Quad 6-bit multiplexed I2C EEPROM DIP switch
The PCA9561 is a 20-pin CMOS device consisting of four 6-bit non-volatile EEPROM registers, six hardware pin inputs and a 6-bit multiplexed output. It is used for DIP switch-free or jumper-less system configuration and supports Mobile and Desktop VID Configuration, where five preset values (four sets of internal non-volatile registers and one set of external hardware pins) set processor voltage for operation in various performance or battery conservation sleep modes. The PCA9561 is also useful in server and telecommunications/networking applications when 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.
The PCA9561 typically resides between the CPU and Voltage Regulator Module (VRM) when used for CPU VID (Voltage IDentification code) configuration. It is used to bypass the CPU-defined VID values and provide a different set of VID values to the VRM, if an increase in the CPU voltage is desired. An increase in CPU voltage combined with an increase in CPU frequency leads to a performance boost of up to 7.5 %. Lower CPU voltage reduces power consumption. The main advantage of the PCA9561 over older devices, such as the PCA9559 or PCA9560, is that it contains four internal non-volatile EEPROM registers instead of just one or two, allowing five independent settings which allows a more accurate CPU voltage tuning depending on specific applications.
The PCA9561 has two address pins, allowing up to four devices to be placed on the same I²C-bus or SMBus.
|Type number||Package||I2C-bus(kHz)||Operating voltage(VDC)||# of Outputs/Latched Outputs/Internal EEPROM Registers||Max Sink Current per bit(mA)||# of Addresses||Max Sink Current, per package(mA)||Operating Temperature(Cel)|
|Package Version||Package Name||Package Description||Reference Codes||Issue Date|
|SOT360-1||TSSOP20||plastic thin shrink small outline package; 20 leads; body width 4.4 mm||MO-153 (JEDEC);||2003-02-19|
|Type number||Ordering code (12NC)||Orderable part number||Region||Distributor||In stock||Order quantity||Inventory date||Buy online||Samples|
|PCA9561PW||9352 717 09112||PCA9561PW,112||EU||AVNET EXPRESS EUROPE||1,050||6/17/2013||not available|
|PCA9561PW||9352 717 09118||PCA9561PW,118||NA||MOUSER ELECTRONICS||2,500||6/15/2013|
|JAPAN||CHIP ONE STOP||30||06/17/2013|
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