PCA9535CD,118 NXP Semiconductors, PCA9535CD,118 Datasheet - Page 9

• Manufacturer Part Number: PCA9535CD,118
• Description: IC I/O EXPANDER I2C 16B 24SOIC
• Manufacturer: NXP Semiconductors

Specifications of PCA9535CD,118

• Package / Case: 24-SOIC (7.5mm Width)
• Interface: I²C, SMBus
• Number Of I /o: 16
• Interrupt Output: Yes
• Frequency - Clock: 400kHz
• Voltage - Supply: 2.3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Includes: POR
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 935285271118; PCA9535CD-T; PCA9535CD-T

NXP Semiconductors
PCA9535_PCA9535C_5
Product data sheet
6.5.1 Writing to the port registers
6.5 Bus transactions
Data is transmitted to the PCA9535/PCA9535C by sending the device address and
setting the least significant bit to a logic 0 (see
address”). The command byte is sent after the address and determines which register will
receive the data following the command byte.
The eight registers within the PCA9535/PCA9535C are configured to operate as four
register pairs. The four pairs are Input Ports, Output Ports, Polarity Inversion Ports, and
Configuration Ports. After sending data to one register, the next data byte will be sent to
the other register in the pair (see
sent to Output Port 1 (register 3), then the next byte will be stored in Output Port 0
(register 2). There is no limitation on the number of data bytes sent in one write
transmission. In this way, each 8-bit register may be updated independently of the other
registers.
Fig 7.
configuration
write polarity
shift register
shift register
shift register
write pulse
read pulse
data from
data from
data from
(1) PCA9535C I/Os are open-drain only. The portion of the PCA9535 schematic marked inside the
pulse
pulse
write
At power-on reset, all registers return to default values.
dotted line box is not in PCA9535C.
Simplified schematic of I/Os
configuration
register
D
CK
FF
Rev. 05 — 15 September 2008
Q
Q
16-bit I
output port
register
D
CK
2
Figure 8
FF
C-bus and SMBus, low power I/O port with interrupt
Q
and
PCA9535; PCA9535C
input port
register
polarity inversion
register
D
CK
D
CK
Figure
Figure 6 “PCA9535; PCA9535C device
FF
FF
Q
Q
9). For example, if the first byte is
(1)
Q1
Q2
© NXP B.V. 2008. All rights reserved.
output port
register data
V
I/O pin
V
input port
register data
to INT
polarity
inversion
register data
DD
SS
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