Overview
The PCAL9555APW,118 is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander manufactured by NXP USA Inc. This device is designed for I²C-bus/SMBus applications and features Agile I/O, interrupt capabilities, and weak pull-up resistors. It provides a flexible solution for expanding the I/O capabilities of microprocessors and microcontrollers, especially in environments where power conservation is crucial. The PCAL9555A is backward compatible with the PCA9555 and PCA9555A, making it a versatile choice for various applications.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | NXP USA Inc. |
| Package | 24-TSSOP (0.173, 4.40mm Width) |
| Interface | I²C, SMBus |
| Supply Voltage | 1.8 V / 5 V |
| Technology | CMOS |
| Clock Frequency | 400 kHz |
| Terminal Pitch | 0.65 mm |
| Operating Temperature | -40°C to 85°C |
| Output Type | Open Drain, Push-Pull |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Key Features
- Agile I/O: Programmable output drive strength, latchable inputs, programmable pull-up/pull-down resistors, and maskable interrupt capabilities.
- Interrupt Capabilities: Open-drain interrupt output that can inform the microcontroller of input state changes without continuous I²C-bus communication.
- Weak Pull-Up Resistors: Powers up with weak pull-up resistors enabled, reducing the need for external components.
- Flexible Configuration: Bank-selectable push-pull or open-drain output stages and bit-wise I/O programming features.
- Low Power Consumption: Operates over a wide voltage range (1.65 V to 5.5 V) to interface with next-generation microprocessors and microcontrollers.
- Hardware Addressing: Three hardware pins (A0, A1, A2) allow up to eight devices to share the same I²C-bus/SMBus.
Applications
- ACPI Power Switches: Used in power management systems to control power states.
- Sensors and Push Buttons: Expands I/O for sensing and input applications.
- LED and Fan Control: Directly drives LEDs and controls fan operations with low device current.
- Industrial and Automotive Systems: Suitable for industrial and automotive environments due to its wide operating temperature range and robust features.
Q & A
- What is the PCAL9555APW,118 used for?
The PCAL9555APW,118 is a 16-bit GPIO expander used to expand the I/O capabilities of microprocessors and microcontrollers in various applications.
- What interfaces does the PCAL9555APW,118 support?
The device supports I²C and SMBus interfaces.
- What is the supply voltage range of the PCAL9555APW,118?
The supply voltage range is from 1.65 V to 5.5 V.
- What are the key features of the Agile I/O in the PCAL9555APW,118?
The Agile I/O features include programmable output drive strength, latchable inputs, programmable pull-up/pull-down resistors, and maskable interrupt capabilities.
- How does the interrupt function work in the PCAL9555APW,118?
The open-drain interrupt output is activated when any input state differs from its corresponding Input Port register state, informing the system master of input state changes.
- What is the operating temperature range of the PCAL9555APW,118?
The operating temperature range is from -40°C to 85°C.
- Can multiple PCAL9555APW,118 devices share the same I²C-bus/SMBus?
Yes, up to eight devices can share the same I²C-bus/SMBus using three hardware address pins (A0, A1, A2).
- What is the output type of the PCAL9555APW,118?
The output type can be configured as either open-drain or push-pull.
- What is the significance of the weak pull-up resistors in the PCAL9555APW,118?
The weak pull-up resistors are enabled by default at power-up, reducing the need for external pull-up resistors.
- Is the PCAL9555APW,118 backward compatible with other NXP GPIO expanders?
Yes, it is backward compatible with the PCA9555 and PCA9555A.
- What are some common applications of the PCAL9555APW,118?
Common applications include ACPI power switches, sensors, push buttons, LED and fan control, and various industrial and automotive systems.
