參數(shù)資料
型號(hào)： TC654EUN
廠商： Microchip Technology Inc.
英文描述： Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
中文描述： 雙PWM風(fēng)扇的SMBus⑩故障檢測(cè)與風(fēng)扇轉(zhuǎn)速控制器
文件頁(yè)數(shù)： 16/36頁(yè)
文件大?。?/td> 706K
代理商： TC654EUN
TC654/TC655
DS21734A-page 16
2002 Microchip Technology Inc.
The data on the line must be changed during the LOW
period of the clock signal. There is one clock pulse per
bit of data. Each data transfer is initiated with a START
condition and terminated with a STOP condition. The
number of the data bytes transferred between the
START and STOP conditions is determined by the
master device and is unlimited.
5.1.7
ACKNOWLEDGE (ACK)
Each receiving device, when addressed, is obliged to
generate an acknowledge bit after the reception of
each byte. The master device must generate an extra
clock pulse, which is associated with this acknowledge
bit.
The device that acknowledges has to pull down the
SDA line during the acknowledge clock pulse in such a
way that the SDA line is stable LOW during the HIGH
period of the acknowledge related clock pulse. Setup
and hold times must be taken into account. During
reads, a master device must signal an end of data to
the slave by not generating an acknowledge bit on the
last byte that has been clocked out of the slave. In this
case, the slave (TC654/TC655) will leave the data line
HIGH to enable the master device to generate the
STOP condition.
5.2
SMBus Protocols
The TC654/TC655 devices communicate with three
standard SMBus protocols. These are the write byte,
read byte and receive byte. The receive byte is a short-
ened method for reading from, or writing to, a register
which had been selected by the previous read or write
command. These transmission protocols are shown in
Figures 5-1, 5-2 and 5-3.
FIGURE 5-1:
SMBus Protocol: Write Byte Format.
FIGURE 5-2:
SMBus Protocol: Read Byte Format.
FIGURE 5-3:
SMBus Protocol: Receive Byte Format.
S
ADDRESS
7 Bits
Slave Address
WR
ACK
COMMAND
8 Bits
Command Byte: selects
which register you are
writing to.
ACK
DATA
8 Bits
Data Byte: data goes
into the register set
by the command byte.
ACK
P
S
ADDRESS
7 Bits
Slave Address
WR
ACK
COMMAND
8 Bits
Command Byte: selects
which register you are
writing to.
ACK
S
ADDRESS
7 Bits
Slave Address:
repeated due to change
in data flow direction.
RD
ACK
DATA
8 Bits
NACK
P
Data Byte: reads from
the register set by the
command byte.
S
ADDRESS
7 Bits
Slave Address
RD
ACK
DATA
8 Bits
NACK
P
Data Byte: reads data from
the register commanded by
the last Read Byte or Write
Byte transmission
S = Start Condition
P = Stop Condition
Shaded = Slave Transmission
ACK = Acknowledge = 0
NACK = Not Acknowledged = 1
WR = Write = 0
RD = Read = 1
相關(guān)PDF資料
PDF描述
TC655EUN Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
TC654 Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
TC655 Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
TC665EUN SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
TC664EUN SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC654EUNTR 功能描述:軟開關(guān) PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
TC655 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
TC655EUN 功能描述:軟開關(guān) PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
TC655EUNTR 功能描述:軟開關(guān) PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
TC65A 制造商:CDE 制造商全稱:Cornell Dubilier Electronics 功能描述:Axial Leaded Aluminum Electrolytic Capacitors
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