Overview
The PCA9557PW,112 is a silicon CMOS circuit designed by NXP USA Inc. to provide parallel input/output expansion for SMBus and I²C-bus applications. This device is part of NXP's extensive family of I²C-bus I/O expanders, enhancing the capabilities of microcontrollers by adding additional GPIO ports.
Key Specifications
| Parameter | Description |
|---|---|
| Number of I/O Bits | 8 bits |
| Interface | I²C-bus/SMBus |
| Operating Power-Supply Voltage | 2.3 V to 5.5 V |
| I²C Bus Speed | Up to 400 kHz |
| Addressing | Three hardware address pins (A0, A1, A2) allowing up to eight devices on the same I²C/SMBus |
| Reset | Active-low reset input, internal power-on reset |
| Package | TSSOP (PW), SSOP (DB), VQFN (RGY), and others |
| Standby Current Consumption | 1 μA max |
| I/O Port Configuration | Configurable as inputs or outputs, polarity inversion capability |
Key Features
- Provides 8 bits of general-purpose parallel input/output expansion for I²C-bus/SMBus applications.
- Operating power-supply voltage range of 2.3 V to 5.5 V.
- 400 kHz fast I²C bus speed.
- Three hardware address pins allowing up to eight devices on the same I²C/SMBus.
- Active-low reset input and internal power-on reset.
- High-impedance open-drain outputs with high-current drive capability for directly driving LEDs.
- No glitch on power up and noise filter on SCL/SDA inputs.
- Low standby current consumption of 1 μA max.
- Configurable I/O ports with polarity inversion capability.
Applications
- Microcontroller systems requiring additional GPIO ports.
- Industrial control systems.
- Automotive systems.
- Consumer electronics.
- Medical devices.
- Any application requiring I²C-bus/SMBus interface expansion.
Q & A
- What is the PCA9557PW,112 used for?
The PCA9557PW,112 is used to provide 8 bits of general-purpose parallel input/output expansion for I²C-bus/SMBus applications.
- What is the operating voltage range of the PCA9557PW,112?
The operating voltage range is from 2.3 V to 5.5 V.
- How many devices can be connected on the same I²C/SMBus using the PCA9557PW,112?
Up to eight devices can be connected using the three hardware address pins (A0, A1, A2).
- What is the maximum I²C bus speed supported by the PCA9557PW,112?
The maximum I²C bus speed supported is 400 kHz.
- Does the PCA9557PW,112 have a reset feature?
Yes, it has an active-low reset input and an internal power-on reset.
- Can the I/O ports of the PCA9557PW,112 be configured?
Yes, the I/O ports can be configured as inputs or outputs with polarity inversion capability.
- What is the standby current consumption of the PCA9557PW,112?
The standby current consumption is 1 μA max.
- Can the PCA9557PW,112 drive LEDs directly?
Yes, the high-impedance open-drain outputs have high-current drive capability for directly driving LEDs.
- Are there any noise filters on the SCL/SDA inputs of the PCA9557PW,112?
Yes, there are noise filters on the SCL/SDA inputs.
- What are some common applications of the PCA9557PW,112?
Common applications include microcontroller systems, industrial control systems, automotive systems, consumer electronics, and medical devices.
