Overview
The PCA9554ARGTR is an 8-bit I2C and SMBus I/O expander produced by Texas Instruments. This device is designed to provide general-purpose remote I/O expansion for most microcontroller families via the I2C interface. It operates within a power-supply voltage range of 2.3 V to 5.5 V and is packaged in a 16-pin VQFN (RGT) package. The PCA9554ARGTR features an open-drain interrupt output, high-current drive capability for directly driving LEDs, and low current consumption, making it a versatile component for various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VQFN (RGT) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage Range | 2.3 to 5.5 | V |
| I2C Bus Frequency | 400 kHz | - |
| High-Level Input Voltage (SCL, SDA) | 0.7 × VCC | V |
| Low-Level Input Voltage (SCL, SDA) | 0.3 × VCC | V |
| High-Level Output Current (P7-P0) | -10 mA | mA |
| Low-Level Output Current (P7-P0) | 25 mA | mA |
| Junction-to-Ambient Thermal Resistance | 63.2 °C/W | °C/W |
Key Features
- I2C to Parallel Port Expander
- Open-Drain Active-Low Interrupt Output
- Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
- 5-V Tolerant I/Os
- 400-kHz Fast I2C Bus
- Three Hardware Address Pins Allow 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
- ESD Protection Exceeds JESD 22 (2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model)
Applications
The PCA9554ARGTR is suitable for a variety of applications requiring remote I/O expansion, including:
- Industrial Automation Systems
- Consumer Electronics
- Medical Devices
- Automotive Systems
- Embedded Systems Requiring I/O Expansion
Q & A
- What is the operating voltage range of the PCA9554ARGTR?
The PCA9554ARGTR operates within a power-supply voltage range of 2.3 V to 5.5 V.
- What is the maximum frequency of the I2C bus for the PCA9554ARGTR?
The I2C bus frequency for the PCA9554ARGTR is up to 400 kHz.
- How many devices can share the same I2C/SMBus using the PCA9554ARGTR?
Up to eight devices can share the same I2C/SMBus using the PCA9554ARGTR, thanks to its three hardware address pins.
- What is the purpose of the open-drain interrupt output on the PCA9554ARGTR?
The open-drain interrupt output is activated when any input state differs from its corresponding Input Port register state, indicating to the system master that an input state has changed.
- Can the PCA9554ARGTR directly drive LEDs?
Yes, the PCA9554ARGTR has latched outputs with high-current drive capability, allowing it to directly drive LEDs.
- What is the thermal resistance of the PCA9554ARGTR in the VQFN (RGT) package?
The junction-to-ambient thermal resistance for the VQFN (RGT) package is 63.2 °C/W.
- Is the PCA9554ARGTR compatible with other Texas Instruments devices?
The PCA9554ARGTR is pin-to-pin and I2C address compatible with the PCF8574A, although software changes may be required due to enhancements.
- What kind of ESD protection does the PCA9554ARGTR offer?
The PCA9554ARGTR offers ESD protection exceeding JESD 22 standards, including 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- How are the I/Os configured at power-up for the PCA9554ARGTR?
At power-up, the I/Os are configured as inputs with a weak pull-up to VCC.
- Can the PCA9554ARGTR be reset by the system master?
Yes, the system master can reset the PCA9554ARGTR using the power-on reset feature, which puts the registers in their default state and initializes the I2C/SMBus state machine.
