The "TCA6424ARGJR" model is a part of the Texas Instruments family. It is a device from their I/O expander category, specifically a 24-bit I/O expander with a built-in I2C interface . This part is used for expanding the I/O capabilities of a microcontroller or processor, providing additional digital I/O pins for systems where there is a need for more inputs or outputs than the available I/O pins on the microcontroller.
Package:
The TCA6424ARGJR is a VQFN-24 (Very Thin Quad Flat No-lead) package, which has 24 pins.
Pin Function Specification and Circuit Principle:
Here’s a detai LED breakdown of the 24 pins on the TCA6424ARGJR I/O expander, including pin functions and usage:
Pin Number Pin Name Pin Function Description 1 VCC Power supply input. This pin should be connected to a supply voltage, typically 2.3V to 5.5V. 2 GND Ground. Connect to the system ground. 3 SDA Serial Data Line for I2C communication. This pin carries the data between the I2C master and the TCA6424. 4 SCL Serial Clock Line for I2C communication. This pin provides the clock signal for I2C data transfer. 5 A0 Address pin A0. Can be used to configure the I2C address. Connect to GND or VCC to adjust the address in the I2C communication. 6 A1 Address pin A1. Similar to A0, used for I2C address configuration. 7 A2 Address pin A2. Used for setting the I2C address. 8 A3 Address pin A3. Part of the address configuration for I2C. 9 P0.0 I/O pin 0. Can be configured as an input or output. In input mode, it can detect logic levels. 10 P0.1 I/O pin 1. Configurable as input/output. 11 P0.2 I/O pin 2. Configurable as input/output. 12 P0.3 I/O pin 3. Configurable as input/output. 13 P0.4 I/O pin 4. Configurable as input/output. 14 P0.5 I/O pin 5. Configurable as input/output. 15 P0.6 I/O pin 6. Configurable as input/output. 16 P0.7 I/O pin 7. Configurable as input/output. 17 P1.0 I/O pin 8. Configurable as input/output. 18 P1.1 I/O pin 9. Configurable as input/output. 19 P1.2 I/O pin 10. Configurable as input/output. 20 P1.3 I/O pin 11. Configurable as input/output. 21 P1.4 I/O pin 12. Configurable as input/output. 22 P1.5 I/O pin 13. Configurable as input/output. 23 P1.6 I/O pin 14. Configurable as input/output. 24 P1.7 I/O pin 15. Configurable as input/output.The pins P0.0 to P1.7 are the I/O pins and can be configured as either inputs or outputs using the internal registers of the TCA6424. These pins can be used for controlling various devices or reading signals from external sensors, switches, etc.
FAQs for the TCA6424ARGJR:
What is the function of the SDA pin on the TCA6424ARGJR? The SDA pin is the Serial Data Line for I2C communication. It is used to transmit data between the master device and the TCA6424. What is the function of the SCL pin on the TCA6424ARGJR? The SCL pin is the Serial Clock Line for I2C communication. It provides the clock signal to synchronize the data transfer. How do I configure the I2C address of the TCA6424ARGJR? The I2C address of the TCA6424 is configured using the address pins A0, A1, A2, and A3. These pins can be connected to GND or VCC to set the desired address. How many I/O pins does the TCA6424ARGJR have? The TCA6424ARGJR has a total of 16 I/O pins, which are configured as either inputs or outputs. What voltage range is supported by the TCA6424ARGJR? The TCA6424ARGJR supports a voltage range of 2.3V to 5.5V for the VCC pin. Can the I/O pins be configured as open-drain outputs? Yes, the I/O pins can be configured as open-drain outputs, depending on the configuration settings. How is the TCA6424ARGJR powered? The TCA6424ARGJR is powered by applying a voltage to the VCC pin, typically in the range of 2.3V to 5.5V. What is the maximum current that can be sourced or sunk by the I/O pins? The I/O pins can source or sink up to 25mA of current, but this is subject to the specific voltage and conditions applied. Is the TCA6424ARGJR compatible with 3.3V logic? Yes, the TCA6424ARGJR is compatible with both 3.3V and 5V logic systems.Can I use the TCA6424ARGJR in a 5V system?
Yes, the TCA6424ARGJR can be used in 5V systems, and it will operate correctly within the voltage range of 2.3V to 5.5V.What is the communication protocol used by the TCA6424ARGJR?
The TCA6424ARGJR uses the I2C communication protocol for communication with the host microcontroller or processor.How many devices can be connected on the same I2C bus with the TCA6424ARGJR?
The number of devices that can be connected depends on the I2C address range. With four address pins, a maximum of 16 devices can be connected to the same bus.What is the default I2C address of the TCA6424ARGJR?
The default I2C address is typically 0x20, but it can be adjusted using the address pins.Can I use the TCA6424ARGJR in a multi-master I2C configuration?
Yes, the TCA6424ARGJR can operate in a multi-master I2C system.What is the maximum clock frequency for I2C communication with the TCA6424ARGJR?
The maximum clock frequency for I2C communication is typically 400kHz (Fast-mode) or 1MHz (High-speed mode).Is the TCA6424ARGJR suitable for use with 1.8V logic systems?
The TCA6424ARGJR is not designed to support 1.8V logic directly. It is better suited for 2.3V or higher logic systems.How do I reset the TCA6424ARGJR?
The TCA6424ARGJR does not have a dedicated reset pin, but it can be reset by toggling the power supply or performing a software reset via the I2C interface.What happens if I apply incorrect voltage to the VCC pin?
Applying incorrect voltage to the VCC pin (either too high or too low) may cause the TCA6424ARGJR to malfunction or get damaged.How do I enable/disable specific I/O pins on the TCA6424ARGJR?
The I/O pins are controlled via the internal registers. You can configure each pin as input or output using I2C commands.Can I use the TCA6424ARGJR for controlling LEDs or motors?
Yes, the TCA6424ARGJR can be used for controlling LEDs or small motors by configuring the I/O pins as outputs and controlling them via the I2C interface.This covers the pin function specifications, packaging details, and a set of FAQs for the TCA6424ARGJR.
