PCA9557PW

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PCA9557PW

+Nomenclature

IC XPND 400KHZ I2C SMBUS 16TSSOP

  • FabricantTexas Instruments

  • Pièce fabricant #PCA9557PW

  • En stock2308

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Spécifications

Attribut Valeur
Part Status Obsolete
Base Product Number PCA9557
DigiKey Programmable Not Verified
Number of I/O 8
Interface I2C, SMBus
Interrupt Output No
Features POR
Output Type Open Drain, Push-Pull
Current - Output Source/Sink 10mA, 25mA
Clock Frequency 400 kHz
Voltage - Supply 2.3V ~ 5.5V
Operating Temperature -40°C ~ 85°C
Mounting Type Surface Mount
Package 16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package 16-TSSOP
Packaging Tube

Présentation

Description

The PCA9557PW is an I²C-bus controlled I/O port with 8-bit configuration, ideally suited for low power and low voltage applications. It acts as an I/O expander, increasing the number of I/O pins available in a system. The device operates as a peripheral to the microcontroller or processor, using the I²C communication protocol for interfacing. Each of the 8 I/O pins can be independently configured as an input or output, providing flexibility in interfacing with other devices like sensors or LEDs.
The PCA9557PW supports standard and fast I²C data transfer rates and features hardware address capability, allowing multiple devices to coexist on the same bus. It operates over a wide voltage range, making it adaptable to various power supply configurations. The device also supports interrupt functionality, which allows it to alert the microcontroller to changes in input pin states, enhancing the responsiveness of the system.
Packaged in a TSSOP (Thin Shrink Small Outline Package), the PCA9557PW is compact and suitable for space-constrained applications, contributing to its popularity in embedded systems.

Equivalent

The PCA9557PW is a GPIO expander with I2C interface. Equivalent products include:
1. PCF8574: An I2C GPIO expander with 8-bit port.
2. MCP23008: A Microchip part offering similar I2C GPIO expansion.
3. TCA9534: A Texas Instruments 8-bit I2C/SMBus GPIO expander.
4. MAX7328: A Maxim Integrated port expander with similar functionality.
Ensure compatibility by checking electrical characteristics, pin configurations, and feature sets before substituting.

Features

The PCA9557PW is an I2C-bus controlled I/O port with several key features. It offers 8-bit input/output port expansion for microcontrollers or microprocessors through the I2C bus interface. Each of the eight I/O pins can be configured individually as either input or output. This device is known for its low standby current consumption, making it energy efficient.
The PCA9557PW provides a wide operating voltage range, typically from 2.3 V to 5.5 V, which allows for flexibility in various applications. It features interrupt output for input change notification, and it supports a standard and fast-mode I2C-bus, with speeds up to 400 kHz, ensuring quick data communication.
Additionally, the PCA9557PW includes power-on reset circuitry and supports hot insertion, increasing its robustness and reliability. It is packaged in a small, space-efficient TSSOP package, making it suitable for compact designs. This device is commonly used in applications requiring additional I/O ports, such as in embedded systems, consumer electronics, and industrial controls.

Pinout

The PCA9557PW is an 8-bit I/O expander for the I²C-bus. It operates as a peripheral device to enable additional GPIO (General-Purpose Input/Output) pins for microcontrollers or microprocessors. The device has a small footprint with a 16-pin package.
Pin Count:
- 16 pins
Key Functions:
1. I²C Interface:
- Supports standard I²C communication with SDA (Serial Data) and SCL (Serial Clock) lines.
2. I/O Expansion:
- Provides 8-bit parallel input/output port.
- Can be used to control or monitor up to 8 separate devices (LEDs, buttons, etc.).
3. Power and Ground:
- VDD and VSS pins to supply power to the chip.
4. Addressing:
- Includes address pins A0, A1, and A2 for setting different I²C addresses, allowing for up to 8 devices on the same bus.
5. Interrupt Output:
- INT pin for interrupt output to alert the microcontroller about changes on the input pins.
The PCA9557PW is commonly used in applications requiring additional I/O ports or isolating I²C bus communication.

Manufacturer

The PCA9557PW is manufactured by NXP Semiconductors. NXP is a global semiconductor company that specializes in delivering secure connectivity solutions for embedded applications. Their product portfolio includes a wide range of semiconductor devices such as microcontrollers, microprocessors, sensors, RF components, and more. NXP is known for its innovations in automotive, industrial, and IoT applications, focusing on creating secure connections for a smarter world.

Application

The PCA9557PW is a general-purpose I/O expander commonly used in applications requiring additional I/O capabilities. It is often utilized in consumer electronics, industrial control systems, and embedded systems where microcontrollers need to control more I/O pins than are natively available. Key application areas include interfacing with sensors, driving LEDs, reading switches or buttons, and managing other peripheral devices in a compact form. Its features, like I2C communication, make it suitable for applications needing simple and efficient communication between microcontrollers and multiple peripherals. Additionally, it's useful in prototyping and development environments where flexible I/O expansion is necessary.

Package

The PCA9557PW is an I²C-bus controlled I/O port with a low-voltage and low-power CMOS technology. Its package type is TSSOP (Thin Shrink Small Outline Package) with typically 16 pins.

Frequently Asked Questions


Q: Does the PCA9557PW support interrupt output for event-driven applications?
A: No. This device does not feature an interrupt output. For interrupt-capable I/O expanders, consider TI's PCA9535 or PCA9555 series.


Q: What is the maximum clock frequency for I2C communication?
A: The PCA9557PW supports a standard I2C/SMBus clock frequency up to 400 kHz, compliant with Fast-mode operation.


Q: Can the I/O pins be configured as both input and output?
A: Yes. Each of the 8 I/O pins is individually configurable, and the output type supports open-drain or push-pull configuration.


Q: What is the current drive capability per I/O pin?
A: Each I/O can sink 25 mA or source 10 mA. This supports driving LEDs and small loads directly without external buffers.


Q: Is the PCA9557PW suitable for 3.3V and 5V systems?
A: Yes. It operates over a wide supply range of 2.3V to 5.5V, making it compatible with both 3.3V and 5V logic systems.


Q: Does the device have Power-On Reset (POR) functionality?
A: Yes. The POR feature ensures the I/O outputs are initialized to a known state upon power-up, preventing glitches.


Q: What is the operating temperature range for this component?
A: The PCA9557PW is rated for industrial temperature operation from -40°C to +85°C, suitable for harsh environments.


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