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参数资料
| 型号： | MAX7300ATL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER 2WIRE 40TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 接口： | I²C，2 线串口 |
| 输入/输出数： | 28 |
| 中断输出： | 是 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
| 包装： | 管件 |
MAX7300
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port I/O Expander
______________________________________________________________________________________
11
tions on that port are to be ignored. Transition detection
works regardless of whether the port being monitored is
set to input or output, but generally, it is not particularly
useful to enable transition detection for outputs.
To use transition detection, first set up the mask regis-
ter and configure port P31 as an output, as described
above. Then enable transition detection by setting the
M bit in the configuration register (Table 9). Whenever
the configuration register is written with the M bit set,
the MAX7300 updates an internal 7-bit snapshot regis-
ter, which holds the comparison copy of the logic states
of ports P24 through P30. The update action occurs
regardless of the previous state of the M bit, so that it is
not necessary to clear the M bit and then set it again to
update the snapshot register.
When the configuration register is written with the M bit
set, transition detection is enabled and remains
enabled until either the configuration register is written
with the M bit clear, or a transition is detected. The INT
status bit (transition detection mask register bit D7)
goes low. Port P31 (if enabled as INT output) also goes
low, if it was not already low.
Once transition detection is enabled, the MAX7300
continuously compares the snapshot register against
the changing states of P24 through P31. If a change on
any of the monitored ports is detected, even for a short
time (like a pulse), the INT status bit (transition detec-
tion mask register bit D7) is set. Port P31 (if enabled as
INT output) also goes high. The INT output and INT sta-
tus bit are not cleared if more changes occur or if the
data pattern returns to its original snapshot condition.
The only way to clear INT is to access (read or write)
the transition detection mask register (Table 10). So if
the transition detection mask register is read twice in
succession after a transition event, the first time reads
with bit D7 set (identifying the event), and the second
time reads with bit D7 clear.
Transition detection is a one-shot event. When INT has
been cleared after responding to a transition event, tran-
sition detection is automatically disabled, even though
the M bit in the configuration register remains set (unless
cleared by the user). Reenable transition detection by
writing the configuration register with the M bit set to
take a new snapshot of the seven ports P24 to P30.
External Component RISET
The MAX7300 uses an external resistor, RISET, to set
internal biasing. Use a resistor value of 39k
.
Applications Information
Low-Voltage Operation
The MAX7300 operates down to 2V supply voltage
(although the sourcing and sinking currents are not guar-
anteed), providing that the MAX7300 is powered up ini-
tially to at least 2.5V to trigger the device’s internal reset.
Serial Interface Latency
When a MAX7300 register is written through the I2C
interface, the register is updated on the rising edge of
SCL during the data byte’s acknowledge bit (Figure 5).
The delay from the rising edge of SCL to the internal
register being updated can range from 50ns to 350ns.
SA
A
P
0
SLAVE ADDRESS
COMMAND BYTE
ACKNOWLEDGE FROM MAX7300
R/W
ACKNOWLEDGE FROM MAX7300
D15 D14 D13 D12 D11 D10
D9
D8
COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION
Figure 7. Command Byte Received
SA
A
P
0
SLAVE ADDRESS
COMMAND BYTE
DATA BYTE
ACKNOWLEDGE FROM MAX7300
1 BYTE
AUTOINCREMENT MEMORY WORD ADDRESS
D15 D14
D13 D12
D11 D10
D9
D8
D1
D0
D3
D2
D5
D4
D7
D6
HOW COMMAND BYTE AND DATA BYTE MAP INTO MAX7300’s REGISTER
ACKNOWLEDGE FROM MAX7300
R/W
Figure 8. Command and Single Data Byte Received
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7300ATL+ | 功能描述:接口-I/O扩展器 2.5-5.5V 20/28 Port I/O Expander RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| MAX7300ATL+T | 功能描述:接口-I/O扩展器 2.5-5.5V 20/28 Port I/O Expander RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| MAX7301 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander |
| MAX7301_06 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander |
| MAX7301AAI | 功能描述:接口-I/O扩展器 2.5-5.5V 20/28 Port I/O Expander RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
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