TCA9535PWR Detai LED explanation of pin function specifications and circuit principle instructions
The TCA9535PWR is a product manufactured by Texas Instruments. It is an I2C-bus-control LED , 16-bit I/O expander designed for use in systems where you need to extend the number of available input/output pins using I2C communication.
Package Type and Pinout
Package Type: TSSOP-24 (24-pin Thin Shrink Small Outline Package)Detailed Pin Function Specification
The TCA9535PWR comes in a 24-pin package, and each pin has a specific function. Below is the comprehensive pin function table:
Pin Number Pin Name Pin Type Pin Function 1 VSS Power Ground pin. 2 SCL Input/Output I2C clock line, used to synchronize data transfer. 3 SDA Input/Output I2C data line, used to carry data during transfer. 4 RESET Input Active-low reset input pin, resets the device when low. 5 P0.0 I/O I/O port 0.0, can be configured as input or output. 6 P0.1 I/O I/O port 0.1, can be configured as input or output. 7 P0.2 I/O I/O port 0.2, can be configured as input or output. 8 P0.3 I/O I/O port 0.3, can be configured as input or output. 9 P0.4 I/O I/O port 0.4, can be configured as input or output. 10 P0.5 I/O I/O port 0.5, can be configured as input or output. 11 P0.6 I/O I/O port 0.6, can be configured as input or output. 12 P0.7 I/O I/O port 0.7, can be configured as input or output. 13 P1.0 I/O I/O port 1.0, can be configured as input or output. 14 P1.1 I/O I/O port 1.1, can be configured as input or output. 15 P1.2 I/O I/O port 1.2, can be configured as input or output. 16 P1.3 I/O I/O port 1.3, can be configured as input or output. 17 P1.4 I/O I/O port 1.4, can be configured as input or output. 18 P1.5 I/O I/O port 1.5, can be configured as input or output. 19 P1.6 I/O I/O port 1.6, can be configured as input or output. 20 P1.7 I/O I/O port 1.7, can be configured as input or output. 21 VDD Power Positive supply voltage pin. Typically 3.3V or 5V. 22 INT Output Interrupt output pin. It signals when there is a change in I/O status. 23 NC No Connection No connection, not used in the circuit. 24 NC No Connection No connection, not used in the circuit.FAQ (Frequently Asked Questions)
What is the TCA9535PWR used for? The TCA9535PWR is used to expand the number of I/O pins in a system via I2C communication, useful for applications requiring more input/output devices. What voltage is required for the TCA9535PWR? The TCA9535PWR typically operates with a supply voltage of 3.3V to 5V, as specified on the VDD pin (pin 21). How many I/O pins are available on the TCA9535PWR? The TCA9535PWR provides 16 I/O pins, split into two 8-bit banks (P0.0 to P0.7 and P1.0 to P1.7). What is the purpose of the RESET pin? The RESET pin (pin 4) is used to reset the device, and it must be pulled low to initiate a reset. How is the TCA9535PWR controlled? The TCA9535PWR is controlled via I2C communication using the SDA (pin 3) and SCL (pin 2) pins for data and clock signals, respectively. What is the function of the INT pin? The INT pin (pin 22) is an interrupt output that signals when a change in input/output status occurs, enabling event-driven operations. Can the TCA9535PWR be used to drive high-power devices? The TCA9535PWR is designed for low-power devices and should not be used to drive high-power loads directly. External transistor s or relays may be required. How does the TCA9535PWR communicate with a microcontroller? The TCA9535PWR communicates with a microcontroller via the I2C protocol using the SDA and SCL lines. Can the TCA9535PWR be used in 5V systems? Yes, the TCA9535PWR can be used in both 3.3V and 5V systems, but ensure that the voltage levels are compatible with the devices connected to the I/O pins.What is the significance of the VSS pin?
The VSS pin (pin 1) is the ground pin, providing the reference point for the device's voltage levels.What happens when the RESET pin is held low for an extended period?
If the RESET pin is held low, the device will remain in reset mode and will not function until the pin is released.What are the limitations of the TCA9535PWR’s I/O pins?
The I/O pins are designed for low-power logic-level signals and may not handle high current or voltages beyond specified ratings.How can the I/O pins be configured?
Each I/O pin (P0.x and P1.x) can be configured as either an input or an output via the internal configuration registers.Can the TCA9535PWR be used to interface with LEDs?
Yes, the TCA9535PWR can interface with LEDs, provided that current-limiting resistors are used to prevent damage to the I/O pins.What is the maximum frequency for the I2C communication?
The maximum I2C clock frequency is typically 400 kHz, but it depends on the specific configuration and application.Is there a specific order for connecting the I2C lines to the TCA9535PWR?
The SDA (data) and SCL (clock) lines should be connected according to the I2C standard, with pull-up resistors on each line for proper communication.How do you handle multiple TCA9535PWR devices on the same I2C bus?
Multiple TCA9535PWR devices can be used on the same I2C bus by assigning different I2C addresses to each device.Can the TCA9535PWR handle both digital inputs and outputs?
Yes, the TCA9535PWR supports both digital inputs and outputs, allowing flexibility in various applications.How does the TCA9535PWR handle interrupts?
The device generates interrupts on the INT pin when an input/output state change occurs, which can be used for event-driven processing.What happens if the TCA9535PWR is used in an overvoltage condition?
The TCA9535PWR is designed to operate within the specified voltage ranges (typically 3.3V or 5V). Exceeding these ranges can damage the device.I hope this provides the detailed information you were looking for! If you need further clarification or additional details, feel free to ask!