PCA9557D/DG,118 NXP Semiconductors, PCA9557D/DG,118 Datasheet - Page 7

• Manufacturer Part Number: PCA9557D/DG,118
• Description: IC I/O PORT I2C/SMBUS 16-SOIC
• Manufacturer: NXP Semiconductors

Specifications of PCA9557D/DG,118

• 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
• Package / Case: 16-SOIC (3.9mm Width)
• Includes: POR
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935285892118

NXP Semiconductors
7. Functional description
PCA9557
Product data sheet
7.1 Device address
7.2 Control register
Refer to
Following a START condition the bus master must output the address of the slave it is
accessing. The address of the PCA9557 is shown in
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
The last bit of the slave address defines the operation to be performed. When set to
logic 1 a read is selected, while a logic 0 selects a write operation.
Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9557, which will be stored in the control register. This register can be
written and read via the I
Table 4.
D1
0
0
1
1
Fig 8.
Fig 9.
Figure 1 “Block diagram of
PCA9557 device address
Control register
D0
0
1
0
1
Register definition
Name
Register 0
Register 1
Register 2
Register 3
Rev. 06 — 11 June 2008
2
C-bus.
bit:
0
7
0
0
fixed
PCA9557”.
6
0
Access
read-only
read/write
read/write
read/write
slave address
1
5
0
1
8-bit I
4
0
programmable
A2
3
0
2
A1
C-bus and SMBus I/O port with reset
2
0
Figure
A0 R/W
002aad279
Description
Input port register
Output port register
Polarity inversion register
Configuration register
D1
002aad280
1
D0
0
8. To conserve power, no
PCA9557
© NXP B.V. 2008. All rights reserved.
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