Overview
The PCA9535RTWR, produced by Texas Instruments, is a remote 16-bit I2C and SMBus low-power I/O expander. This device is designed to provide an efficient way to expand the I/O capabilities of a microcontroller or other I2C/SMBus master device. It features low standby current consumption, making it suitable for power-sensitive applications. The PCA9535RTWR is part of the PCA9535 family and is available in various package types, including TSSOP and SOIC.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 2.3 to 5.5 | V |
| Operating Temperature | -40 to 85 | °C |
| Standby Current | 1.5 to 8.7 | μA |
| I/O Low-Level Output Current | 25 | mA |
| I2C Bus Frequency | Up to 400 kHz | kHz |
| Interrupt Output Type | Open-drain active-low | |
| Addressing | Three hardware pins (A0, A1, A2) for I2C address selection | |
| Package Types | TSSOP, SOIC, etc. |
Key Features
- Low standby-current consumption of 1 μA max.
- I2C to parallel port expander with 16-bit I/O expansion.
- Open-drain active-low interrupt output to indicate input state changes.
- Configurable I/O ports (input or output) with polarity inversion capability.
- Power-on reset feature to initialize registers and I2C/SMBus state machine.
- Support for up to eight devices on the same I2C bus or SMBus.
- Push-pull design structure for I/O ports.
Applications
- Expanding the I/O capabilities of microcontrollers or other I2C/SMBus master devices.
- Industrial control systems where additional I/O is required.
- Automotive systems for sensor and actuator control.
- Consumer electronics for peripheral control.
- Medical devices requiring low-power I/O expansion.
Q & A
- What is the PCA9535RTWR used for? The PCA9535RTWR is used to expand the I/O capabilities of a microcontroller or other I2C/SMBus master device.
- What is the standby current consumption of the PCA9535RTWR? The standby current consumption is 1.5 to 8.7 μA.
- What is the operating temperature range of the PCA9535RTWR? The operating temperature range is -40 to 85 °C.
- How many devices can share the same I2C bus or SMBus? Up to eight devices can share the same I2C bus or SMBus.
- What type of interrupt output does the PCA9535RTWR have? The PCA9535RTWR has an open-drain active-low interrupt output.
- Can the I/O ports be configured as inputs or outputs? Yes, the I/O ports can be configured as either inputs or outputs.
- What is the purpose of the power-on reset feature? The power-on reset feature initializes the registers and I2C/SMBus state machine when power is applied.
- What are the package types available for the PCA9535RTWR? The PCA9535RTWR is available in TSSOP, SOIC, and other package types.
- What is the maximum I2C bus frequency supported by the PCA9535RTWR? The PCA9535RTWR supports I2C bus frequencies up to 400 kHz.
- Can the polarity of the input ports be inverted? Yes, the polarity of the input ports can be inverted using the Polarity Inversion register.
