Overview
The PCA9554DGVR, produced by Texas Instruments, is an 8-bit I2C and SMBus I/O expander designed for remote I/O expansion in various microcontroller-based systems. This device operates within a voltage range of 2.3 V to 5.5 V and is suitable for applications requiring general-purpose remote I/O expansion. The PCA9554DGVR is pin-to-pin and I2C address compatible with the PCF8574, although software changes may be necessary due to its enhanced features.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage (VCC) | 2.3 to 5.5 | V |
| Number of I/O | 8 | - |
| Interface | I2C, SMBus | - |
| Operating Free-Air Temperature | -40 to 85 | °C |
| 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 |
| Low-Level Output Current (P7–P0) | 25 | mA |
| Package Type | 16-TFSOP (0.173", 4.40mm Width) | - |
Key Features
- 8-bit I/O expander with configuration, input, output, and polarity inversion registers.
- Operates on a 2.3 V to 5.5 V supply voltage.
- Supports I2C and SMBus interfaces with a maximum clock frequency of 400 kHz.
- Three hardware address pins (A0, A1, A2) allow up to eight devices to share the same I2C/SMBus, and up to 16 devices when used with the PCA9554A.
- Open-drain interrupt output to indicate changes in input states.
- Latched outputs with high-current drive capability for directly driving LEDs.
- Internal power-on reset and noise filter on SCL/SDA inputs.
- ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
Applications
The PCA9554DGVR is suitable for a variety of applications, including:
- Remote I/O expansion in microcontroller-based systems.
- Industrial control systems requiring multiple I/O points.
- Automotive and consumer electronics where I2C or SMBus interfaces are used.
- LED display and indicator systems due to its high-current drive capability.
Q & A
- What is the operating voltage range of the PCA9554DGVR?
The PCA9554DGVR operates within a voltage range of 2.3 V to 5.5 V. - How many I/O ports does the PCA9554DGVR have?
The PCA9554DGVR has 8 I/O ports. - What interfaces does the PCA9554DGVR support?
The PCA9554DGVR supports both I2C and SMBus interfaces. - What is the maximum clock frequency for the I2C interface?
The maximum clock frequency for the I2C interface is 400 kHz. - How many devices can share the same I2C/SMBus?
Up to eight PCA9554 devices and eight PCA9554A devices can share the same I2C/SMBus, allowing for a total of 16 devices. - What is the purpose of the open-drain interrupt output?
The open-drain interrupt output is used to indicate to the system master that an input state has changed. - Can the PCA9554DGVR directly drive LEDs?
Yes, the PCA9554DGVR has latched outputs with high-current drive capability, making it suitable for directly driving LEDs. - What kind of ESD protection does the PCA9554DGVR have?
The PCA9554DGVR has ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model. - What is the operating temperature range of the PCA9554DGVR?
The operating free-air temperature range is -40°C to 85°C. - What package type is the PCA9554DGVR available in?
The PCA9554DGVR is available in a 16-TFSOP package.
