Texas Instruments TCA9539PWR

The TCA9539PWR, produced by Texas Instruments, is a 24-pin device that provides 16 bits of general-purpose parallel input and output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus protocol). This I/O expander operates with a power supply voltage range from 1.65 V to 5.5 V and supports both 100-kHz (I2C Standard mode) and 400-kHz (I2C Fast mode) clock frequencies. It is designed to expand the number of available I/O pins for microcontrollers, enabling more flexible and complex system designs without the need for additional microcontrollers or complex wiring.

• I2C to Parallel Port Expander: Bridges I2C communication protocol and parallel port interfaces.
• Low Standby-Current Consumption: Ensures minimal power consumption in standby mode, suitable for battery-powered applications.
• Open-Drain Active-Low Interrupt Output: Provides a flexible interrupt mechanism to signal events to the host microcontroller.
• Active-Low Reset Input: Allows the device to be reset to its default state.
• 5-V Tolerant I/O Ports: Compatible with a wide range of microcontrollers and devices.
• Compatible With Most Microcontrollers: Simplifies integration into existing systems.
• 400-kHz Fast I2C Bus: Supports high-speed communication.
• Input and Output Configuration Register: Allows configuring I/O ports as inputs or outputs.
• Polarity Inversion Register: Enables active-high or active-low operation.
• Internal Power-on Reset: Resets the device to its default state upon power-up.
• No Glitch on Power Up: Ensures stable operation during power-up.
• Noise Filter on SCL and SDA Inputs: Enhances signal integrity.
• Address by Two Hardware Address Pins: Allows up to four devices on the same I2C bus.
• Latched Outputs With High-Current Drive Capability: Directly drives LEDs and other high-current devices.
• ESD Protection: Exceeds JESD 22 standards.

The TCA9539PWR is versatile and can be used in a variety of applications, including:

• Industrial Automation: Expands I/O capabilities for industrial control systems.
• Consumer Electronics: Enhances the functionality of consumer devices by providing additional I/O ports.
• Automotive Systems: Suitable for automotive applications due to its robust features and wide operating temperature range.
• Sensors and Switches: Ideal for connecting sensors, switches, push-buttons, LEDs, and fans to microcontrollers.

1. What is the TCA9539PWR?
   The TCA9539PWR is a 16-bit I2C/SMBus I/O expander designed to provide additional general-purpose input and output (I/O) pins for microcontrollers and other digital devices.
2. What is the operating voltage range of the TCA9539PWR?
   The device operates with a power supply voltage range from 1.65 V to 5.5 V.
3. What are the supported I2C clock frequencies?
   The device supports both 100-kHz (I2C Standard mode) and 400-kHz (I2C Fast mode) clock frequencies.
4. Does the TCA9539PWR have interrupt capabilities?
   Yes, the device generates an interrupt on the INT pin whenever an input port changes state.
5. How many devices can be connected on the same I2C bus?
   Up to four TCA9539 devices can be connected on the same I2C bus using the A0 and A1 hardware address pins.
6. What is the purpose of the reset input on the TCA9539PWR?
   The reset input allows the device to be reset to its default state, ensuring proper application initialization.
7. Is the TCA9539PWR suitable for battery-powered applications?
   Yes, due to its low standby-current consumption, it is suitable for battery-powered applications.
8. What type of ESD protection does the TCA9539PWR have?
   The device has ESD protection exceeding JESD 22 standards, including 2000-V Human-Body Model and 1000-V Charged-Device Model.
9. Can the TCA9539PWR directly drive LEDs?
   Yes, the device has latched outputs with high-current drive capability, allowing it to directly drive LEDs.
10. What is the operating temperature range of the TCA9539PWR?
    The device operates within a temperature range of -40°C to 85°C.