Overview
The PCA9559PW,112 is a 20-pin CMOS device manufactured by NXP USA Inc. This component is designed to provide a flexible solution for system configuration and control, particularly in applications where DIP switches or jumpers are traditionally used. It features a combination of non-volatile EEPROM registers, hardware pin inputs, and multiplexed outputs, making it suitable for various electronic systems.
Key Specifications
| Parameter | Description |
|---|---|
| Package Type | 20-pin TSSOP |
| EEPROM Registers | 6-bit non-volatile |
| Hardware Pin Inputs | 5 pins |
| Multiplexed Outputs | 5-bit multiplexed, 1-bit latched |
| Input/Output Voltage Tolerance | 5 V and 2.5 V tolerant |
| Address Pins | 2 pins, allowing up to 4 devices on the I²C-bus |
| Power-On Reset | Internal POR holds the device in reset state until VCC reaches VPOR |
| Operating Conditions | VCC: 2.3 V to 5.5 V, Temperature: -40°C to 85°C |
Key Features
- 5-bit 2-to-1 multiplexer and 1-bit latch for DIP switch functionality
- Internal non-volatile register programmable and readable via I²C-bus
- Override input forces all outputs to logic 0
- 5 open drain multiplexed outputs and 1 open drain non-multiplexed (latched) output
- Useful for ‘jumperless’ configuration of PC motherboards and other electronic systems
Applications
The PCA9559PW,112 is particularly useful in several applications, including:
- Server and telecom/networking systems to replace DIP switches or jumpers, allowing settings to be changed via I²C/SMBus without powering down the equipment.
- Mobile and desktop systems for CPU VID (Voltage IDentification code) configuration, enabling the adjustment of CPU voltage for performance or power-saving modes.
- General system configuration where the need for physical switches or jumpers is eliminated.
Q & A
- What is the PCA9559PW,112 used for? The PCA9559PW,112 is used for system configuration and control, replacing traditional DIP switches or jumpers with programmable I²C-bus controlled outputs.
- How many devices can be connected on the same I²C-bus? Up to 4 devices can be connected on the same I²C-bus due to the 2 address pins.
- What is the purpose of the non-volatile EEPROM registers? The non-volatile EEPROM registers store settings that are retained even when power is turned off.
- What are the operating voltage and temperature ranges for the PCA9559PW,112? The operating voltage range is 2.3 V to 5.5 V, and the temperature range is -40°C to 85°C.
- How does the override input function work? The override input forces all outputs to logic 0.
- What types of outputs does the PCA9559PW,112 have? It has 5 open drain multiplexed outputs and 1 open drain non-multiplexed (latched) output.
- Is the PCA9559PW,112 suitable for mobile and desktop systems? Yes, it is used for CPU VID configuration in these systems.
- What is the benefit of using the PCA9559PW,112 in server and telecom/networking systems? It allows settings to be changed via I²C/SMBus without powering down the equipment.
- How does the power-on reset function work? The internal POR holds the device in reset state until VCC reaches VPOR.
- What is the significance of the 5-bit multiplexed output? It allows for flexible output configuration and control.
