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PCA9561

Quad 6-bit multiplexed I2C-bus EEPROM DIP switch

NXP Semiconductors. 

NXP Semiconductors

PCA9561

Quad 6-bit multiplexed I2C-bus EEPROM DIP switch

Table 11. Function table

This table is valid when not overridden by I2C-bus control register.

Input

Commands

WP

MUX_SELECT

0

X

Write to the non-volatile registers through I2C-bus allowed

1

X

Write to the non-volatile registers through I2C-bus not allowed

X

0

MUX_OUT_X from EEPROM byte 0 to byte 3 (EEPROM selected

through I2C-bus; refer to Table 5 “Commands register”)

X

1

MUX_OUT_X from MUX_IN_X inputs

6.5 Power-on reset

When power is applied to VDD, an internal Power-On Reset (POR) holds the PCA9561 in

a reset state until VDD has reached VPOR. At that point, the reset condition is released and

the PCA9561 volatile registers and state machine will initialize to their default states.

The MUX_OUT_X pin values depend on the MUX_SELECT logic level:

• If MUX_SELECT = 0, the MUX_OUT_X pin output values will equal the previously

stored EEPROM byte 0 values regardless of the last non-volatile EEPROM byte

selected by the command byte prior to power-down.

• If MUX_SELECT = 1, the MUX_OUT_X output values will equal the MUX_IN_X pin

input values as shown in Table 11 “Function table”.

PCA9561

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 4 — 6 November 2012

© NXP B.V. 2012. All rights reserved.

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