參數(shù)資料
型號(hào)： MAX7319
廠商： Maxim Integrated Products, Inc.
英文描述： 4-Bit D-type Registers with 3-State Outputs 16-CFP -55 to 125
中文描述： I²C端口擴(kuò)展器，具有8路輸入，可屏蔽瞬態(tài)檢測(cè)
文件頁(yè)數(shù)： 11/16頁(yè)
文件大?。?/td> 251K
代理商： MAX7319
M
I
2
C Port Expander with Eight Inputs and
Maskable Transition Detection
______________________________________________________________________________________
11
SCL
MAX7319 SLAVE ADDRESS
S
1
1
0
A
P
1
PORTS
INT OUTPUT
R/W
PORT SNAPSHOT
t
IV
t
PH
t
IR
A
D0
D1
D2
D3
D4
D5
D6
D7
PORT SNAPSHOT
t
PSU
t
IP
D7
D6
D5
D4
D3
D2
D1
D0
N
PORT SNAPSHOT
INT REMAINS HIGH UNTIL STOP CONDITION
I0
I1
I2
I3
I4
I5
I6
I7
F0
F1
F2
F3
F4
F5
F6
F7
PORT INPUTS
INTERRUPT FLAGS
Figure 7. Reading from the MAX7319 (2 Data Bytes)
Input port data is sampled during the preceding I
2
C
acknowledge bit (the acknowledge bit for the I
2
C slave
address in the case of a single-byte or 2-byte read).
A
single-byte write
to the MAX7319 sets the interrupt
mask register, and clears both the internal transition
flags and the
INT
output.
A
multibyte write
to the MAX7319 sets the interrupt
mask register repeatedly.
Reading from the MAX7319
A read from the MAX7319 starts with the master trans-
mitting the MAX7319
’
s slave address with the R/
W
bit
set high. The MAX7319 acknowledges the slave
address and samples the input ports during acknowl-
edge bit.
INT
deasserts during the slave address
acknowledge.
Typically, the master reads 1 or 2 bytes from the
MAX7319, with each byte, except the last one, being
acknowledged by the master upon reception.
When the master reads 1 byte from the MAX7319 and
subsequently issues a STOP condition (Figure 6), the
MAX7319 transmits the current port data, clears the
transition flags, and resets the transition detection.
INT
deasserts during the slave address acknowledge. The
new snapshot data is the current port data transmitted
to the master; therefore, port transitions ocurring during
the transmission are detected.
INT
remains high until
the STOP condition.
When the master reads 2 bytes from the MAX7319 and
subsequently issues a STOP condition (Figure 7), the
MAX7319 transmits the current port data, followed by
the transition flags. The transition flags are cleared, and
transition detection reset.
INT
deasserts during the
slave address acknowledge. The new snapshot data is
the current port data transmitted to the master; there-
fore, port transitions occurring during the transmission
are detected.
INT
remains high until the STOP condi-
tion. When the master reads more than 2 bytes, the
input port data alternates with the transition flag.
S = START CONDITION
P = STOP CONDITION
SHADED = SLAVE TRANSMISSION
N = NOT ACKNOWLEDGE
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參數(shù)描述
MAX7319AEE 功能描述:接口-I/O擴(kuò)展器 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(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
MAX7319AEE+ 功能描述:接口-I/O擴(kuò)展器 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(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
MAX7319AEE+T 制造商:Maxim Integrated Products 功能描述:I2C PORT EXPANDER 16QSOP - Tape and Reel
MAX7319AEE-T 功能描述:接口-I/O擴(kuò)展器 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(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
MAX7319ATE 功能描述:接口-I/O擴(kuò)展器 I2C Port Expander 8 Input 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(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
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