Datasheet

PCA9674_PCA9674A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 7 — 30 May 2013 7 of 40
NXP Semiconductors
PCA9674; PCA9674A
Remote 8-bit I/O expander for Fm+ I
2
C-bus with interrupt
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
DD
or V
SS
, the same address as the PCF8574 or
PCF8574A or the newer PCA8574 or PCA8574A is applied.
7.1.1 Address maps
The PCA9674 and PCA9674A are functionally the same, but have non-overlapping
address ranges. This allows 64 of the PCA9674 devices and 62 of the PCA9674A devices
to be on the same I
2
C-bus without address conflict.
Fig 6. PCA9674; PCA9674A address
R/W
002aab636
A6 A5 A4 A3 A2 A1 A0
programmable
slave address
Table 4. PCA9674 address map
Pin connectivity Address of PCA9674 Address byte value 7-bit
hexadecimal
address
without R/W
AD2 AD1 AD0 A6 A5 A4 A3 A2 A1 A0 R/W Write Read
V
SS
SCL V
SS
0010000 - 20h 21h 10h
V
SS
SCL V
DD
0010001 - 22h 23h 11h
V
SS
SDA V
SS
0010010 - 24h 25h 12h
V
SS
SDA V
DD
0010011 - 26h 27h 13h
V
DD
SCL V
SS
0010100 - 28h 29h 14h
V
DD
SCL V
DD
0010101 - 2Ah 2Bh 15h
V
DD
SDA V
SS
0010110 - 2Ch 2Dh 16h
V
DD
SDA V
DD
0010111 - 2Eh 2Fh 17h
V
SS
SCLSCL0011000 - 30h 31h 18h
V
SS
SCLSDA0011001 - 32h 33h 19h
V
SS
SDASCL0011010 - 34h 35h 1Ah
V
SS
SDASDA0011011 - 36h 37h 1Bh
V
DD
SCLSCL0011100 - 38h 39h 1Ch
V
DD
SCLSDA0011101 - 3Ah 3Bh 1Dh
V
DD
SDASCL0011110 - 3Ch 3Dh 1Eh
V
DD
SDASDA0011111 - 3Eh 3Fh 1Fh
V
SS
V
SS
V
SS
0100000 - 40h 41h 20h
V
SS
V
SS
V
DD
0100001 - 42h 43h 21h
V
SS
V
DD
V
SS
0100010 - 44h 45h 22h
V
SS
V
DD
V
DD
0100011 - 46h 47h 23h
V
DD
V
SS
V
SS
0100100 - 48h 49h 24h
V
DD
V
SS
V
DD
0100101 - 4Ah 4Bh 25h
V
DD
V
DD
V
SS
0100110 - 4Ch 4Dh 26h