PCA9558PW,112 NXP Semiconductors, PCA9558PW,112 Datasheet - Page 15

• Manufacturer Part Number: PCA9558PW,112
• Description: IC I2C/SMBUS 8BIT 28-TSSOP
• Manufacturer: NXP Semiconductors

Specifications of PCA9558PW,112

• Applications: PC's, PDA's
• Interface: I²C
• Voltage - Supply: 3 V ~ 3.6 V
• Package / Case: 28-TSSOP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-3399-5; 935269433112; PCA9558PW

NXP Semiconductors
8. Application design-in information
PCA9558_4
Product data sheet
Fig 18. Typical application
CPU
OR
C
I
2
C-bus
I
2
C-bus multiplexer
PCA9544A
4-channel
(EEPROM address), and then the Data1 (data byte). A read from the EEPROM would be
a two-step process. The first step would be to do a ‘Write Byte’ with the EEPROM address
in the Data0 register. The second step would be to do a ‘Receive Byte’ where the data is
stored in the command register.
Other differences from the SMBus specification :
A central processor/controller typically located on the system main board can use the
400 kHz I
status or version control type of information. The PCA9558 may be programmed at
manufacturing to store information regarding board build, firmware version, manufacturer
identification, configuration option data, etc. Alternately, these devices can be used as
convenient interface for board configuration, thereby utilizing the I
intra-system communication bus.
NXP
•
•
Paragraph 5.5.5 – Read Byte/Word in figure 5-11: The PCA9558 follows this same
command code with one exception, the PCA9558 requires 2 bytes of command
before the repeated START.
Paragraph 5.5.6 – Process call in figure 5-15: The PCA9558 read operation is very
similar to the SMBus process call. In the PCA9558 read operation you send a START
condition – slave address with a write bit – 2 bytes of command code –
repeated START – slave address with a read bit – then read data.
2
C-bus/SMBus to poll the PCA9558 devices located on the system cards for
BACKPLANE
Rev. 04 — 14 April 2009
I
I
I
I
2
2
2
2
C-bus
C-bus
C-bus
C-bus
card ID, subroutines, configuration data, or revision history
CONTROL
EEPROM
MUXED EEPROM
ASIC
8-bit I
GPIO
configuration settings
DIP switch or jumper replacement
2
2
C-bus/SMBus I/O port
C-bus/SMBus as an
monitoring
control
and
PCA9558
© NXP B.V. 2009. All rights reserved.
PCA9558
INPUTS
ALARM
LEDs
002aad392
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