PCA9561 datasheet(6/17 Pages) PHILIPS

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Philips Semiconductors

Product data sheet

PCA9561

Quad 6-bit multiplexed I2C EEPROM DIP switch

2004 May 17

EXTERNAL CONTROL SIGNALS

The Write Protect (WP) input is used to control the ability to write the content of the non-volatile registers. If the WP signal is logic 0, the I2C-bus

will be able to write the contents of the non-volatile registers. If the WP signal is logic 1, data will not be allowed to be written into the

non-volatile registers. In this case, the slave address and the command code will be acknowledged but the following data bytes will not be

acknowledged and the EEPROM is not updated.

The factory default for the contents of the non-volatile register are all logic 0. These stored values can be read or written using the I2C-bus

(described in the next section).

The WP, MUX_IN*, and MUX_SELECT signals have internal pull-up resistors. See the DC and AC Characteristics for hysteresis and signal

spike suppression figures.

Function Table1

MUX_SELECT

COMMANDS

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

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

MUX_OUT from EEPROM byte 0–3

(EEPROM selected through I2C – see Table 2)

MUX_OUT from MUX_IN inputs

NOTE:

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

POWER-ON RESET (POR)

When power is applied to VDD, an internal power-on reset 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 pin values depend on the MUX_SELECT logic level:

– if MUX_SELECT = 0, the MUX_OUT pin output values will equal the previously stored EEPROM byte 0 values regardless of the last

non-volative EEPROM byte selected by the command byte prior to power down.

– if MUX_SELECT = 1, the MUX_OUT output values will equal the MUX_IN pin input values as shown in the Function Table.

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