PCA8575BQ PHILIPS [NXP Semiconductors], PCA8575BQ Datasheet - Page 6

• Manufacturer Part Number: PCA8575BQ
• Description: Remote 16-bit I/O expander for I2C-bus with interrupt
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
7. Functional description
PCA8575_1
Objective data sheet
7.1.1 Address map
7.1 Device address
Refer to
Following a START condition, the bus master must send the address of the slave it is
accessing and the operation it wants to perform (read or write). The address of the
PCA8575 is shown in
8 slave addresses. To conserve power, no internal pull-up resistors are incorporated on
AD2, AD1, and AD0. Address values depending on AD2, AD1, and AD0 can be found in
Table 3 “PCA8575 address
Remark: The General Call address (0000 0000b) and the Device ID address
(1111 100Xb) are reserved and cannot be used as device address. Failure to follow this
requirement will cause the PCA8575 not to acknowledge.
The last bit of the first byte defines the operation to be performed. When set to logic 1 a
read is selected, while a logic 0 selects a write operation.
When AD2, AD1 and AD0 are held to V
applied.
Table 3.
A6
0
0
0
0
0
0
0
0
Fig 9. PCA8575 address
Figure 1 “Block diagram of
A5
1
1
1
1
1
1
1
1
PCA8575 address map
A4
0
0
0
0
0
0
0
0
Rev. 01 — 30 November 2006
Figure
A3
0
0
0
0
0
0
0
0
map”.
9. Slave address pins AD2, AD1, and AD0 choose 1 of
A6
Remote 16-bit I/O expander for I
A5
A2
0
0
0
0
1
1
1
1
PCA8575”.
programmable
slave address
A4
DD
A3
A1
0
0
1
1
0
0
1
1
or V
A2
SS
, the same address as the PCF8575 is
A1
A0
0
1
0
1
0
1
0
1
A0
002aab636
R/W
Address (hex)
20h
21h
22h
23h
24h
25h
26h
27h
2
C-bus with interrupt
PCA8575
© NXP B.V. 2006. All rights reserved.
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