PCA9559 查看數據表（PDF） - Philips Electronics
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PCA9559 Datasheet PDF : 10 Pages
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Philips Semiconductors
5-bit multiplexed/1-bit latched 6-bit I2C EEPROM
Product specification
PCA9559
PIN DESCRIPTION
PIN
NUMBER
1
2
SYMBOL
I2C SCL
I2C SDA
Serial I2C bus clock
Serial bi-directional I2C bus data
FUNCTION
3
A1 Address
A1
4
A0 Address
A0
5
MUX_IN A
6
MUX_IN B
7
MUX_IN C
External inputs to multiplexer
8
MUX_IN D
9
MUX_IN E
10
GND
Ground
11
MUX_SELECT Selects MUX_IN inputs or register contents for MUX_OUT outputs
12
MUX_OUT E
13
MUX_OUT D
14
MUX_OUT C
Open drain multiplexed outputs
15
MUX_OUT B
16
MUX_OUT A
17
NON_MUXED_OUT Open drain outputs from non-volatile memory
18
OVERRIDE#
Forces all outputs to logic 0
19
WP
Non-volatile register write-protect
20
VCC
Positive voltage rail
I2C INTERFACE
Communicating with this device is initiated by sending a valid address on the I2C bus. The address format (see FIgure 1) has 5 fixed bits and
two user-programmable bits followed by a 1-bit read/write value which determines the direction of the data transfer.
MSB
LSB
1
0
0
1
1
A1
A0
R/W#
Figure 1. I2C Address Byte
SW00218
Following the address and acknowledge bit are 8 data bits which, depending on the read/write bit in the address, will read data from or write
data to the non-volatile register. Data will be written to the register if the read/write bit is logic 0 and the WP input is logic 0. Data will be read
from the register if the bit is logic 1. The four high-order bits are latched outputs, while the four low order bits are multiplexed outputs (Figure 2).
NOTE:
1. To ensure data integrity, the non-volatile register must be internally write protected when VCC to the I2C bus is powered down or VCC to the
component is dropped below normal operating levels.
MSB
0
0
Non_muxed
Data
Mux
Data E
Mux
Data D
Mux
Data C
Figure 2. I2C Data Byte
Mux
Data B
LSB
Mux
Data A
SW00456
2000 Jan 31
3
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