PCA9555DBQR

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9555DBQR is a 16-bit I2C-bus and SMBus I/O expander optimized for dimming LEDs in applications such as backlight control, keypad illumination, and other similar lighting functions. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C-bus interface.

Characteristics: - 16-bit remote bidirectional I/O port - Low standby current consumption of 1 µA - Operating voltage range: 2.3 V to 5.5 V - Compatible with I2C-bus and SMBus interfaces - Internal power-on reset - Noise filter on SCL/SDA inputs - Polarity inversion register - Active-low interrupt output - ESD protection exceeds JESD 22, 2000-V human-body model (A114-A) - Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

Package: SSOP (Shrink Small Outline Package)

Essence: The PCA9555DBQR is an essential component for controlling LED brightness and providing additional I/O ports for microcontrollers through the I2C-bus interface.

Packaging/Quantity: The PCA9555DBQR is available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.3 V to 5.5 V
• Input/Output Voltage Range: GND to VDD
• Input/Output Current: ±10 mA
• Standby Current: 1 µA
• Operating Temperature Range: -40°C to +85°C
• Package Type: SSOP-24

Detailed Pin Configuration

The PCA9555DBQR has a total of 24 pins. The pin configuration is as follows:

1. SDA (Serial Data)
2. SCL (Serial Clock)
3. INT (Interrupt Output) 4-7. P0-P3 (I/O Port 0-3) 8-15. P4-P11 (I/O Port 4-11)
4. VDD (Supply Voltage)
5. GND (Ground)
6. A0 (Address Input)
7. A1 (Address Input)
8. A2 (Address Input)
9. OE (Output Enable)
10. RESET (Reset Input)
11. NC (No Connection)
12. NC (No Connection)

Functional Features

The PCA9555DBQR offers the following functional features: - Bidirectional I/O expansion through the I2C-bus/SMBus interface - Individual direction control for each I/O pin - Internal power-on reset - Noise filter on inputs to reduce false triggering - Programmable polarity inversion register - Active-low interrupt output for efficient event notification

Advantages and Disadvantages

Advantages: - Low standby current consumption - Wide operating voltage range - Compatibility with I2C-bus and SMBus interfaces - ESD protection exceeding industry standards - Latch-up testing exceeding 100 mA

Disadvantages: - Limited number of I/O ports (16-bit)

Working Principles

The PCA9555DBQR operates by receiving commands from a microcontroller via the I2C-bus interface. It can be used to control LED brightness levels by adjusting the duty cycle of the PWM signal. The bidirectional I/O ports allow for communication between the microcontroller and external devices.

Detailed Application Field Plans

The PCA9555DBQR finds applications in various fields, including: - Backlight control in LCD displays - Keypad illumination in consumer electronics - LED dimming in automotive applications - Industrial automation for controlling external devices

Detailed and Complete Alternative Models

1. PCA9555PW, offered in TSSOP-24 package
2. PCA9555D, offered in SOIC-24 package
3. PCA9555RGYR, offered in VQFN-24 package
4. PCA9555BS, offered in SSOP-24 package

These alternative models provide similar functionality to the PCA9555DBQR and can be used as replacements depending on specific requirements.

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