Overview
The PCA9555DWR, produced by Texas Instruments, is a 16-bit I2C and SMBus I/O expander designed to provide general-purpose remote I/O expansion for microcontrollers. This device operates within a voltage range of 2.3 V to 5.5 V, making it versatile for various applications. It features a low standby current consumption of 1 μA maximum, which is beneficial for power-sensitive designs. The PCA9555DWR is packaged in a 24-pin SOIC (Small Outline Integrated Circuit) package, offering a compact solution for I/O expansion needs.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Operating Voltage Range | Supply voltage range | 2.3 V to 5.5 V |
| Number of I/O Pins | Total number of I/O pins available | 16 |
| I2C Clock Frequency | Maximum clock frequency for I2C interface | 0 Hz to 400 kHz |
| Standby Current | Maximum current consumption in standby mode | 1 μA |
| Interrupt Output | Type of interrupt output | Open-drain active-low |
| Package Type | Package type and pin count | 24-pin SOIC |
| ESD Protection | Electrostatic discharge protection levels | 2000 V HBM, 200 V MM, 1000 V CDM |
| Operating Temperature Range | Temperature range for operation | -40°C to 85°C |
Key Features
- Low Standby Current: Maximum standby current consumption of 1 μA.
- I2C and SMBus Compatibility: Supports both I2C and SMBus protocols.
- 5 V Tolerant I/Os: I/O pins are tolerant up to 5 V.
- Polarity Inversion Register: Allows for polarity inversion of the input port register.
- Active-Low Interrupt Output: Open-drain interrupt output activated when any input state differs from its corresponding input port register state.
- Noise Filter on SCL/SDA Inputs: Reduces noise on the I2C bus lines.
- Internal Power-On Reset: Initializes the device to its default state upon power-up.
- Individual I/O Configuration: Each I/O pin can be configured as either an input or an output.
Applications
- Routers and Telecom Switching Equipment: For expanding GPIO in network devices.
- Personal Computers and Personal Electronics: Enhancing I/O capabilities in consumer electronics.
- Industrial Automation Equipment: Providing additional I/O for control and monitoring systems.
- Products with GPIO-Limited Processors: Expanding the I/O capabilities of microcontrollers with limited GPIO pins.
- ACPI Power Switches, Sensors, Push Buttons, LEDs, Fans: General-purpose I/O expansion for various peripherals.
Q & A
- What is the operating voltage range of the PCA9555DWR?
The PCA9555DWR operates within a voltage range of 2.3 V to 5.5 V.
- How many I/O pins does the PCA9555DWR provide?
The PCA9555DWR provides 16 I/O pins.
- What is the maximum I2C clock frequency supported by the PCA9555DWR?
The maximum I2C clock frequency is 400 kHz.
- What is the standby current consumption of the PCA9555DWR?
The maximum standby current consumption is 1 μA.
- What type of interrupt output does the PCA9555DWR have?
The PCA9555DWR has an open-drain active-low interrupt output.
- What is the package type and pin count of the PCA9555DWR?
The PCA9555DWR is packaged in a 24-pin SOIC.
- What are the ESD protection levels for the PCA9555DWR?
The PCA9555DWR has ESD protection levels of 2000 V HBM, 200 V MM, and 1000 V CDM.
- What is the operating temperature range for the PCA9555DWR?
The operating temperature range is -40°C to 85°C.
- Can the I/O pins of the PCA9555DWR be configured individually?
Yes, each I/O pin can be configured as either an input or an output.
- Does the PCA9555DWR have internal power-on reset functionality?
Yes, the PCA9555DWR has an internal power-on reset that initializes the device to its default state upon power-up.
