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参数资料
| 型号： | 935271979118 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8 I/O, PIA-GENERAL PURPOSE, PQCC16 |
| 封装： | 4 X 4 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT-629-1, HVQFN-16 |
| 文件页数： | 13/15页 |
| 文件大小： | 140K |
| 代理商： | 935271979118 |
Philips Semiconductors
Product data
PCA9554/PCA9554A
8-bit I2C and SMBus I/O port with interrupt
2002 Jul 26
7
0
A2
A1 A0
0
1
0
A2
A1
A0
0
1
S0
A
COMMAND BYTE
acknowledge
from slave
R/W
acknowledge
from slave
A
P
NA
acknowledge
from slave
acknowledge
from master
S
DATA
R/W
first byte
at this moment master-transmitter
becomes master-receiver and
slave-receiver becomes
slave-transmitter
last byte
su01424
no acknowledge
from master
1
slave address
data from register
slave address
Figure 9. READ from register
01
0
A2
A1
A0
READ FROM
PORT
DATA INTO
PORT
SDA
S1
A
DATA 1
DATA 4
slave address
data from port
start condition
R/W
acknowledge
from slave
acknowledge
from master
stop
condition
tps
DATA 4
DATA 2
P
DATA 3
tph
su01465
no acknowledge
from master
NA
INT
tir
tiv
12
SCL
34
5
6
7
8
9
NOTES:
1. This figure assumes the command byte has previously been programmed with 00h.
2. Transfer of data can be stopped at any moment by a stop condition.
Figure 10. READ input port register
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