Overview
The PCA9500PW, produced by NXP USA Inc., is an 8-bit I/O expander integrated circuit that includes an on-board 2-kbit EEPROM. This device is designed to expand the I/O capabilities of a microcontroller or other system leader via the I²C-bus or SMBus protocol. The PCA9500PW allows for the independent assignment of its eight quasi-bidirectional data pins as either inputs or outputs, making it versatile for monitoring board level status or activating indicator devices such as LEDs.
Key Specifications
| Parameter | Value |
|---|---|
| Number of I/O Pins | 8 |
| EEPROM Capacity | 2 kbit |
| Bus Interface | I²C-bus, SMBus |
| Address Pins | 3 (with internal pull-up resistors) |
| Maximum Number of Devices on Bus | 8 |
| Package Types | PCA9500BS, PCA9500D, PCA9500PW |
| Hot Insertion Capability | Yes |
Key Features
- Eight quasi-bidirectional I/O pins that can be independently assigned as inputs or outputs.
- On-board 2-kbit EEPROM for storing error codes, board manufacturing data, or other diagnostic information.
- Support for I²C-bus and SMBus protocols with fixed GPIO and EEPROM addresses.
- Hot insertion capability, making it suitable for use in removable cards on backplane systems.
- Internal pull-up resistors on address pins, allowing up to eight devices to share the same bus.
Applications
The PCA9500PW is suitable for various applications where I/O expansion is necessary, such as in industrial control systems, medical devices, consumer electronics, and automotive systems. It is particularly useful in scenarios where additional I/O lines are required to monitor or control external devices, and where the storage of configuration or diagnostic data is needed.
Q & A
- What is the PCA9500PW? The PCA9500PW is an 8-bit I/O expander with an on-board 2-kbit EEPROM, designed to expand the I/O capabilities of a microcontroller or system leader.
- What bus protocols does the PCA9500PW support? The PCA9500PW supports I²C-bus and SMBus protocols.
- How many I/O pins does the PCA9500PW have? The PCA9500PW has eight quasi-bidirectional I/O pins.
- What is the capacity of the EEPROM in the PCA9500PW? The EEPROM capacity is 2 kbit.
- Can multiple PCA9500PW devices share the same bus? Yes, up to eight devices can share the same bus due to the three address pins with internal pull-up resistors.
- Does the PCA9500PW support hot insertion? Yes, it supports hot insertion, making it suitable for use in removable cards on backplane systems.
- What are the package types available for the PCA9500PW? The available package types are PCA9500BS, PCA9500D, and PCA9500PW.
- How are the I/O pins configured? The I/O pins can be independently assigned as inputs or outputs by writing to the I/O configuration bits.
- What kind of data can be stored in the EEPROM? The EEPROM can store error codes, board manufacturing data, or other diagnostic information.
- Is the PCA9500PW suitable for automotive applications? Yes, it can be used in automotive systems where additional I/O lines and data storage are required.
