Overview
The PCA9557PWT, produced by Texas Instruments, is an 8-bit I2C and SMBus low-power I/O expander. This device is designed to provide general-purpose remote I/O expansion for most microcontroller families through the I2C interface. It operates within a power-supply voltage range of 2.3V to 5.5V and features low standby current consumption, making it suitable for a variety of applications where power efficiency is crucial.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of I/O | 8 | - |
| Interface | I2C, SMBus | - |
| Operating Voltage Range | 2.3V to 5.5V | V |
| Standby Current Consumption | 1 μA (max) | μA |
| Input/Output Configuration | Input or Output (configurable) | - |
| Reset Pin | Active Low | - |
| Package Type | 16-TSSOP (0.173", 4.40mm Width) | - |
| Operating Temperature Range | -40°C to 85°C | °C |
| Total Power Dissipation | 200 mW | mW |
Key Features
- Low standby current consumption of 1 μA maximum.
- I2C to parallel port expander.
- Operating power-supply voltage range of 2.3V to 5.5V.
- 8-bit configuration (input or output selection) with input port, output port, and polarity inversion registers.
- Power-on reset and external reset pin for initialization.
- High-impedance open-drain output pin (IO0).
- Support for both Standard and Fast I2C modes.
Applications
- Telecom shelters and filter units.
- Servers and routers (telecom switching equipment).
- Personal computers and personal electronics.
- Industrial automation.
- Products with GPIO-limited microcontrollers.
Q & A
- What is the PCA9557PWT used for?
The PCA9557PWT is used for providing general-purpose remote I/O expansion for most microcontroller families through the I2C interface. - What is the operating voltage range of the PCA9557PWT?
The operating voltage range is 2.3V to 5.5V. - How much standby current does the PCA9557PWT consume?
The PCA9557PWT consumes a maximum of 1 μA in standby mode. - What types of I2C modes does the PCA9557PWT support?
The PCA9557PWT supports both Standard and Fast I2C modes. - How is the reset function implemented in the PCA9557PWT?
The PCA9557PWT has both power-on reset and an external reset pin that can be used to initialize the device. - What is the maximum total power dissipation of the PCA9557PWT?
The maximum total power dissipation is 200 mW. - What is the operating temperature range of the PCA9557PWT?
The operating temperature range is -40°C to 85°C. - Can the polarity of the input port be inverted?
Yes, the polarity of the input port can be inverted using the polarity inversion register. - What is the package type of the PCA9557PWT?
The package type is 16-TSSOP (0.173", 4.40mm Width). - What are some common applications of the PCA9557PWT?
Common applications include telecom shelters, servers, routers, personal computers, personal electronics, and industrial automation.
