Overview
The PCA9557BS,118 is a silicon CMOS circuit designed by NXP USA Inc. to provide parallel input/output expansion for SMBus and I²C-bus applications. This 8-bit I/O port expander is particularly useful in systems where additional I/O lines are needed. It features low current consumption and high-impedance open-drain output pins, making it versatile for various embedded systems and microcontroller projects.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| VDD Supply Voltage | 2.3 V to 5.5 V | |
| Input Voltage (VI) | -0.5 V to 5.5 V | |
| Output Current (IO) | -50 mA to 50 mA | Per pin |
| Supply Current (IDD) | 85 mA | |
| Ground Supply Current (ISS) | 100 mA | |
| Total Power Dissipation (Ptot) | 200 mW | |
| Storage Temperature (Tstg) | -65°C to 150°C | |
| Ambient Temperature (Tamb) | -40°C to 85°C | |
| Package Type | 16-VQFN Exposed Pad Surface Mount |
Key Features
- 8-bit input port register and 8-bit output port register
- I²C-bus/SMBus interface
- Low current consumption
- High-impedance open-drain output pin (IO0)
- Configurable I/O as either input or output
- Polarity inversion register for input signals
- Reset feature via RESET pin or power-on reset
- Protection diodes on input/output pins (IO1 to IO7)
Applications
The PCA9557BS,118 is suitable for a variety of applications, including:
- Embedded systems requiring additional I/O lines
- Microcontroller projects needing I²C-bus or SMBus expansion
- Automotive and industrial control systems
- Consumer electronics and appliances
- Medical devices and diagnostic equipment
Q & A
- What is the PCA9557BS,118 used for?
The PCA9557BS,118 is used for parallel input/output expansion in SMBus and I²C-bus applications. - What is the voltage range for the VDD supply?
The VDD supply voltage ranges from 2.3 V to 5.5 V. - What is the maximum output current per pin?
The maximum output current per pin is 50 mA. - How can the I/O configuration be changed?
The system master can change the I/O configuration by writing to the configuration register. - What is the purpose of the RESET pin?
The RESET pin is used to reset the device, putting the registers in their default state and initializing the I²C-bus/SMBus state machine. - What is the package type of the PCA9557BS,118?
The package type is 16-VQFN Exposed Pad Surface Mount. - What are the storage and ambient temperature ranges?
The storage temperature range is -65°C to 150°C, and the ambient temperature range is -40°C to 85°C. - Can the input signals be inverted?
Yes, the input signals can be inverted by writing to the active HIGH polarity inversion register. - What is the total power dissipation of the device?
The total power dissipation is 200 mW. - Is the PCA9557BS,118 RoHS compliant?
Yes, the PCA9557BS,118 is lead-free and RoHS compliant.
