Overview
The PCA9555PW, produced by NXP USA Inc., is a 16-bit I²C-bus and SMBus I/O port expander designed to provide general-purpose remote I/O expansion for most microcontroller families. This CMOS device operates over a wide voltage range of 2.3 V to 5.5 V and is available in various packages, including TSSOP24. It is part of NXP's family of I²C-bus I/O expanders, offering enhanced features such as higher drive capability, 5 V I/O tolerance, and low standby current consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Power Supply Voltage | 2.3 - 5.5 | V |
| Standby Current Consumption | 1 | μA |
| I²C Bus Frequency | 0 - 400 | kHz |
| Number of I/O Pins | 16 | - |
| Default I/O Configuration at Power-On | Inputs with weak pull-up resistors | - |
| Interrupt Output Type | Open-drain active LOW | - |
| ESD Protection | 2000 V HBM, 200 V MM, 1000 V CDM | - |
| Package Type | TSSOP24 | - |
| Operating Temperature Range | -40 to 85 | °C |
Key Features
- 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications.
- Operating power supply voltage range of 2.3 V to 5.5 V.
- Ultra-low standby current consumption of 1 μA maximum.
- 5 V tolerant I/O ports.
- Open-drain active LOW interrupt output.
- 400 kHz Fast-mode I²C-bus.
- Internal power-on reset with no glitch on power-up.
- Latched outputs with high-current drive capability for directly driving LEDs.
- Three hardware address pins (A0, A1, A2) allowing up to eight devices to share the same I²C-bus/SMBus.
- Polarity Inversion register for inverting the polarity of the input register.
- Schmitt-trigger action on SCL and SDA inputs for better noise immunity.
Applications
- Servers and routers (telecom switching equipment).
- Personal computers and personal electronics.
- Industrial automation equipment.
- Products with GPIO-limited processors.
- ACPI power switches, sensors, push buttons, LEDs, and fan control.
Q & A
- What is the PCA9555PW used for?
The PCA9555PW is used for providing 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications. - What is the operating voltage range of the PCA9555PW?
The operating voltage range is 2.3 V to 5.5 V. - What is the standby current consumption of the PCA9555PW?
The standby current consumption is 1 μA maximum. - How many devices can share the same I²C-bus/SMBus using the PCA9555PW?
Up to eight devices can share the same I²C-bus/SMBus using the three hardware address pins (A0, A1, A2). - What type of interrupt output does the PCA9555PW have?
The PCA9555PW has an open-drain active LOW interrupt output. - What is the maximum I²C bus frequency supported by the PCA9555PW?
The maximum I²C bus frequency supported is 400 kHz. - What kind of ESD protection does the PCA9555PW offer?
The PCA9555PW offers ESD protection exceeding 2000 V HBM, 200 V MM, and 1000 V CDM. - What is the default configuration of the I/O pins at power-on?
The I/O pins default to inputs with weak pull-up resistors at power-on. - Can the PCA9555PW drive LEDs directly?
Yes, the PCA9555PW has latched outputs with high-current drive capability for directly driving LEDs. - What is the purpose of the Polarity Inversion register in the PCA9555PW?
The Polarity Inversion register allows the polarity of the input register to be inverted.
