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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)： | 6/16頁(yè) |
| 文件大?。?/td> | 251K |
| 代理商： | MAX7319 |
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M
changes. An input change sets one of eight flag bits
that identify changed input(s). All flags are cleared
upon a subsequent read or write transaction to the
MAX7319.
A latching interrupt output,
INT,
is programmed to flag
input data changes on input ports through an interrupt
mask register. By default, data changes on any input
port force
INT
to a logic-low. The interrupt output,
INT,
and all transition flags are cleared when the MAX7319
is next accessed through the serial interface.
Internal pullup resistors to V+ are selected by the
address-select inputs, AD0 and AD2. Pullups are
enabled on the input ports in groups of four (see Table 3).
Initial Power-Up
On power-up, the transition detection logic is reset, and
INT
is released to a high-impedance state. The inter-
rupt mask register is set to 0xFF, enabling the interrupt
output for transitions on all eight input ports. The transi-
tion flags are cleared to indicate no data changes.
RST Input
The
RST
input voids any I
2
C transaction involving the
MAX7319, forcing the MAX7319 into the I
2
C STOP con-
dition. A reset does not affect the interrupt output (
INT
)
or change the contents of the interrupt mask register.
RST
is overvoltage tolerant to +6V.
Standby Mode
When the serial interface is idle, the MAX7319 automat-
ically enters standby mode, drawing minimal supply
current.
Slave Address and Input Pullup Selection
Address inputs AD0 and AD2 determine the MAX7319
slave address and select which inputs have pullup
resistors. Pullups are enabled on the input ports in
groups of four (see Table 3). The MAX7319, MAX7321,
MAX7322, and MAX7323 use a different range of slave
addresses (110xxxx) than the MAX7320 (101xxxx).
The MAX7319 slave address is determined on each I
2
C
transmission, regardless of whether the transmission is
actually addressing the MAX7319. The MAX7319 distin-
guishes whether address inputs AD2 and AD0 are con-
nected to SDA or SCL instead of fixed logic levels V+
or GND during this transmission. This means that the
MAX7319 slave address can be configured dynamically
in the application without cycling the device supply.
On initial power-up, the MAX7319 cannot decode the
address inputs AD2 and AD0 fully until the first I
2
C
transmission. AD0 and AD2 initially appear to be con-
nected to V+ or GND. This is important because the
address selection determines which inputs have
pullups applied. However, at power-up, the I
2
C SDA
and SCL bus interface lines are high impedance at the
pins of every device (master or slave) connected to the
bus, including the MAX7319. This is guaranteed as part
I
2
C Port Expander with Eight Inputs and
Maskable Transition Detection
6
_______________________________________________________________________________________
PART
I
2
C
SLAVE
ADDRESS
INPUTS
INPUT
INTERRUPT
MASK
OPEN-
DRAIN
OUTPUTS
PUSH-
PULL
OUTPUTS
APPLICATION
MAX7323
110xxxx
Up to 4
—
Up to 4
4
Four I/O, four output-only versions:
Four open-drain I/O ports with latching transition
detection interrupt and selectable pullups.
Four push-pull outputs with selectable power-up
default levels.
PCF8574-, PCF8574A-compatible versions:
Eight open-drain I/O ports with nonlatching transition
detection interrupt and pullups on all ports.
All ports power up as inputs (or logic-high outputs).
Any port can be used as an input by setting the
open-drain output to logic-high.
MAX7328
MAX7329
0100xxx
0111xxx
Up to 8
—
Up to 8
—
16-PORT EXPANDERS
MAX7324
MAX7325
MAX7326
MAX7327
8
Yes
—
Yes
—
—
8
8
12
12
Software equivalent to a MAX7320 plus a MAX7321.
Software equivalent to a MAX7320 plus a MAX7319.
Software equivalent to a MAX7320 plus a MAX7322.
Software equivalent to a MAX7320 plus a MAX7323.
Up to 8
4
Up to 4
Up to 8
—
Up to 4
101xxxx
and
110xxxx
Table 1. MAX7319
–
MAX7329 Family Comparison (continued)
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相關(guān)代理商/技術(shù)參數(shù) |
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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