PCAL6408AHKX NXP Semiconductors, PCAL6408AHKX Datasheet - Page 15

• 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
8. Bus transactions
PCAL6408A
Product data sheet
Fig 8.
Fig 9.
SDA
write to port
data out from port
Write to Output port register
Write to Configuration or Polarity inversion registers
SDA
SCL
SCL
S
START condition
S
START condition
1
0
8.1 Write commands
1
0
2
1
2
slave address
1
3
0
slave address
The PCAL6408A is an I
PCAL6408A through write and read commands using I
lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be
connected to a positive supply via a pull-up resistor when connected to the output stages
of a device. Data transfer may be initiated only when the bus is not busy.
Data is transmitted to the PCAL6408A by sending the device address and setting the
Least Significant Bit (LSB) to a logic 0 (see
byte is sent after the address and determines which register receives the data that follows
the command byte. There is no limitation on the number of data bytes sent in one write
transmission.
3
0
4
0
4
0
5
0
5
0
6
0
6
0
7
AD
DR
R/W
7
AD
DR
8
R/W
0
8
0
All information provided in this document is subject to legal disclaimers.
9
A
acknowledge
from slave
9
A
acknowledge
from slave
0
0
Rev. 2 — 6 December 2012
0
1/0 0
2
C-bus slave device. Data is exchanged between the master and
command byte
0
command byte
Low-voltage translating, 8-bit I
0
0
0
0 1/0 1/0 1/0
0
0
1
A
acknowledge
from slave
Figure 5
A
acknowledge
from slave
data to port
data to register
for device address). The command
DATA 1
DATA 1
2
C-bus. The two communication
2
C-bus/SMBus I/O expander
t
v(Q)
PCAL6408A
A
acknowledge
from slave
A
acknowledge
from slave
© NXP B.V. 2012. All rights reserved.
DATA 1 VALID
STOP
condition
P
STOP
condition
P
002aah090
002aaf825
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