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參數(shù)資料
| 型號： | 9534 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit I2C and SMBus, low power I/O port with interrupt |
| 中文描述： | 8位I2C和SMBus，低功率的I / O端口中斷 |
| 文件頁數(shù)： | 5/17頁 |
| 文件大小： | 146K |
| 代理商： | 9534 |
Philips Semiconductors
Product data sheet
PCA9534
8-bit I
2
C and SMBus low power I/O port with interrupt
2004 Sep 30
5
SIMPLIFIED SCHEMATIC OF I/O0 TO I/O7
WRITE PULSE
DATA FROM
SHIFT REGISTER
WRITE
CONFIGURATION
PULSE
D
C
K
FF
Q
D
C
K
Q
FF
D
C
K
Q
FF
D
C
K
Q
FF
INPUT PORT
REGISTER
POLARITY
INVERSION
REGISTER
OUTPUT
PORT
REGISTER
DATA FROM
SHIFT REGISTER
DATA FROM
SHIFT REGISTER
WRITE
POLARITY
PULSE
CONFIGURATION
REGISTER
OUTPUT PORT
REGISTER DATA
INPUT PORT
REGISTER DATA
POLARITY
REGISTER DATA
READ PULSE
SU01784
Q
Q
Q
Q
TO INT
Q1
Q2
V
DD
ESD PROTECTION DIODE
ESD PROTECTION DIODE
I/O0 TO I/O7
V
SS
NOTE:
At Power-on Reset, all registers return to default values.
Figure 4. Simplified schematic of I/O0 to I/O7
I/O port
When an I/O is configured as an input, FETs Q1 and Q2 are off,
creating a high impedance input. The input voltage may be raised
above V
DD
to a maximum of 5.5 V.
If the I/O is configured as an output, then either Q1 or Q2 is enabled,
depending on the state of the output port register. Care should be
exercised if an external voltage is applied to an I/O configured as an
output because of the low impedance paths that exist between the
pin and either V
DD
or V
SS
.
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