Overview
The PCA9535DWR, produced by Texas Instruments, is a 16-bit I2C and SMBus low-power I/O expander. This device is designed to expand the I/O capabilities of microcontrollers and other I2C or SMBus master devices. It operates within a voltage range of 2.3V to 5.5V, making it versatile for various applications. The PCA9535DWR features low standby current consumption, which is beneficial for power-sensitive designs. It includes configuration, input, output, and polarity inversion registers, allowing for flexible I/O configuration and operation.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Number of I/O | 16 | |
| Interface | I2C, SMBus | |
| Operating Voltage | 2.3V to 5.5V | |
| Standby Current | 1 μA Max | VI = GND, IO = 0, I/O = inputs, fSCL = 0 kHz |
| Package | 24-SOIC (0.295", 7.50mm Width) | |
| Interrupt Output | Open-drain active-low | Activated when any input state differs from its corresponding Input Port register state |
| I2C Addressing | Three hardware pins (A0, A1, A2) for address programming | Allows up to eight devices to share the same I2C bus or SMBus |
Key Features
- Low standby-current consumption of 1 μA Max, reducing power consumption in standby mode
- I2C to parallel port expander, enabling expansion of I/O capabilities for microcontrollers and other I2C or SMBus master devices
- Open-drain active-low interrupt output, indicating changes in input states
- Configuration, input, output, and polarity inversion registers for flexible I/O configuration and operation
- Power-on reset feature to reset the device to its default state in case of improper operation
- Support for up to eight devices on the same I2C bus or SMBus using three hardware pins for address programming
Applications
- Expansion of I/O capabilities for microcontrollers and other I2C or SMBus master devices in various embedded systems
- Industrial control systems where additional I/O ports are required
- Automotive systems for sensor and actuator control
- Consumer electronics, such as smart home devices and appliances, requiring additional I/O ports
- Medical devices and equipment that need low-power I/O expansion
Q & A
- What is the operating voltage range of the PCA9535DWR?
The PCA9535DWR operates within a voltage range of 2.3V to 5.5V
- How many I/O ports does the PCA9535DWR have?
The PCA9535DWR has 16 I/O ports
- What type of interface does the PCA9535DWR support?
The PCA9535DWR supports I2C and SMBus interfaces
- What is the standby current consumption of the PCA9535DWR?
The standby current consumption is 1 μA Max
- How does the PCA9535DWR handle interrupt outputs?
The PCA9535DWR has an open-drain active-low interrupt output that is activated when any input state differs from its corresponding Input Port register state
- Can multiple PCA9535DWR devices share the same I2C bus or SMBus?
Yes, up to eight devices can share the same I2C bus or SMBus using three hardware pins for address programming
- What is the package type of the PCA9535DWR?
The PCA9535DWR comes in a 24-SOIC package (0.295", 7.50mm Width)
- How does the power-on reset feature work on the PCA9535DWR?
The power-on reset feature resets the device to its default state in case of improper operation or timeout, initializing the I2C/SMBus state machine
- What are some common applications of the PCA9535DWR?
Common applications include industrial control systems, automotive systems, consumer electronics, and medical devices
- Can the PCA9535DWR be used in low-power designs?
Yes, the PCA9535DWR is suitable for low-power designs due to its low standby current consumption
