PCAL6408AHKX NXP Semiconductors, PCAL6408AHKX Datasheet - Page 18

• Manufacturer Part Number: PCAL6408AHKX
• Description: Interface - I/O Expanders 8bit I2C/SMBus IO Expander w/Interrupt
• Manufacturer: NXP Semiconductors

Specifications of PCAL6408AHKX

• Maximum Operating Frequency: 100 kHz
• Operating Supply Voltage: 1.65 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: XQFN-16
• Operating Current: 200 mA
• Output Current: 25 mA
• Product Type: I/O Expanders

NXP Semiconductors
9. Application design-in information
PCAL6408A
Product data sheet
Fig 13. Typical application
(1) Resistors are required for inputs (on P port) that may float. If a driver to an input will never let the input float, a resistor is not
Device address configured as 0100 000x for this example.
P0 and P2 through P4 are configured as inputs.
P1 and P5 through P7 are configured as outputs.
needed. Outputs (in the P port) do not need pull-up resistors.
V
DD(I2C-bus)
9.1 Minimizing I
= 1.8 V
CONTROLLER
When the I/Os are used to control LEDs, normally they are connected to V
resistor as shown in
V
shows how I
current consumption, such as battery power applications, should consider maintaining the
I/O pins greater than or equal to V
Figure 14
than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O V
at or above V
MASTER
I
is about 1.2 V less than V
V
V
DD
SS
RESET
SDA
SCL
INT
10 kΩ
shows a high-value resistor in parallel with the LED.
DD
DD
10 kΩ
DD
increases as V
All information provided in this document is subject to legal disclaimers.
and prevent additional supply current consumption when the LED is off.
when I/Os control LEDs
10 kΩ
Figure
Rev. 2 — 6 December 2012
10 kΩ
Low-voltage translating, 8-bit I
13. The LED acts as a diode, so when the LED is off, the I/O
DD
I
. The I
becomes lower than V
V
V
SCL
SDA
INT
RESET
ADDR
DD(I2C-bus)
DD(I2C-bus)
DD
PCAL6408A
when the LED is off.
DD
V
SS
parameter in
V
V
DD(P)
DD(P)
P0
P1
P2
P3
P4
P5
P6
P7
DD
Table 23 “Static characteristics”
. Designs that must minimize
10 kΩ (× 3)
2
enable
C-bus/SMBus I/O expander
ALARM
(e.g., alarm system)
Figure 15
KEYPAD
PCAL6408A
SUBSYSTEM 1
A
B
(1)
© NXP B.V. 2012. All rights reserved.
002aah092
controlled
switch
shows V
DD
through a
DD
18 of 48
less
I