參數(shù)資料
型號(hào)： PCA9554A
廠商： NXP Semiconductors N.V.
英文描述： 8-bit I2C and SMBus I/O port with interrupt
中文描述： 8位I2C和SMBus I / O端口的中斷
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 183K
代理商： PCA9554A
Philips Semiconductors
Product data sheet
PCA9554/PCA9554A
8-bit I
2
C and SMBus I/O port with interrupt
2004 Sep 30
6
SIMPLIFIED SCHEMATIC OF I/O0 TO I/O7
WRITE PULSE
DATA FROM
SHIFT REGISTER
V
DD
I/O0 TO I/O7
V
SS
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
SU01472
Q
Q
Q
Q
TO INT
100 k
Q1
Q2
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 with a weak pull-up (100 k
typ.) to
V
DD
. 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
.
相關(guān)PDF資料
PDF描述
PCA9554AN 8-bit I2C and SMBus I/O port with interrupt
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCA9554ABS 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit I2C and SMBus I/O port with interrupt
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PCA9554ABS118 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述:
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