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PDF PCA9555DB Data sheet ( Hoja de datos )
| Número de pieza | PCA9555DB | |
| Descripción | 16-bit I2C and SMBus I/O port with interrupt | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
PCA9555
16-bit I2C and SMBus I/O port with interrupt
Product data sheet
Supersedes data of 2004 Jul 27
2004 Sep 30
Philips
Semiconductors
1 page  
Philips Semiconductors
16-bit I2C and SMBus I/O port with interrupt
Product data sheet
PCA9555
SIMPLIFIED SCHEMATIC OF I/Os
DATA FROM
SHIFT REGISTER
DATA FROM
SHIFT REGISTER
WRITE CONFIGURATION
PULSE
WRITE PULSE
CONFIGURATION
REGISTER
DQ
FF
CK Q
READ PULSE
DQ
FF
CK Q
OUTPUT
PORT
REGISTER
Q1
INPUT PORT
REGISTER
DQ
FF
CK Q
100 kΩ
Q2
DATA FROM
SHIFT REGISTER
WRITE
POLARITY
PULSE
DQ
FF
CK Q
POLARITY
INVERSION
REGISTER
NOTE: At Power-on Reset, all registers return to default values.
Figure 4. Simplified schematic of I/Os
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 to VDD. The
input voltage may be raised above VDD to a maximum of 5.5 V.
If the I/O is configured as an output, then either Q1 or Q2 is on,
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 path that exists between the
pin and either VDD or VSS.
OUTPUT PORT
REGISTER DATA
VDD
I/O PIN
VSS
INPUT PORT
REGISTER DATA
TO INT
POLARITY
REGISTER DATA
SU01473
2004 Sep 30
5
5 Page 
Philips Semiconductors
16-bit I2C and SMBus I/O port with interrupt
Product data sheet
PCA9555
TYPICAL APPLICATION
VDD
VDD 10 kΩ 10 kΩ 10 kΩ
MASTER
CONTROLLER
SCL
SDA
INT
GND
VDD
SCL
SDA
INT
2 kΩ
I/O0.0
I/O0.1
I/O0.2
I/O0.3
I/O0.4
I/O0.5
PCA9555
I/O0.6
I/O0.7
I/O1.0
I/O1.1
A1 I/O1.2
I/O1.3
A0 I/O1.4
I/O1.5
I/O1.6
VSS I/O1.7
SUBSYSTEM 1
(e.g. temp
sensor)
INT
SUBSYSTEM 2
(e.g. counter)
RESET
A
ALARM
SUBSYSTEM 3
(e.g. alarm system)
ENABLE
B
Controlled Switch
(e.g. CBT device)
VDD
10 DIGIT
NUMERIC
KEYPAD
NOTE: Device address configured as 1110100 for this example
I/O0.0, I/O0.2, I/O0.3, configured as outputs
I/O0.1, I/O0.4, I/O0.5, configured as inputs
I/O0.6, I/O0.7, and I/O1.0 to I/O1.7 configured as inputs
Figure 11. Typical application.
SW02284
2004 Sep 30
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet PCA9555DB.PDF ] | |
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