Overview
The PCA9509ADP,118 from NXP USA Inc. is a low power level translating I2C-bus/SMBus repeater designed to enable communication between low-voltage and standard-voltage I2C or SMBus systems. This device supports bidirectional buffering for both the data (SDA) and clock (SCL) lines, allowing for the extension of the I2C-bus or SMBus while maintaining all operating modes and features during level shifts. It is particularly useful in systems where different voltage levels need to be interfaced, such as in embedded systems, industrial control, and consumer electronics.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC(A) supply voltage (Port A) | 0.8 | 2.0 | V | ||
| VCC(B) supply voltage (Port B) | 2.3 | 5.5 | V | ||
| Operating Temperature | -40 | 85 | °C | ||
| Maximum Data Rate | 400 | kHz | |||
| Input Capacitance | VI = 3.0 V | 2 | 3 | pF | |
| Supply Current (ICC(A)) | VCC(A) = 1.1 V, VCC(B) = 3.3 V | < 1.9 | mA | ||
| Standby Current | EN = LOW | < 10 | μA | ||
| Package Type | 8-TSSOP, 8-XQFN |
Key Features
- Level Translation: Enables communication between low-voltage (0.8 V to 2.0 V) and standard-voltage (2.3 V to 5.5 V) I2C or SMBus systems.
- Bidirectional Buffering: Provides buffering for both SDA and SCL lines, allowing for I2C-bus or SMBus extension.
- Internal Current Source: Port A uses an internal current source for pull-up, eliminating the need for external pull-up resistors.
- Overvoltage Tolerance: Both port A and port B are overvoltage tolerant up to 5.5 V.
- Low Power Consumption: Low operating and standby current consumption.
- Edge Rate Control: Includes circuitry to slow down the falling edge of output pull-downs, reducing system noise and undershoot.
- High-Impedance When Unpowered: SDA and SCL pins are high-impedance when the device is unpowered.
Applications
- Embedded Systems: Ideal for interfacing different voltage levels in embedded systems.
- Industrial Control: Used in industrial control systems where voltage level translation is necessary.
- Consumer Electronics: Suitable for consumer electronics requiring I2C or SMBus communication across different voltage domains.
- Automotive Systems: Can be used in automotive systems where robust and reliable communication is required.
Q & A
- What is the primary function of the PCA9509ADP,118?
The PCA9509ADP,118 is a level translating I2C-bus/SMBus repeater that enables communication between low-voltage and standard-voltage I2C or SMBus systems.
- What are the voltage ranges for Port A and Port B?
Port A operates from 0.8 V to 2.0 V, and Port B operates from 2.3 V to 5.5 V.
- Does the PCA9509ADP,118 require external pull-up resistors for Port A?
No, Port A uses an internal current source for pull-up, eliminating the need for external pull-up resistors.
- What is the maximum data rate supported by the PCA9509ADP,118?
The device supports a maximum data rate of 400 kHz.
- Is the PCA9509ADP,118 overvoltage tolerant?
Yes, both Port A and Port B are overvoltage tolerant up to 5.5 V.
- What are the package types available for the PCA9509ADP,118?
The device is available in 8-TSSOP and 8-XQFN packages.
- How does the PCA9509ADP,118 manage edge rates to reduce system noise?
The device includes circuitry to slow down the falling edge of output pull-downs, reducing system noise and undershoot.
- What happens to the SDA and SCL pins when the device is unpowered?
The SDA and SCL pins are high-impedance when the device is unpowered.
- What are some typical applications for the PCA9509ADP,118?
Typical applications include embedded systems, industrial control, consumer electronics, and automotive systems.
- What is the operating temperature range for the PCA9509ADP,118?
The operating temperature range is from -40°C to +85°C.
