參數(shù)資料
型號(hào)： PCA9674
廠商： NXP Semiconductors N.V.
英文描述： Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt
中文描述： 遠(yuǎn)程8位I / O擴(kuò)展調(diào)頻I2C總線的中斷
文件頁(yè)數(shù)： 13/34頁(yè)
文件大?。?/td> 179K
代理商： PCA9674
PCA9674_PCA9674A_2
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 12 October 2006
13 of 34
NXP Semiconductors
PCA9674/74A
Remote 8-bit I/O expander for Fm+ I
2
C-bus with interrupt
8.
I/O programming
8.1 Quasi-bidirectional I/O architecture
The PCA9674/74A’s 8 ports (see
Figure 2
) are entirely independent and can be used
either as input or output ports. Input data is transferred from the ports to the
microcontroller in the Read mode (see
Figure 15
). Output data is transmitted to the ports
in the Write mode (see
Figure 14
).
This quasi-bidirectional I/O can be used as an input or output without the use of a control
signal for data directions. At power-on the I/Os are HIGH. In this mode only a current
source (I
OH
) to V
DD
is active. An additional strong pull-up to V
DD
(I
trt(pu)
) allows fast rising
edges into heavily loaded outputs. These devices turn on when an output is written HIGH,
and are switched off by the negative edge of SCL. The I/Os should be HIGH before being
used as inputs. After power-on, as all the I/Os are set HIGH, all of them can be used as
inputs. Any change in setting of the I/Os as either inputs or outputs can be done with the
write mode.
Remark:
If a HIGH is applied to an I/O which has been written earlier to LOW, a large
current (I
OL
) will flow to V
SS
.
8.2 Writing to the port (Output mode)
To write, the master (microcontroller) first addresses the slave device. By setting the last
bit of the byte containing the slave address to logic 0 the write mode is entered. The
PCA9674/74A acknowledges and the master sends the data byte for P7 to P0 and is
acknowledged by the PCA9674/74A. The 8-bit data is presented on the port lines after it
has been acknowledged by the PCA9674/74A.
The number of data bytes that can be sent successively is not limited. The previous data
is overwritten every time a data byte has been sent.
If more than 2 bytes are read, the slave device loops back to the first byte (manufacturer byte)
and keeps sending data until the master generates a ‘no acknowledge’.
Fig 13. Device ID field reading
002aac119
1
1
1
1
0
0
0
A
S
1
device ID address
START condition
R/W
acknowledge from one
or several slave(s)
A5 A4 A3 A2 A1 A0 X
A6
A
1
1
1
1
0
0
1
1
device ID address
A
I
2
C-bus slave address of
the device to be identified
don't care
acknowledge from
slave to be identified
acknowledge from
slave to be identified
R/W
M6 M5 M4
M7
M2 M1 M0
M3
A
acknowledge
from master
C5 C4 C3
C6
C1 C0 F5
C2
A
acknowledge
from master
manufacturer name
= 00000000
P3 P2 P1
F4
P0 R2 R1 R0
revision = 000
feature identification
= 001011
A
P
STOP
condition
no acknowledge
from master
category identification
= 0000001
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