Overview
The PCA9535DBR, produced by Texas Instruments, is a 16-bit I2C and SMBus low-power I/O expander. This device is designed to provide remote I/O expansion for most microcontroller families via the I2C interface. It operates within a supply voltage range of 2.3 V to 5.5 V, making it versatile for various applications. The PCA9535DBR features low standby-current consumption, which is crucial for power-sensitive designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 2.3 to 5.5 | V |
| Standby Supply Current | 1 | μA (max) |
| Operating Temperature Range | -40 to 85 | °C |
| I/O Configuration | Input or Output selection via I/O configuration bits | |
| Interrupt Output | Open-drain active-low | |
| I2C Addressing | Three hardware pins (A0, A1, A2) for address programming; up to eight devices can share the same I2C bus or SMBus | |
| Package Options | SSOP, DBQ, DGV, DW, PW |
Key Features
- Low standby-current consumption of 1 μA max, reducing power consumption when I/Os are held low.
- I2C to parallel port expander, enabling remote I/O expansion.
- Open-drain active-low interrupt output to indicate changes in input state.
- Two 8-bit Configuration, Input Port, Output Port, and Polarity Inversion registers for flexible I/O management.
- Power-on reset feature to initialize the device in case of improper operation.
- Support for up to eight devices on the same I2C bus or SMBus using three hardware address pins (A0, A1, A2).
Applications
- Microcontroller-based systems requiring additional I/O ports.
- Industrial control systems where remote I/O expansion is necessary.
- Automotive and consumer electronics where low power consumption is critical.
- Medical devices and other applications requiring precise I/O control and low power usage.
Q & A
- What is the supply voltage range of the PCA9535DBR?
The PCA9535DBR operates within a supply voltage range of 2.3 V to 5.5 V.
- What is the standby supply current of the PCA9535DBR?
The standby supply current is 1 μA max.
- How does the PCA9535DBR handle I/O configuration?
The I/Os can be configured as inputs or outputs by writing to the I/O configuration bits.
- What type of interrupt output does the PCA9535DBR have?
The PCA9535DBR has an open-drain active-low interrupt output.
- Can multiple PCA9535DBR devices share the same I2C bus?
Yes, up to eight devices can share the same I2C bus or SMBus using the three hardware address pins (A0, A1, A2).
- What is the purpose of the power-on reset feature?
The power-on reset feature initializes the device in case of improper operation, resetting the registers to their default state.
- What are the package options available for the PCA9535DBR?
The PCA9535DBR is available in SSOP, DBQ, DGV, DW, and PW packages.
- How does the PCA9535DBR manage polarity inversion?
The polarity of the Input Port register can be inverted using the Polarity Inversion register.
- What is the operating temperature range of the PCA9535DBR?
The operating temperature range is -40°C to 85°C.
- Can the PCA9535DBR be used in automotive applications?
Yes, the PCA9535DBR is suitable for automotive and other applications requiring low power consumption and precise I/O control.
