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參數(shù)資料
| 型號： | PCA9558 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit I2C and SMBus I/O port with 5-bit multiplexed/1-bit latched 6-bit I2C EEPROM and 2 k bit EEPROM |
| 中文描述： | 8位I2C和SMBus I / O與5位multiplexed/1-bit端口鎖存6位I2C EEPROM及2度位EEPROM |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 131K |
| 代理商： | PCA9558 |
Philips Semiconductors
8-bit I
2
C and SMBus I/O port with 5-bit multiplexed/1-bit
latched 6-bit I
2
C EEPROM and 2 k bit EEPROM
Product data
PCA9558
2002 May 24
11
SW00645
S
1
0
0
1
1
1 A0
0
A
A
SLAVE ADDRESS
R/W
ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM SLAVE
COMMAND BYTE
EEPROM ADDRESS
ACKNOWLEDGE
FROM SLAVE
A
a7 a6 a5 a4 a3 a2 a1 a0
P
x
x
x
x
x
x
x
x
A
DUMMY BYTE
ACKNOWLEDGE
FROM SLAVE
GPIO INPUT PORT DATA LATCHED
0
0
0
1
0
0
1
0
PROGRAMMING BEGINS AFTER STOP
SEE FIGURE 2 FOR THE NEEDED COMMAND CODE.
Figure 15. Read from GPIO Input Port Register and write to 256 byte EEPROM
RESET
Power-on Reset
When power is applied to V
DD
, an internal power-on reset holds the
PCA9558 in a reset state until V
DD
has reached V
POR
. At that point,
the reset condition is released and the PCA9558 registers and
SMBus state machine will initialize to their default states.
External Reset
A reset of the GPIO registers can be accomplished by holding the
I/O_OUT_LOW pin low for a minimum of Tw. These GPIO registers
return to their default states until the I/O_OUT_LOW input is once
again high.
USING THE PCA9558 ON THE SMBus
It is possible to use Intel
chipsets to communicate with the
PCA9558. There are no limitations when the SMBus Controller is
communicating with the Mux or the GPIO; however, there are
limitations with the 2K serial EEPROM. Because of being able to
address any location in the EEPROM block using the 2nd command
byte, the designer using the PCA9558 on the SMBus will have to
program around it, an easy thing to do. The device designers had to
deal with the specifics of addressing the EEPROM and chose the
I
2
C spec and use the 2nd command byte to address any location in
the EEPROM block.
In order to write to the EEPROM, write the EEPROM address byte
in the Data0 byte and the data to be sent should be placed in the
Data1 byte. The Intel
chipset’s Word Data instruction would then
send the address, followed by the command register then Data0
(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 spec:
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
.
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9558PW | 功能描述:接口-I/O擴展器 5BIT MP/1-BITL 6BIT I2C EEPROM RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| PCA9558PW,112 | 功能描述:接口-I/O擴展器 5BIT MP/1-BITL 6BIT RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| PCA9558PW,118 | 功能描述:接口-I/O擴展器 5BIT MP/1-BITL 6BIT RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| PCA9558PW-T | 功能描述:接口-I/O擴展器 5BIT MP/1-BITL 6BIT I2C EEPROM RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| PCA9559 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:5-bit multiplexed/1-bit latched 6-bit I2C EEPROM |
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