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參數資料
型號: MAX5952CUAX+
廠商: Maxim Integrated
文件頁數: 24/50頁
文件大小: 1006K
描述: IC PSE CNTRLR FOR POE 36-SSOP
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 30
類型: 以太網供電控制器(PoE)
應用: 遠程外設(工業控制,相機,數據訪問)
內部開關:
工作溫度: 0°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 36-BSOP(0.295",7.50mm 寬)
供應商設備封裝: 36-SSOP
包裝: 管件
High-Power, Quad, PSE Controller
for Power-Over-Ethernet
24   ______________________________________________________________________________________
Figure 9. Slave Address
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 MAX5952
ACKNOWLEDGE FROM MAX5952
D15   D14   D13   D12   D11   D10   D9    D8
CONTROL BYTE IS STORED ON RECEIPT OF STOP CONDITION
R/W
Slave Address
The MAX5952 has 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 three bits (MSBs) of the
MAX5952 slave address. Slave address bits A3, A2,
A1, and A0 represent the states of the MAX5952s A3,
A2, A1, and A0 inputs, allowing up to sixteen MAX5952
devices to share the bus. The states of the A3, A2, A1
and A0 latch in upon the reset of the MAX5952 into reg-
ister R11h. The MAX5952 monitors the bus continuous-
ly, waiting for a START condition followed by the
MAX5952s slave address. When a MAX5952 recog-
nizes its slave address, the MAX5952 acknowledges
and is 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 MAX5952 puts out on the data line
its own address whenever its interrupt is active. So
does every other device connected to the SDAOUT line
that has an active interrupt. After every bit transmitted,
the MAX5952 checks that the data line effectively cor-
responds 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 com-
plete the transmission. The microcontroller can then
respond to the interrupt and take proper actions. The
MAX5952 does not reset its 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 MAX5952
A write to the MAX5952 comprises of the MAX5952s
slave address transmission with the R/W bit set to 0, fol-
lowed by at least one byte of information. The first byte
of information is the command byte (Figure 10). The
command byte determines which register of the
MAX5952 is written to by the next byte, if received. If
the MAX5952 detects a STOP condition after receiving
the command byte, the MAX5952 takes no further
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
MAX5952 selected by the command byte. If the
MAX5952 transmits multiple data bytes before the
MAX5952 detects a STOP condition, these bytes store
in subsequent MAX5952 internal registers because the
control byte address auto-increments.
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參數描述
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