High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
26   ______________________________________________________________________________________
Figure 9. Slave Address
SDAIN/SDA
SCL
1
0
A3
A2
A1
A0
0
MSB
LSB
ACK
R/W
Figure 10. Control Byte Received
S
A
A
P
0
SLAVE ADDRESS
CONTROL BYTE
ACKNOWLEDGE FROM THE MAX5965A/MAX5965B
ACKNOWLEDGE FROM THE MAX5965A/MAX5965B
D15   D14   D13   D12   D11   D10   D9    D8
CONTROL BYTE IS STORED ON RECEIPT OF STOP CONDITION
R/W
Slave Address
The MAX5965A/MAX5965B have a 7-bit long slave
address (Figure 9). The bit following the 7-bit slave
address (bit eight) is the R/W bit, which is low for a
write command and high for a read command.
010 always represents the first 3 bits (MSBs) of the
MAX5965A/MAX5965B slave address. Slave address
bits A3, A2, A1, and A0 represent the states of the
MAX5965A/MAX5965Bs A3, A2, A1, and A0 inputs,
allowing up to sixteen MAX5965A/MAX5965B devices
to share the bus. The states of the A3, A2, A1, and A0
latch in upon the reset of the MAX5965A/MAX5965B
into register R11h. The MAX5965A/MAX5965B monitor
the bus continuously, waiting for a START condition fol-
lowed by the MAX5965A/MAX5965Bs slave address.
When a MAX5965A/MAX5965B recognizes its slave
address, the MAX5965A/MAX5965B acknowledge and
are then ready for continued communication.
Global Addressing and Alert Response Protocol
The global address call is used in writing mode to write
the same register to multiple devices (address 0x60). In
read mode (address 0x61), the global address call is
used as the alert response address. When responding
to a global call, the MAX5965A/MAX5965B put their
own address out on the data line whenever the interrupt
is active. Every other device connected to the SDAOUT
line that has an active interrupt also does this. After
every bit transmitted, the MAX5965A/MAX5965B check
that the data line effectively corresponds to the data it
is delivering. If it is not, it then backs off and frees the
data line. This litigation protocol always allows the part
with the lowest address to complete the transmission.
The microcontroller can then respond to the interrupt
and take proper actions. The MAX5965A/MAX5965B do
not reset their own interrupt at the end of the alert
response protocol. The microcontroller has to do it by
clearing the event register through their CoR adresses
or activating the CLR_INT pushbutton.
Message Format for Writing to the
MAX5965A/MAX5965B
A write to the MAX5965A/MAX5965B comprises of the
MAX5965A/MAX5965Bs slave address transmission
with the R/W bit set to 0, followed by at least 1 byte of
information. The first byte of information is the com-
mand byte (Figure 10). The command byte determines
which register of the MAX5965A/MAX5965B is written to
by the next byte, if received. If the MAX5965A/
MAX5965B detect a STOP condition after receiving the
command byte, the MAX5965A/MAX5965B take no fur-
ther action beyond storing the command byte. Any
bytes received after the command byte are data bytes.
The first data byte goes into the internal register of the
MAX5965A/MAX5965B selected by the command byte.
If the MAX5965A/MAX5965B transmit multiple data
bytes before the MAX5965A/MAX5965B detect a STOP
condition, these bytes store in subsequent MAX5965A/
MAX5965B internal registers because the control byte
address autoincrements.
相关PDF资料
MAX5969DETE+T IC CTRLR INTERFCE W/MOSFT 16TQFN
MAX5971AETI+ IC CTRLR PD IEEE 802.3AF 28WQFN
MAX5972AETE+T IC CONTROLLER INTERFACE 16TQFN
MAX5978ETJ+ IC CTLR HOT-SWAP 32TQFN
MAX5981BETE+ IC CTRLR PD IEEE 802.3AF 16TQFN
MAX5986AETE+ IC POE SWITCH PSE 16TQFN
MAX6509CAZK/V+T IC TEMP SWITCH RES-PROG 5TSOT
MAX6513TT075+T IC TEMP SWITCH REMOTE 6-TDFN
相关代理商/技术参数
MAX5965AEAX+T 功能描述:热插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MAX5965AUAX+ 功能描述:热插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MAX5965AUAX+T 功能描述:热插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MAX5965BCAX+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
MAX5965BCAX+T 制造商:Maxim Integrated Products 功能描述:HIGH-POWER, QUAD, MONOLITHIC, PSE CONTROLLERS FOR POWER OVER - Tape and Reel
MAX5965BEAX+ 功能描述:热插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MAX5965BEAX+T 功能描述:热插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MAX5965BUAX+ 功能描述:热插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube