參數(shù)資料
型號(hào)： MAX1608
廠商： Maxim Integrated Products, Inc.
英文描述： 16-Bit Bus Transceivers And Registers With 3-State Outputs 56-TSSOP -40 to 85
中文描述： 八通道、SMBus至并行輸入/輸出擴(kuò)展器
文件頁(yè)數(shù)： 9/16頁(yè)
文件大?。?/td> 291K
代理商： MAX1608
data MSB first; therefore, IO7, MASK7, and data 7 bit
correspond to the MSB (first bit of the data byte).
Other Registers
RAP uses the send-byte protocol to resample the
address pins. Do not use read- and write-byte proto-
cols to RAP because data is redirected to NDR1
although the ADD_ pins will be sampled.
SPOR uses the send-byte protocol to resample the
address pins and reset the registers to the POR state.
Do not use read- and write-byte protocols to SPOR
because data is redirected to NDR1 although the func-
tion will be performed.
MFID uses the read-byte protocol to access the ID reg-
ister. Do not use write-byte protocol to MFID because
data is redirected to NDR1.
SMBSUS
(Suspend-Mode) Input
The state of the
SMBSUS
input selects which register
contents (NDR1 or SDR1) are applied to the IO_ pins
and which set of registers are used to mask the inter-
rupts (NDR2, NDR3 or NDR2, SDR3). Driving
SMBSUS
low selects the suspend-mode registers, while driving
SMBSUS
high selects the normal registers. This feature
allows the system to select between two different I/O
M
Octal SMBus-to-Parallel I/O Expanders
_______________________________________________________________________________________
9
SMBCLK
A
B
C
D
E
F
G
H
I
J
K
SMBDATA
t
SU:STA
t
HD:STA
t
LOW
t
HIGH
t
SU:DAT
t
HD:DAT
t
HD:DAT
t
SU:STO
t
BUF
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
L
M
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
I = SLAVE PULLS SMBDATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO MASTER
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION, DATA EXECUTED BY SLAVE
M = NEW START CONDITION
Figure 3. SMBus Write Timing
SMBCLK
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
A
B
C
D
E
F
G
H
I
J
SMBDATA
t
SU:STA
t
HD:STA
t
LOW
t
HIGH
t
SU:DAT
t
HD:DAT
t
SU:DAT
t
SU:STO
t
BUF
K
E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = ACKNOWLEDGE CLOCK PULSE
J = STOP CONDITION
K = NEW START CONDITION
Figure 4. SMBus Read Timing
相關(guān)PDF資料
PDF描述
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