Overview
The PCA9555PW,118 is a 24-pin CMOS device produced by NXP USA Inc., designed to provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications. This device is part of the NXP Semiconductors family of I2C-bus I/O expanders and offers several enhancements including higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, and smaller packaging. It is particularly useful in scenarios where additional I/O is needed, such as in ACPI power switches, sensors, push buttons, LEDs, and fan control.
Key Specifications
| Attribute | Specification |
|---|---|
| Interface Type | I2C/SMBus |
| Clock Frequency - Max | 400 kHz |
| Number of I/O Lines | 16 |
| Supply Voltage - Nominal | 2.3 V to 5.5 V |
| Supply Current | 160 mA (max), 1 μA (standby) |
| Package Style | TSSOP-24 |
| Mounting Method | Surface Mount |
| Operating Temperature Range | -40°C to 85°C |
| ESD Protection | 2000 V HBM, 200 V MM, 1000 V CDM |
Key Features
- Operating power supply voltage range of 2.3 V to 5.5 V
- 5 V tolerant I/Os
- Polarity Inversion register for active HIGH or active LOW operation
- Active LOW interrupt output
- Low standby current of 1 μA max
- Noise filter on SCL/SDA inputs
- No glitch on power-up
- Internal power-on reset
- 16 I/O pins which default to inputs with weak pull-up resistors
- 400 kHz Fast-mode I2C-bus
- Latched outputs with high-current drive capability for directly driving LEDs
- ESD protection exceeding JESD 22 standards
Applications
- Servers and data centers
- Routers and telecom switching equipment
- Personal computers and personal electronics
- Industrial automation equipment
- Products with GPIO-limited processors, such as ACPI power switches, sensors, push buttons, LEDs, and fan control
Q & A
- What is the PCA9555PW,118 used for?
The PCA9555PW,118 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,118?
The operating voltage range is from 2.3 V to 5.5 V.
- What is the maximum clock frequency of the PCA9555PW,118?
The maximum clock frequency is 400 kHz.
- How many I/O lines does the PCA9555PW,118 have?
The device has 16 I/O lines.
- What is the standby current consumption of the PCA9555PW,118?
The standby current consumption is 1 μA max.
- Does the PCA9555PW,118 have ESD protection?
- How are the I/O pins configured at power-up?
The I/O pins default to inputs with weak pull-up resistors at power-up.
- Can multiple PCA9555PW,118 devices share the same I2C-bus/SMBus?
- What type of interrupt output does the PCA9555PW,118 have?
The device has an open-drain active LOW interrupt output.
- Does the PCA9555PW,118 have noise filtering on its inputs?
