Overview
The PCA9535PWRG4, 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 PCA9535PWRG4 features low standby-current consumption, which is beneficial for power-sensitive designs.
Key Specifications
| Specification | Value |
|---|---|
| Voltage Range | 2.3 to 5.5 V |
| Number of I/Os | 16-bit |
| I2C/SMBus Frequency | Up to 400 kHz |
| Standby Current | 1 μA Max |
| Interrupt Output | Open-drain active-low |
| Package Type | 24-pin TSSOP |
| Input Voltage Range | Up to 5.5 V |
| I/O Configuration | Configurable as inputs or outputs |
| Polarity Inversion | Active-high or active-low operation |
Key Features
- Low standby-current consumption of 1 μA Max, reducing power consumption when I/Os are held low.
- I2C to parallel port expander, allowing for expansion of I/O capabilities.
- Open-drain active-low interrupt output to indicate changes in input states.
- Configurable I/Os as either inputs or outputs through I/O configuration registers.
- Polarity inversion capability for input ports (active-high or active-low operation).
- Power-on reset feature to initialize registers and I2C/SMBus state machine to default states.
- Three hardware pins (A0, A1, and A2) for programming and varying the fixed I2C address, allowing up to eight devices to share the same I2C bus or SMBus.
Applications
- Expanding the I/O capabilities of microcontrollers and other I2C or SMBus master devices.
- Low-power designs where minimizing standby current is crucial.
- Industrial control systems requiring multiple I/O points.
- Automotive and consumer electronics where I2C or SMBus communication is used.
- Any system requiring flexible and configurable I/O expansion.
Q & A
- What is the voltage range of the PCA9535PWRG4?
The PCA9535PWRG4 operates within a voltage range of 2.3 to 5.5 volts.
- How many I/Os does the PCA9535PWRG4 have?
The PCA9535PWRG4 has 16-bit I/Os.
- What is the maximum I2C/SMBus frequency supported by the PCA9535PWRG4?
The PCA9535PWRG4 supports I2C/SMBus frequencies up to 400 kHz.
- What is the standby current consumption of the PCA9535PWRG4?
The standby current consumption is 1 μA Max.
- Can the I/Os of the PCA9535PWRG4 be configured as inputs or outputs?
Yes, the I/Os can be configured as either inputs or outputs through the I/O configuration registers.
- What is the purpose of the open-drain active-low interrupt output?
The open-drain active-low interrupt output indicates changes in the input states.
- How many devices can share the same I2C bus or SMBus using the PCA9535PWRG4?
Up to eight devices can share the same I2C bus or SMBus using the PCA9535PWRG4.
- What is the package type of the PCA9535PWRG4?
The PCA9535PWRG4 comes in a 24-pin TSSOP package.
- Can the input voltage exceed the VCC voltage?
Yes, the input voltage can be raised above VCC to a maximum of 5.5 V.
- What is the purpose of the power-on reset feature?
The power-on reset feature initializes the registers and I2C/SMBus state machine to their default states when power is applied.
