PCA9535DBG4

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9535DBG4 is a 16-bit I2C-bus and SMBus I/O expander optimized for dimming LEDs in applications such as backlight control, keypad illumination, and general-purpose input/output expansion.

Characteristics: - 16-bit remote bidirectional I/O port - Low standby current consumption of 1 µA (max) - 400 kHz Fast-mode I2C-bus interface - Schmitt trigger inputs for noise suppression - Internal power-on reset - No glitch on power-up - Supports hot insertion - Active LOW open-drain interrupt output - Polarity inversion register - 25 mA sink capability per I/O - ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101

Package: The PCA9535DBG4 is available in a 24-pin SSOP package.

Essence: This IC provides a simple solution for expanding the number of I/O ports in a system, especially when controlling LEDs or other devices that require dimming functionality.

Packaging/Quantity: The PCA9535DBG4 is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2.3 V to 5.5 V
• Input Voltage Range: GND to VDD
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: 0 Hz to 400 kHz

Detailed Pin Configuration

The PCA9535DBG4 has a total of 24 pins. The pin configuration is as follows:

Pin 1: SDA - Serial Data Input/Output Pin 2: SCL - Serial Clock Input Pin 3: A0 - Address Input Pin 4: A1 - Address Input Pin 5: A2 - Address Input Pin 6-21: P0-P15 - I/O Ports Pin 22: INT - Interrupt Output Pin 23: VDD - Supply Voltage Pin 24: GND - Ground

Functional Features

The PCA9535DBG4 offers the following functional features:

1. Bidirectional I/O Ports: The 16-bit remote bidirectional I/O port allows both input and output functionality for each pin.
2. Low Standby Current Consumption: With a maximum standby current consumption of 1 µA, the IC ensures minimal power usage when not actively controlling the I/O ports.
3. Fast-mode I2C-bus Interface: The IC supports communication speeds up to 400 kHz, enabling efficient data transfer between the device and the microcontroller.
4. Schmitt Trigger Inputs: The Schmitt trigger inputs help suppress noise and ensure reliable signal detection.
5. Power-On Reset: The internal power-on reset feature ensures proper initialization of the IC upon power-up.
6. Hot Insertion Support: The IC supports hot insertion, allowing it to be connected or disconnected from the system without causing any glitches or disruptions.
7. Interrupt Output: The active LOW open-drain interrupt output provides a signal to the microcontroller when an interrupt condition occurs.
8. Polarity Inversion Register: The polarity inversion register allows the user to invert the logic state of the I/O ports.
9. High Sink Capability: Each I/O port can sink up to 25 mA, making it suitable for driving LEDs or other devices that require higher current levels.
10. ESD Protection: The IC provides robust ESD protection, exceeding 2000 V HBM and 1000 V CDM standards.

Advantages and Disadvantages

Advantages: - Simplifies I/O expansion in systems with limited available pins. - Supports dimming functionality for LEDs, making it suitable for various lighting applications. - Low standby current consumption minimizes power usage. - Fast-mode I2C-bus interface enables efficient communication. - Schmitt trigger inputs ensure reliable signal detection. - Hot insertion support allows for easy integration into existing systems. - High sink capability per I/O port enables driving of devices requiring higher current levels. - Robust ESD protection ensures device reliability.

Disadvantages: - Limited to 16-bit I/O ports, which may not be sufficient for certain applications requiring a larger number of I/Os. - Requires an external microcontroller or host device for control and communication.

Working Principles

The PCA9535DBG4 operates as an I2C-bus and SMBus I/O expander. It communicates with a microcontroller or host device through the I2C-bus interface, allowing the user to control and monitor the state of the 16 bidirectional I/O ports.

By sending appropriate commands and data over the I2C-bus, the micro