Overview
The PCA9535DBQR, 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 2.3 to 5.5 volts, making it versatile for various applications. The PCA9535DBQR features low standby-current consumption, which is particularly beneficial for power-sensitive designs.
Key Specifications
| Parameter | Value |
|---|---|
| Voltage Range | 2.3 V to 5.5 V |
| Number of I/Os | 16 bits (two 8-bit ports) |
| Interface | I2C and SMBus compatible |
| Standby Current | Maximum 1 μA |
| Interrupt Output | Open-drain active-low |
| Addressing | Three hardware pins (A0, A1, A2) for I2C address programming |
| Package Type | SSOP-24-150mil |
| Maximum I/O Current | 25 mA per I/O, 100 mA per octal, 200 mA total |
Key Features
- Low standby-current consumption of 1 μA maximum
- I2C to parallel port expander
- Open-drain active-low interrupt output
- Configuration, Input Port, Output Port, and Polarity Inversion registers
- Power-on reset feature to initialize registers and I2C/SMBus state machine
- Three hardware pins for I2C address programming, allowing up to eight devices on the same bus
Applications
The PCA9535DBQR is suitable for a variety of applications where I/O expansion is necessary, such as in industrial control systems, medical devices, consumer electronics, and automotive systems. It is particularly useful in designs where low power consumption is critical.
Q & A
- What is the voltage range of the PCA9535DBQR?
The PCA9535DBQR operates within a voltage range of 2.3 to 5.5 volts. - How many I/Os does the PCA9535DBQR have?
The PCA9535DBQR has 16 bits of I/O, divided into two 8-bit ports. - What type of interface does the PCA9535DBQR use?
The PCA9535DBQR uses an I2C and SMBus compatible interface. - What is the standby current consumption of the PCA9535DBQR?
The standby current consumption is a maximum of 1 μA. - How is the interrupt output configured?
The interrupt output is an open-drain active-low configuration. - How can the I2C address be programmed?
The I2C address can be programmed using three hardware pins (A0, A1, A2). - What is the maximum current per I/O and per octal?
Each I/O is limited to a maximum of 25 mA, and each octal is limited to a maximum of 100 mA, with a total device limit of 200 mA. - What is the package type of the PCA9535DBQR?
The package type is SSOP-24-150mil. - Can multiple PCA9535DBQR devices share the same I2C bus?
Yes, up to eight devices can share the same I2C bus or SMBus. - What is the purpose of the power-on reset feature?
The power-on reset feature initializes the registers and the I2C/SMBus state machine in case of a timeout or improper operation.
