extending I²C-bus and SMBus signals in various applications.
- Industrial and Automotive Systems: Used in systems requiring reliable signal transmission over long distances.
- Consumer Electronics: Applied in consumer electronics where extended bus lengths are necessary.
Q & A
- What is the primary function of the PCA9507D?
The PCA9507D is a 2-wire serial bus extender designed to extend I²C-bus, SMBus, and HDMI DDC signals up to 18 meters. - What voltage levels does the PCA9507D support?
The PCA9507D supports level shifting between 3.3 V and 5 V. - What is the purpose of the rise time accelerator on port A?
The rise time accelerator on port A enables the device to drive a long cable or a heavier capacitive load. - How does the PCA9507D handle overvoltage conditions?
All I/Os are overvoltage tolerant to 5.5 V even when the device is unpowered. - Can multiple PCA9507Ds be connected in series?
Yes, multiple PCA9507Ds can be connected in series, port A to port B, with no build-up in offset voltage. - What is the role of the EN pin in the PCA9507D?
The EN pin can be used to turn the drivers on and off under system control. - What are the typical applications of the PCA9507D?
The PCA9507D is used in HDMI DDC, I²C-bus, SMBus systems, industrial and automotive systems, and consumer electronics. - What is the maximum supply current on VCC(A)?
The maximum supply current on VCC(A) is 1 mA. - How does the PCA9507D handle power-up?
The PCA9507D keeps output drivers turned off until VCC(A) and VCC(B) rise above 2.7 V. - Is the PCA9507D compliant with environmental regulations?
Yes, the PCA9507D is PbFree, EU RoHS compliant, and Halogen Free.
