Overview
The PCA9535CPW, produced by NXP USA Inc., is a 24-pin CMOS device designed to provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications. This device is part of the PCA9535 and PCA9535C series, which offer enhanced features such as higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, and smaller packaging. It is particularly useful in scenarios where additional I/O is required, such as for ACPI power switches, sensors, push buttons, LEDs, and fans.
Key Specifications
| Parameter | Description |
|---|---|
| Package Type | TSSOP24 |
| Operating Power Supply Voltage | 2.3 V to 5.5 V |
| I/O Tolerance | 5 V tolerant I/Os |
| Number of I/O Pins | 16 bits (2 x 8-bit) |
| Clock Frequency | 0 Hz to 400 kHz |
| ESD Protection | Exceeds 2000 V HBM, 200 V MM, and 1000 V CDM |
| Interrupt Output | Active LOW interrupt output |
| Polarity Inversion | Polarity Inversion register |
| Power-on Reset | Internal power-on reset |
| I²C-bus Addressing | Three hardware pins (A0, A1, A2) for address variation, allowing up to eight devices on the same bus |
Key Features
- Operating power supply voltage range of 2.3 V to 5.5 V
- 5 V tolerant I/Os
- Polarity Inversion register for flexible output configuration
- Active LOW interrupt output for efficient event handling
- Low standby current for power-efficient operation
- No glitch on power-up to ensure stable startup
- Internal power-on reset to initialize device state machine
- Noise filter on SCL/SDA inputs to enhance signal integrity
- ESD protection exceeding 2000 V HBM, 200 V MM, and 1000 V CDM
Applications
The PCA9535CPW is suitable for a variety of applications where additional I/O expansion is necessary. These include:
- ACPI power switches
- Sensors and monitoring systems
- Push buttons and user interfaces
- LED indicators and display systems
- Fans and other control devices
Q & A
- What is the PCA9535CPW used for?
The PCA9535CPW is used for providing 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications.
- What is the operating voltage range of the PCA9535CPW?
The operating voltage range is from 2.3 V to 5.5 V.
- Does the PCA9535CPW have 5 V tolerant I/Os?
Yes, the PCA9535CPW has 5 V tolerant I/Os.
- How many I/O pins does the PCA9535CPW have?
The PCA9535CPW has 16 bits of I/O, divided into two 8-bit ports.
- What is the clock frequency range of the PCA9535CPW?
The clock frequency range is from 0 Hz to 400 kHz.
- Does the PCA9535CPW have ESD protection?
Yes, it exceeds 2000 V HBM, 200 V MM, and 1000 V CDM.
- How does the PCA9535CPW handle power-on reset?
The device has an internal power-on reset that initializes the device state machine once the supply voltage reaches the operating level.
- Can multiple PCA9535CPW devices share the same I²C-bus?
Yes, up to eight devices can share the same I²C-bus/SMBus using three hardware pins (A0, A1, A2) for address variation.
- What is the purpose of the Polarity Inversion register?
The Polarity Inversion register allows for flexible output configuration by inverting the polarity of the read register.
- Does the PCA9535CPW have noise filtering on its inputs?
Yes, it has noise filters on SCL/SDA inputs to enhance signal integrity.
