PCA9557D,112 NXP Semiconductors, PCA9557D,112 Datasheet - Page 13

• Manufacturer Part Number: PCA9557D,112
• Description: IC I/O EXPANDER I2C 8B 16SOIC
• Manufacturer: NXP Semiconductors

Specifications of PCA9557D,112

• Package / Case: 16-SOIC (3.9mm Width)
• Interface: I²C, SMBus
• Number Of I /o: 8
• Interrupt Output: No
• Frequency - Clock: 400kHz
• Voltage - Supply: 2.3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Includes: POR
• Logic Family: PCA9557
• Number Of Lines (input / Output): 8.0 / 8.0
• Operating Supply Voltage: 2.3 V to 5.5 V
• Power Dissipation: 200 mW
• Operating Temperature Range: - 40 C to + 85 C
• Input Voltage: 5 V
• Logic Type: I2C, SMBus
• Maximum Clock Frequency: 400 KHz
• Mounting Style: SMD/SMT
• Number Of Input Lines: 8.0
• Number Of Output Lines: 8.0
• Output Current: 50 mA
• Output Voltage: 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-1060-5; 935270674112; PCA9557D

NXP Semiconductors
9. Application design-in information
PCA9557
Product data sheet
Fig 18. Typical application
V
DD
(5 V)
Device address configured as 0011 100x for this example.
IO0, IO2, IO3 configured as outputs.
IO1, IO4, IO5 configured as inputs.
IO6, IO7 are not used.
CONTROLLER
MASTER
V
V
DD
SS
RESET
9.1 Minimizing I
SDA
SCL
When the I/Os are used to control LEDs, they are normally connected to V
resistor as shown in
I/O V
lower than V
Designs needing to minimize current consumption, such as battery power applications,
should consider maintaining the I/O pins greater than or equal to V
Figure 19
than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O V
at or above V
1.8 k
I
is about 1.2 V less than V
1.8 k
shows a high value resistor in parallel with the LED.
DD
DD
.
DD
2 k
and prevents additional supply current consumption when the LED is off.
when the I/Os are used to control LEDs
Figure
2 k
Rev. 06 — 11 June 2008
SCL
SDA
RESET
A2
A1
A0
18. Since the LED acts as a diode, when the LED is off the
PCA9557
V
V
SS
DD
DD
. The supply current, I
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
620
8-bit I
2
C-bus and SMBus I/O port with reset
DD
100 k
( 5)
, increases as V
enable
Figure 20
DD
INT
RESET
ALARM
(e.g., alarm system)
(e.g., temp. sensor)
A
B
when the LED is off.
SUBSYSTEM 1
SUBSYSTEM 2
SUBSYSTEM 3
PCA9557
(e.g., counter)
© NXP B.V. 2008. All rights reserved.
shows V
controlled switch
(e.g., CBT device)
DD
I
002aad285
becomes
through a
V
DD
DD
13 of 26
less
I