Application Note (5)
Data Sheet (1)
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PCA9698 demonstration board OM6281[UM10267]
Compact List
- No Longer Manufactured
- PCA9558PW
8-bit I²C-bus and SMBus I/O port
- This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.
The PCA9558 is a highly integrated, multi-function device that is composed of a 5-bit multiplexed/1-bit latched 6-bit I²C-bus/SMBus EEPROM DIP switch, an 8-bit I/O expander and a 2-kbit serial EEPROM with write protect. The PCA9558 integrates these commonly used components into a single chip to reduce component count and board space requirements and is useful in computer, server and telecom/networking applications.
- Multiplexed/latched EEPROM DIP switch — used to select digital information between a set of 5 bits of default hardware inputs and an alternative set of inputs provided by the I²C-bus/SMBus interface and stored in the EEPROM. Examples of this type of selection include processor voltage configuration or processor vendor identification (VID). The multiplexed/latched EEPROM can also be used to replace DIP switches or jumpers since the settings can be easily changed via I²C-bus/SMBus without having to power down the equipment to open the cabinet. The non-volatile memory retains the most current setting selected before the power is turned off.
- 8-bit I/O expander — used to control, monitor or collect remote information or power LEDs. Monitored or collected information can be read through the I²C-bus/SMBus or can be stored in the internal EEPROM.
- 2-kbit serial EEPROM — used to store information such as card identification or revision/maintenance history on every motherboard/line card and can be read or written via I²C-bus/SMBus when required.
The PCA9558 has one address pin, allowing up to two devices to be placed on the same I²C-bus or SMBus.
Buy/Parametrics
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Exclude 1 NRND
Part | CAD Model | No of bits | VDD [min] | VDD [max] | Over volt tolerant | No of supplies | Max Sink Current per bit (mA) | Max Sink Current, per package (mA) | Output mode | Internal pull-up resistor per bit (kOhm) | I2C-bus (kHz) | Footprint body and leads | Package Type | Operating Temperature (°C) | No of Addresses | Remark |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
8 | 3 | 3.6 | Y | 1 | 4 | 32 | Open drain | Int I source | 400 | 64.68 | TSSOP28 | 0~70 | 2 | EEPROM 2K byte, DIP switch |
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PCA9698 demonstration board OM6281[UM10267]
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