Overview
The PCA9501PW, produced by NXP USA Inc., is an 8-bit I/O expander integrated with a 2-kbit EEPROM. This device is designed to expand the I/O capabilities of a microcontroller or other system master through an I2C-bus or SMBus interface. The PCA9501 features eight quasi-bidirectional data pins that can be independently configured as inputs or outputs, allowing for monitoring of board-level status or activation of indicator devices such as LEDs. The on-board EEPROM is useful for storing error codes, board manufacturing data, or other configuration information that can be read back by application software for diagnostic purposes.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD supply voltage | 2.5 | 3.3 | 3.6 | V | |
| IDDQ standby current | A0 to A5; WC = HIGH | - | - | 60 µA | A |
| IDD1 supply current read | - | - | 1 mA | A | |
| IDD2 supply current write | - | - | 2 mA | A | |
| VPOR power-on reset voltage | - | - | 2.4 V | V | |
| VIL LOW-level input voltage | -0.5 | - | 0.3VDD | V | |
| VIH HIGH-level input voltage | 0.7VDD | - | 5.5 V | V | |
| IOL LOW-level output current | VOL = 0.4 V | 3 | - | 20 mA | A |
| IOH HIGH-level output current | VOH = 0.4 V | -20 | - | -60 mA | A |
| Clock frequency | 0 Hz | - | 400 kHz | Hz | |
| ESD protection | - | - | 2000 V HBM, 200 V MM, 1000 V CDM | V | |
| Package types | - | - | SO20, TSSOP20, HVQFN20 |
Key Features
- 8-bit I/O expander with on-board 2-kbit EEPROM
- Eight quasi-bidirectional data pins configurable as inputs or outputs
- I2C-bus and SMBus interface logic
- Internal power-on reset and noise filter on SCL/SDA inputs
- Active LOW interrupt output
- Six address pins allowing up to 64 devices on the I2C-bus/SMBus
- Supports hot insertion
- Low standby current and operating power supply voltage range of 2.5 V to 3.6 V
- 5 V tolerant inputs/outputs
- Self-timed write cycle (5 ms typical) and 16 byte page write operation
- No glitch on power-up and power-up with all channels configured as inputs
Applications
- Board version tracking and configuration
- Board health monitoring and status reporting
- Multi-card systems in telecom, networking, and base station infrastructure equipment
- Field recall and troubleshooting functions for installed boards
- General-purpose integrated I/O with memory
Q & A
- What is the PCA9501PW?
The PCA9501PW is an 8-bit I/O expander with an on-board 2-kbit EEPROM, designed for expanding the I/O capabilities of a microcontroller or system master through an I2C-bus or SMBus interface.
- What are the key features of the PCA9501PW?
Key features include 8-bit I/O expansion, on-board 2-kbit EEPROM, I2C-bus and SMBus interface, internal power-on reset, active LOW interrupt output, and support for hot insertion.
- What is the operating voltage range of the PCA9501PW?
The operating power supply voltage range is from 2.5 V to 3.6 V.
- How many devices can be connected on the same I2C-bus/SMBus?
Up to 64 devices can be connected on the same I2C-bus/SMBus due to the six address pins with internal pull-up resistors.
- What is the purpose of the on-board EEPROM?
The on-board EEPROM is used to store error codes, board manufacturing data, or other configuration information that can be read back by application software for diagnostic purposes.
- What are the package types available for the PCA9501PW?
The PCA9501PW is available in SO20, TSSOP20, and HVQFN20 packages.
- Does the PCA9501PW support hot insertion?
Yes, the PCA9501PW supports hot insertion, making it suitable for use in removable cards on backplane systems.
- What is the clock frequency range of the PCA9501PW?
The clock frequency range is from 0 Hz to 400 kHz.
- What is the ESD protection level of the PCA9501PW?
The ESD protection exceeds 2000 V HBM, 200 V MM, and 1000 V CDM.
- How does the PCA9501PW handle power-up configuration?
The PCA9501PW powers up with all channels configured as inputs and has no glitch on power-up.
