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參數資料
| 型號： | 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端口擴展器，具有8路輸入，可屏蔽瞬態(tài)檢測 |
| 文件頁數： | 8/16頁 |
| 文件大小： | 251K |
| 代理商： | MAX7319 |
M
A long read sequence (more than 2 bytes) can be used
to poll the expander continuously without the overhead
of resending the slave address. If more than 2 bytes
are read from the expander, the expander repeatedly
returns the input port data followed by the transition
flags. The inputs are repeatedly resampled and the
transition flags repeatedly reset for each pair of bytes
read. All changes that occur during a long read sequence
are detected and reported.
The MAX7319 includes an 8-bit interrupt mask register
that selects which inputs generate an interrupt upon
change. Each input
’
s transition flag is set when its input
changes, independent of the interrupt mask register
settings. The interrupt mask register allows the proces-
sor to be interrupted for critical events, while the inputs
and the transition flags can be polled periodically to
detect less critical events.
The
INT
logic ensures that unnecessary interrupts are
not asserted, yet data transitions are detected and
reported regardless of when the transition occurs. The
INT
output is not reasserted during a read sequence to
avoid recursive reentry into an interrupt service routine.
If transition occurs during read sequence, the
INT
assertion is delayed until the STOP condition, however,
INT
is not reasserted upon a STOP condition if the
changed input data is read before the STOP occurs.
Transition-Detection Masks
The transition-detection logic incorporates a transition
flag and an interrupt mask bit for each input port. The
eight change flags can be read through the serial inter-
face, and the 8-bit interrupt mask is set through the ser-
ial interface.
Each port
’
s transition flag is set when that port
’
s input
changes, and the transition flag remains set even if the
input returns to its original state. The port
’
s interrupt
mask determines whether a transition on that input port
generates an interrupt. Enable interrupts for high-priori-
ty inputs using the interrupt mask. The interrupt allows
the system to respond quickly to changes on these
inputs. Poll the MAX7319 periodically to monitor less-
important inputs. The transition flags indicate whether a
permanent or transient change has occurred on any
input since the MAX7319 was last accessed.
Serial Interface
Serial Addressing
The MAX7319 operates as a slave that sends and
receives data through an I
2
C interface. The interface
uses a serial data line (SDA) and a serial clock line (SCL)
to achieve bidirectional communication between mas-
ter(s) and slave(s). The master initiates all data transfers
to and from the MAX7319 and generates the SCL clock
that synchronizes the data transfer (Figure 1).
I
2
C Port Expander with Eight Inputs and
Maskable Transition Detection
8
_______________________________________________________________________________________
PIN CONNECTION
AD2
SCL
SCL
SCL
SCL
SDA
SDA
SDA
SDA
GND
GND
GND
GND
V+
V+
V+
V+
DEVICE ADDRESS
A4
A3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
40k
INPUT PULLUP ENABLED
I6
I5
I4
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
—
—
—
—
—
—
—
—
—
—
—
—
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
AD0
GND
V+
SCL
SDA
GND
V+
SCL
SDA
GND
V+
SCL
SDA
GND
V+
SCL
SDA
A6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
A5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
A2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
A1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
I7
Y
Y
Y
Y
Y
Y
Y
Y
—
—
—
—
Y
Y
Y
Y
I3
—
Y
Y
Y
—
Y
Y
Y
—
Y
Y
Y
—
Y
Y
Y
I2
—
Y
Y
Y
—
Y
Y
Y
—
Y
Y
Y
—
Y
Y
Y
I1
—
Y
Y
Y
—
Y
Y
Y
—
Y
Y
Y
—
Y
Y
Y
I0
—
Y
Y
Y
—
Y
Y
Y
—
Y
Y
Y
—
Y
Y
Y
Table 3. MAX7319 Address Map
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相關代理商/技術參數 |
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|---|---|
| MAX7319AEE | 功能描述:接口-I/O擴展器 RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數量: 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 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7319AEE+ | 功能描述:接口-I/O擴展器 RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數量: 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 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
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