PCA9534PWR

PCA9534PWR specifications:

• I/O Pins: 8 programmable input/output pins
• Interface: I²C and SMBus compatible
• Interrupt Output: Open-drain active-low interrupt output
• Operating Voltage Range: 2.3 V to 5.5 V
• I/O Voltage Tolerance: 5 V tolerant I/O ports
• Maximum Clock Frequency: 400 kHz
• Output Current: Maximum source current of 10 mA and sink current of 25 mA per I/O
• Power Consumption: Low standby current consumption of 1 µA maximum
• Addressability: Three hardware address pins allowing up to 8 devices on the same I²C/SMBus
• Package: 16-pin TSSOP (Thin Shrink Small Outline Package)
• Operating Temperature Range: -40°C to +85°C
• Additional Features:
  • Power-on reset
  • Polarity inversion register
  • Noise filter on SCL/SDA inputs
  • Latched outputs with high-current drive capability for directly driving LEDs

The PCA9534PWR from Texas Instruments is an 8-bit I/O expander that seamlessly integrates with I²C and SMBus, making it an excellent choice for microcontroller-based applications. Not only does it provide eight configurable input/output pins, but it also includes a low-power consumption mode, which helps minimize energy usage, particularly in battery-operated devices. Furthermore, its interrupt output feature ensures efficient event detection by immediately notifying the microcontroller when input states change, thereby reducing the need for continuous polling. In addition, since it operates within a wide voltage range of 2.3 V to 5.5 V, it is compatible with both low-voltage and standard logic-level circuits, making it even more versatile. Consequently, engineers can use this device across a variety of applications, ranging from embedded systems to industrial automation.

Moreover, because the PCA9534PWR supports a maximum I²C clock frequency of 400 kHz, it allows for relatively fast communication between the controller and peripheral devices, significantly improving system responsiveness. Notably, its three hardware address pins enable up to eight identical devices to coexist on the same bus without address conflicts, thereby facilitating system expansion. Additionally, as it features 5 V-tolerant I/O ports, it offers compatibility with higher voltage logic systems without requiring additional level-shifting components. Its latched outputs with high-current drive capability make it particularly well-suited for driving LEDs and other output loads directly.

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