Overview
The PCA9555DBR, produced by Texas Instruments, is a 16-bit I2C and SMBus I/O expander designed to provide general-purpose remote I/O expansion for most microcontroller families. It operates within a voltage range of 2.3 V to 5.5 V and is compatible with the I2C interface, utilizing serial clock (SCL) and serial data (SDA) lines. This device is part of the NXP Semiconductors family of I2C-bus I/O expanders and offers enhancements such as higher drive capability, 5 V I/O tolerance, lower supply current, and individual I/O configuration.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | SSOP (DB) | 24 pins |
| Operating Temperature Range | °C | -40 to 85 |
| Operating Voltage Range | V | 2.3 to 5.5 |
| I2C Bus Frequency | kHz | 400 |
| Standby Current Consumption | µA | 1 max |
| ESD Protection | V | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| Addressing | Three hardware address pins for up to eight devices | |
| Output Drive Capability | Latched outputs with high-current drive for directly driving LEDs |
Key Features
- Low standby-current consumption of 1 µA max.
- I2C to parallel port expander.
- Open-drain active-low interrupt output.
- 5-V tolerant I/O ports.
- Compatible with most microcontrollers.
- 400-kHz fast I2C bus.
- Address by three hardware address pins for use of up to eight devices.
- Polarity inversion register.
- Latched outputs with high-current drive capability for directly driving LEDs.
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
- ESD protection exceeds JESD 22 standards.
Applications
- ACPI power switches
- Sensors
- Push buttons
- LEDs
- Fans
- Routers (Telecom Switching Equipment)
- Personal Computers
- Personal Electronics
- Industrial Automation Equipment
- Products with GPIO-limited processors.
Q & A
- What is the PCA9555DBR used for?
The PCA9555DBR is used for general-purpose remote I/O expansion for most microcontroller families via the I2C interface.
- What is the operating voltage range of the PCA9555DBR?
The operating voltage range is 2.3 V to 5.5 V.
- What is the maximum standby current consumption of the PCA9555DBR?
The maximum standby current consumption is 1 µA.
- Does the PCA9555DBR support 5 V tolerant I/O ports?
- How many devices can be addressed using the PCA9555DBR on the same I2C bus?
- What is the purpose of the polarity inversion register in the PCA9555DBR?
The polarity inversion register allows the polarity of the input port register to be inverted.
- What type of interrupt output does the PCA9555DBR have?
The PCA9555DBR has an open-drain active-low interrupt output.
- What is the ESD protection level of the PCA9555DBR?
The ESD protection exceeds 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- Can the PCA9555DBR drive LEDs directly?
- What is the clock frequency of the I2C bus supported by the PCA9555DBR?
