Overview
The PCA9559PW/G,118 is a 20-pin CMOS device manufactured by NXP USA Inc. This component is designed to provide a flexible and programmable solution for system configuration, particularly in applications where DIP switches or jumpers are traditionally used. It features one 6-bit non-volatile EEPROM register, 5 hardware pin inputs, and a 5-bit multiplexed output along with one latched output. This device is highly useful in various configurations, including CPU VID (Voltage IDentification code) configuration, and supports both mobile and desktop systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| HIGH-level input voltage (SCL, SDA) | 2.7 | 4.0 | V | |
| LOW-level input voltage (SCL, SDA) | -0.5 | 0.9 | V | |
| LOW-level output voltage (IOL = 6 mA) | 0.6 | V | ||
| LOW-level output current (MUX_OUT, NON_MUXED_OUT) | 8 | mA | ||
| Input capacitance | 10 | pF | ||
| Memory cell data retention | 10 | years | ||
| Number of memory cell write cycles | 100,000 | cycles |
Key Features
- 5-bit 2-to-1 multiplexer and 1-bit latch for DIP switch functionality
- 6-bit internal non-volatile register programmable and readable via I2C-bus
- 5 open drain multiplexed outputs and 1 open drain non-multiplexed (latched) output
- 5 V and 2.5 V tolerant inputs/outputs
- Override input forces all outputs to logic 0
- 2 address pins allowing up to 4 devices on the same I2C-bus or SMBus
Applications
The PCA9559PW/G,118 is particularly useful in several applications, including:
- CPU VID (Voltage IDentification code) configuration for both mobile and desktop systems, allowing for performance or deep sleep modes.
- Server and telecom/networking applications to replace DIP switches or jumpers, enabling easy configuration changes via I2C/SMBus without powering down the equipment.
- Jumperless configuration of PC motherboards.
Q & A
- What is the PCA9559PW/G,118 used for? The PCA9559PW/G,118 is used for DIP switch-free or jumper-less system configuration and supports CPU VID configuration.
- How many devices can be placed on the same I2C-bus? Up to 4 devices can be placed on the same I2C-bus due to the 2 address pins.
- What is the memory cell data retention of the PCA9559PW/G,118? The memory cell data retention is a minimum of 10 years.
- How many write cycles can the memory cell handle? The memory cell can handle a minimum of 100,000 write cycles.
- What are the input voltage levels for SCL and SDA pins? The HIGH-level input voltage is between 2.7 V and 4.0 V, and the LOW-level input voltage is between -0.5 V and 0.9 V.
- What is the purpose of the override input? The override input forces all outputs to logic 0.
- Is the PCA9559PW/G,118 suitable for server and telecom applications? Yes, it is suitable for these applications as it can replace DIP switches or jumpers and allow configuration changes without powering down the equipment.
- What are the typical applications of the PCA9559PW/G,118 in PC systems? It is used for jumperless configuration of PC motherboards.
- How does the PCA9559PW/G,118 affect CPU performance and power consumption? It can increase CPU voltage for a performance boost or reduce CPU voltage to lower power consumption.
- What is the significance of the 5-bit multiplexed output and 1-bit latched output? The 5-bit multiplexed output and 1-bit latched output provide flexible configuration options for system settings.
