Overview
The PCA9555AHF,128 is a 16-bit I2C-bus and SMBus low-power I/O expander produced by NXP USA Inc. This device is designed to provide additional I/Os while minimizing interconnections, making it ideal for various applications such as ACPI power switches, sensors, push buttons, LEDs, and fan control. The PCA9555AHF,128 operates over a wide supply voltage range of 1.65V to 5.5V, allowing it to interface with next-generation microprocessors and microcontrollers where supply levels are dropping to conserve power.
Key Specifications
| Attribute | Value |
|---|---|
| Manufacturer | NXP USA Inc. |
| Part Number | PCA9555AHF,128 |
| Number of Pins | 24 |
| Package Type | HWQFN-24-EP (4x4) |
| Mounting Type | Surface Mount |
| Number of I/Os | 16 |
| Interface | I2C, SMBus |
| Frequency | 400kHz |
| Supply Voltage Range | 1.65V to 5.5V |
| Operating Temperature Range | -40°C to 85°C |
| Output Current | 25mA |
| Interrupt Output | Yes (Open-drain active LOW) |
| RoHS Compliance | Yes |
Key Features
- I2C-bus to parallel port expander with 400kHz fast-mode capability
- Open-drain active LOW interrupt output (INT)
- Schmitt-trigger action for better switching noise immunity at SCL, SDA inputs
- Internal power-on reset
- 5V tolerant I/Os with no glitch on power-up
- Power-up with all channels configured as inputs with weak pull-up resistors
- Latched outputs with 25mA drive maximum capability for directly driving LEDs
- Latch-up performance exceeds 100mA per JESD78, Class II
- ESD protection exceeds JESD22 2000V Human Body Model (A114-A) and 1000V Charged-Device Model (C101)
Applications
- Industrial automation and control systems
- Home and building automation
- Embedded systems and IoT devices
- Sensor and actuator interface
- ACPI power switches, sensors, push buttons, LEDs, and fan control
Q & A
- What is the PCA9555AHF,128 used for?
The PCA9555AHF,128 is used as a 16-bit I2C-bus and SMBus low-power I/O expander to provide additional I/Os in various applications.
- What is the operating voltage range of the PCA9555AHF,128?
The operating voltage range is from 1.65V to 5.5V.
- What type of interface does the PCA9555AHF,128 support?
The PCA9555AHF,128 supports I2C and SMBus interfaces.
- What is the maximum frequency of the I2C-bus for the PCA9555AHF,128?
The maximum frequency is 400kHz.
- Does the PCA9555AHF,128 have an interrupt output?
Yes, it has an open-drain active LOW interrupt output.
- What is the maximum output current of the PCA9555AHF,128?
The maximum output current is 25mA.
- Is the PCA9555AHF,128 RoHS compliant?
Yes, it is RoHS compliant.
- What is the operating temperature range of the PCA9555AHF,128?
The operating temperature range is from -40°C to 85°C.
- What type of package does the PCA9555AHF,128 come in?
The PCA9555AHF,128 comes in a HWQFN-24-EP (4x4) package.
- Does the PCA9555AHF,128 have ESD protection?
Yes, it has ESD protection exceeding JESD22 2000V Human Body Model (A114-A) and 1000V Charged-Device Model (C101).
