Overview
The PCA9554ADWR is a remote 8-bit I2C and SMBus I/O expander produced by Texas Instruments. This CMOS device is designed to provide parallel input/output port expansion for I2C and SMBus compatible applications. It offers a versatile solution for adding more I/Os in various systems, making it ideal for use in sensors, power switches, LEDs, pushbuttons, and fans.
Key Specifications
| Specification | Value |
|---|---|
| Operating Power-Supply Voltage Range | 2.3 V to 5.5 V |
| I2C Bus Frequency | 400 kHz |
| Package Type | 16-SOIC (0.295", 7.50mm Width) |
| Number of I/Os | 8-bit |
| Interrupt Output | Open-Drain Active-Low |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| Maximum Current per I/O | 25 mA |
| Maximum Total Current for All I/Os | 85 mA |
Key Features
- I2C to Parallel Port Expander
- Open-Drain Active-Low Interrupt Output
- 5-V Tolerant I/Os
- 400-kHz Fast I2C Bus
- Three Hardware Address Pins allowing up to eight devices on the I2C/SMBus
- Input/Output Configuration Register
- Polarity Inversion Register
- Internal Power-On Reset
- Power-Up with all channels configured as inputs
- No glitch on power up
- Latched Outputs with high-current drive capability for directly driving LEDs
- Latch-Up Performance exceeds 100 mA per JESD 78, Class II
Applications
The PCA9554ADWR is suitable for a variety of applications where additional I/Os are required. These include:
- Sensors
- Power switches
- LEDs
- Pushbuttons
- Fans
Q & A
- What is the operating power-supply voltage range of the PCA9554ADWR?
The operating power-supply voltage range is 2.3 V to 5.5 V.
- What is the maximum frequency of the I2C bus for the PCA9554ADWR?
The maximum frequency of the I2C bus is 400 kHz.
- What type of package is the PCA9554ADWR available in?
The PCA9554ADWR is available in a 16-SOIC package.
- How many I/Os does the PCA9554ADWR provide?
The PCA9554ADWR provides an 8-bit parallel input/output port.
- What type of interrupt output does the PCA9554ADWR have?
The PCA9554ADWR has an open-drain active-low interrupt output.
- What is the ESD protection level of the PCA9554ADWR?
The PCA9554ADWR has ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- What is the maximum current that can be sourced by each I/O?
Each I/O must be externally limited to a maximum of 25 mA.
- What is the total maximum current for all I/Os combined?
The total current sourced by all I/Os must be limited to 85 mA.
- Can the PCA9554ADWR be used with multiple devices on the same bus?
- What kind of registers does the PCA9554ADWR have?
The PCA9554ADWR has an input port register, an output port register, a configuration register, and a polarity inversion register.
