參數(shù)資料
型號(hào)： PCA9674ABS
廠商： NXP Semiconductors N.V.
元件分類： I2C/I2S
英文描述： Remote 8-bit I-O expander for Fm+ I2C-bus with interrupt
封裝： PCA9674ABS<SOT758-1 (HVQFN16)|<<http://www.nxp.com/packages/SOT758-1.html<1<Always Pb-free,;PCA9674AD<SOT162-1 (SO16)|<<http://www.nxp.com/packages/SOT162-1.html<1<
文件頁數(shù)： 6/32頁
文件大?。?/td> 299K
代理商： PCA9674ABS
PCA9674_PCA9674A
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 6 — 29 September 2011
6 of 32
NXP Semiconductors
PCA9674; PCA9674A
Remote 8-bit I/O expander for Fm+ I
2
C-bus with interrupt
7. Functional description
Refer to
Figure 1 “Block diagram of PCA9674; PCA9674A”
.
7.1 Device address
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
PCA9674; PCA9674A is shown in
Figure 6
. Slave address pins AD2, AD1, and AD0
choose 1 of 64 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 4 “PCA9674 address map”
and
Table 5 “PCA9674A address map”
.
Remark:
When using the PCA9674A, 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 PCA9674A not to acknowledge.
Remark:
When using the PCA9674 or the PCA9674A, reserved I
2
C-bus addresses must
be used with caution since they can interfere with:
“reserved for future use” I
2
C-bus addresses (0000 011, 1111 101, 1111 110, 1111 111)
slave devices that use the 10-bit addressing scheme (1111 0xx)
High speed mode (Hs-mode) master code (0000 1xx)
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 is applied.
7.1.1
Address maps
Table 4.
AD2
V
SS
V
SS
V
SS
V
SS
V
DD
V
DD
V
DD
V
DD
Fig 6.
PCA9674; PCA9674A address
R/W
002aab636
A6
A5
A4
A3
A2
A1
A0
programmable
slave address
PCA9674 address map
AD1
AD0
SCL
V
SS
SCL
V
DD
SDA
V
SS
SDA
V
DD
SCL
V
SS
SCL
V
DD
SDA
V
SS
SDA
V
DD
A6
0
0
0
0
0
0
0
0
A5
0
0
0
0
0
0
0
0
A4
1
1
1
1
1
1
1
1
A3
0
0
0
0
0
0
0
0
A2
0
0
0
0
1
1
1
1
A1
0
0
1
1
0
0
1
1
A0
0
1
0
1
0
1
0
1
Address
20h
22h
24h
26h
28h
2Ah
2Ch
2Eh
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