PCA9554DWR

Product Overview

Category

PCA9554DWR belongs to the category of integrated circuits (ICs).

Use

The PCA9554DWR is a 8-bit I2C-bus and SMBus I/O expander. It provides remote I/O expansion for most microcontroller families via the I2C-bus interface.

Characteristics

• 8-bit remote I/O port with interrupt and reset
• Low standby current consumption of 1 µA
• Compatible with I2C-bus and SMBus interfaces
• Internal power-on reset
• Noise filter on SCL/SDA inputs
• Latched outputs with high-current drive capability for directly driving LEDs
• Active-low interrupt output
• Address by three hardware address pins for use of up to eight devices
• Polarity inversion register to configure the polarity of the input port data
• No glitch on power-up
• Supports hot insertion
• Low standby current
• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101

Package

PCA9554DWR is available in a small outline package (SO) with a width of 3.9 mm and a length of 4.9 mm.

Essence

The essence of PCA9554DWR lies in its ability to provide remote I/O expansion for microcontrollers through the I2C-bus interface. It allows for easy integration of additional I/O ports without requiring extensive wiring or complex circuitry.

Packaging/Quantity

PCA9554DWR is typically sold in reels, with each reel containing 2500 units.

Specifications

• Supply voltage: 2.3 V to 5.5 V
• Input voltage range: 0 V to VDD
• Output voltage range: 0 V to VDD
• Operating temperature range: -40°C to +85°C
• I2C-bus frequency: 100 kHz, 400 kHz, and 1 MHz

Detailed Pin Configuration

The PCA9554DWR has a total of 16 pins. The pin configuration is as follows:

1. A0: Hardware address pin 0
2. A1: Hardware address pin 1
3. A2: Hardware address pin 2
4. P0: I/O port 0
5. P1: I/O port 1
6. P2: I/O port 2
7. P3: I/O port 3
8. P4: I/O port 4
9. P5: I/O port 5
10. P6: I/O port 6
11. P7: I/O port 7
12. INT: Interrupt output
13. SDA: Serial data line
14. SCL: Serial clock line
15. GND: Ground
16. VDD: Supply voltage

Functional Features

Remote I/O Expansion

PCA9554DWR allows for remote I/O expansion by providing additional I/O ports through the I2C-bus interface. This enables the connection of multiple devices to a microcontroller without the need for extensive wiring.

Interrupt Output

The device features an active-low interrupt output (INT) that can be used to signal the microcontroller when a specific event occurs on one of the I/O ports.

Polarity Inversion Register

PCA9554DWR includes a polarity inversion register that allows the user to configure the polarity of the input port data. This feature provides flexibility in handling different input signal polarities.

High-Current Drive Capability

The latched outputs of PCA9554DWR have a high-current drive capability, making it suitable for directly driving LEDs or other devices that require higher current levels.

Advantages and Disadvantages

Advantages

• Easy integration of additional I/O ports
• Low standby current consumption
• Compatibility with I2C-bus and SMBus interfaces
• Polarity inversion register for flexible input signal handling
• High-current drive capability for directly driving LEDs

Disadvantages

• Limited number of I/O ports (8-bit)

Working Principles

PCA9554DWR communicates with the microcontroller through the I2C-bus interface. The microcontroller sends commands and data to the device, which in turn controls the I/O ports accordingly. The device can also generate interrupts to notify the microcontroller of specific events on the I/O ports.

Detailed Application Field Plans

PCA9554DWR finds applications in various fields where remote I/O expansion is required. Some potential application areas include: - Home automation systems - Industrial control systems - Automotive electronics - Internet of Things (IoT) devices - Robotics

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