Philips Semiconductors

Product data

PCA9560

Dual 5-bit multiplexed 1-bit latched

2003 Jun 27

6

CONVERSION FROM THE PCA9559 TO THE PCA9560

The PCA9560 is a drop in replacement to the PCA9559 with no software modifications. The PCA9559 has only one MUX_SELECT pin to

choose between the MUX_IN values and the single non-volatile register. Since the PCA9560 has two internal non-volatile registers, if Register 1

is left to all 0’s (default condition) then the MUX_SELECT_1 pin can function the same as the PCA9559 OVERRIDE # pin and MUX_SELECT_0

pin can function the same as the PCA9559 MUX_IN pin.

EXTERNAL CONTROL SIGNALS

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.

(described in the next section).

The WP, MUX_IN*, MUX_SELECT_0, and MUX_SELECT_1 signals have internal pull-up resistors. See the DC and AC Characteristics for

hysteresis and signal spike suppression figures.

WP

MUX_SELECT_0

MUX_SELECT_1

COMMANDS

0

X

X

1

X

X

allowed

X

0

1

MUX_OUT and NON_MUXED_OUT (transparent) from

EEPROM byte 0

X

0

0

MUX_OUT and NON_MUXED_OUT (transparent) from

EEPROM byte 1

X

1

1

MUX_OUT from MUX_IN inputs and NON_MUXED_OUT

latched (from EEPROM 0)

X

1

0

MUX_OUT from MUX_IN inputs and NON_MUXED_OUT

latched (from EEPROM 1)

NOTE:

POWER-ON RESET (POR)

The MUX_OUT and NON_MUXED_OUT pin values depend on:

- the MUX_SELECT_0 and MUX_SELECT_1 logic levels, selecting either the MUX_IN input pins or one of the two 6-bit EEPROMs

- the previously stored values in the EEPROM registers/current MUX_IN pin values as shown in the Function Table