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PCA9561 Datasheet PDF : 26 Pages
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NXP Semiconductors
PCA9561
Quad 6-bit multiplexed I2C-bus EEPROM DIP switch
Table 5. Commands register
All other combinations are reserved.
Command value
D7 D6 D5 D4 D3 D2 D1 D0
1
1
1
1
0
0
0
0
1
1
1
1
0
1
0
0
1
1
1
1
1
0
0
0
1
1
1
1
1
1
0
0
1
1
1
1
0
0
0
1
1
1
1
1
0
1
0
1
1
1
1
1
1
0
0
1
1
1
1
1
1
1
0
1
1
1
1
1
X
X
1
0
Command function
MUX_SELECT = 1
MUX_SELECT = 0
EEPROM byte 0
EEPROM byte 0
EEPROM byte 1
EEPROM byte 1
EEPROM byte 2
EEPROM byte 2
EEPROM byte 3
EEPROM byte 3
MUX_IN
EEPROM byte 0
MUX_IN
EEPROM byte 1
MUX_IN
EEPROM byte 2
MUX_IN
EEPROM byte 3
MUX_IN
MUX_IN
6.3 Register description
If the Control register byte is an EEPROM address, the next byte will be programmed into
that EEPROM address on the following STOP condition, if WP is logic 0. If more than one
byte is sent sequentially, the second byte will be written in the other volatile register, on
the following STOP condition. Up to four bytes can be sent sequentially. If any more data
bytes are sent after the fourth byte, they will not be acknowledged and no bytes will be
written to the non-volatile registers. After a byte is read from or written to the EEPROM,
the part automatically points to the next non-volatile register. If the Command register
code was FFh, the MUX_IN values are sent with the two MSBs padded with zeros as
shown below. If the command register code is 00h, then the non-volatile register 0 is sent.
If the command register code is 01h, then the non-volatile register 1 is sent. If the
command register code is 02h, then the non-volatile register 2 is sent. If the command
register code is 03h, then the non-volatile register 3 is sent.
Table 6.
Write
Read
Default
EEPROM byte 0 register
D7
D6
D5
X
X
EEPROM 0
data F
0
0
EEPROM 0
data F
0
0
0
D4
EEPROM 0
data E
EEPROM 0
data E
0
D3
EEPROM 0
data D
EEPROM 0
data D
0
D2
EEPROM 0
data C
EEPROM 0
data C
0
D1
EEPROM 0
data B
EEPROM 0
data B
0
D0
EEPROM 0
data A
EEPROM 0
data A
0
Table 7.
Write
Read
Default
EEPROM byte 1 register
D7
D6
D5
X
X
EEPROM 1
data F
0
0
EEPROM 1
data F
0
0
0
D4
EEPROM 1
data E
EEPROM 1
data E
0
D3
EEPROM 1
data D
EEPROM 1
data D
0
D2
EEPROM 1
data C
EEPROM 1
data C
0
D1
EEPROM 1
data B
EEPROM 1
data B
0
D0
EEPROM 1
data A
EEPROM 1
data A
0
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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