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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： | 12/15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
6
Device address
01
0
A2
A1
A0
SLAVE ADDRESS
su01669
FIXED
HARDWARE SELECTABLE
R/W
Figure 5. PCA9554 address
01
1
A2
A1
A0
slave address
su01418
fixed
programmable
R/W
Figure 6. PCA9554A address
Bus transactions
Data is transmitted to the PCA9554/PCA9554A registers using the write mode as shown in Figures 7 and 8. Data is read from the
PCA9554/PCA9554A registers using the read mode as shown in Figures 9 and 10. These devices do not implement an auto-increment function
so once a command byte has been sent, the register which was addressed will continue to be accessed by reads until a new command byte
has been sent.
12
SCL
WRITE TO
PORT
DATA OUT
FROM PORT
3
4
567
8
SDA
S0
A
0
1
0
A2
A1
A0
DATA 1
slave address
data to port
start condition
R/W
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
tpv
DATA 1 VALID
su01421
9
1
00
0
00
0
command byte
P
Figure 7. WRITE to output port register
12
SCL
3
4
567
8
SDA
S0
A
0
1
0
A2
A1
A0
DATA
slave address
data to register
start condition
R/W
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
su01422
9
00
0
00
1
command byte
1/0
DATA TO
REGISTER
P
Figure 8. WRITE to configuration or polarity inversion registers
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