Overview
The PCA9555DB,112 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 for expanding the I/O capabilities of microcontrollers in various applications such as ACPI power switches, sensors, push buttons, LEDs, and fans.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 24-SOIC (0.295", 7.50mm Width) |
| Supply Voltage | 2.3 V to 5.5 V |
| Operating Temperature | -40°C to 85°C |
| Number of I/O | 16 |
| Interface | I²C, SMBus |
| Clock Frequency | 0 Hz to 400 kHz |
| Output Type | Push-Pull |
| Output Current | 10mA (source), 25mA (sink) |
| Interrupt Output | Yes, Active LOW |
| ESD Protection | 2000 V HBM, 200 V MM, 1000 V CDM |
Key Features
- Low standby current consumption of 1 μA max
- 5 V tolerant I/O ports
- Polarity Inversion register
- Open-drain active-low interrupt output
- Latched outputs with high-current drive capability for directly driving LEDs
- No glitch on power-up and internal power-on reset
- Noise filter on SCL/SDA inputs
- Address by three hardware address pins for use of up to eight devices
- ESD protection exceeds JESD 22 standards
Applications
The PCA9555DB,112 is suitable for a variety of applications, including servers, industrial control systems, and any scenario where additional I/O expansion is required. It can be used to control and monitor devices such as ACPI power switches, sensors, push buttons, LEDs, and fans.
Q & A
- What is the PCA9555DB,112 used for?
The PCA9555DB,112 is used for expanding the I/O capabilities of microcontrollers via I²C-bus/SMBus. - What is the operating voltage range of the PCA9555DB,112?
The operating voltage range is from 2.3 V to 5.5 V. - How many I/O pins does the PCA9555DB,112 provide?
The device provides 16 general-purpose input/output (GPIO) pins. - What is the maximum clock frequency supported by the PCA9555DB,112?
The maximum clock frequency is 400 kHz. - Does the PCA9555DB,112 have interrupt capabilities?
Yes, it has an open-drain active-low interrupt output. - What kind of ESD protection does the PCA9555DB,112 offer?
The device offers ESD protection exceeding 2000 V HBM, 200 V MM, and 1000 V CDM. - Can multiple PCA9555DB,112 devices share the same I²C-bus/SMBus?
Yes, up to eight devices can share the same bus using three hardware address pins. - What is the output current capability of the PCA9555DB,112?
The output current capability is 10mA (source) and 25mA (sink). - Does the PCA9555DB,112 have a power-on reset feature?
Yes, it has an internal power-on reset feature. - What is the operating temperature range of the PCA9555DB,112?
The operating temperature range is from -40°C to 85°C.
