PCA9538ABSHP NXP Semiconductors, PCA9538ABSHP Datasheet - Page 9

• Manufacturer Part Number: PCA9538ABSHP
• Description: Interface - I/O Expanders 8bit I2C IO Port
• Manufacturer: NXP Semiconductors

Specifications of PCA9538ABSHP

• 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: HVQFN-16
• Operating Current: 160 mA
• Output Current: 25 mA
• Power Dissipation: 200 mW
• Product Type: I/O Expanders

NXP Semiconductors
7. Bus transactions
PCA9538A
Product data sheet
Fig 7.
Fig 8.
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
1
7.1 Write commands
1
1
2
1
2
slave address
1
3
1
slave address
The PCA9538A is an I
PCA9538A 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 PCA9538A by sending the device address and setting the Least
Significant Bit (LSB) to a logic 0 (see
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
1
4
0
4
0
5
0 A1 A0
5
0 A1 A0
6
6
7
R/W
7
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. 1 — 28 September 2012
0
2
1/0 1/0 0 1/0 1/0 1/0 1/0
C-bus slave device. Data is exchanged between the master and
command byte
0
command byte
Low-voltage 8-bit I
0
0
0
0
Figure 4
1
A
acknowledge
from slave
A
acknowledge
from slave
for device address). The command byte is
2
C-bus I/O port with interrupt and reset
data to port
data to register
DATA 1
2
C-bus. The two communication
DATA 1
t
v(Q)
PCA9538A
A
acknowledge
from slave
A
acknowledge
from slave
© NXP B.V. 2012. All rights reserved.
DATA 1 VALID
STOP
condition
P
STOP
condition
P
002aah103
002aah102
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