- 您现在的位置：买卖IC网 > PDF目录3773 > MAX7301AAX+ (Maxim Integrated Products)IC I/O EXPANDER SPI 28B 36SSOP PDF资料下载
参数资料
| 型号： | MAX7301AAX+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/17页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER SPI 28B 36SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 接口： | SPI/QSPI?/MICROWIRE? |
| 输入/输出数： | 28 |
| 中断输出： | 是 |
| 频率 - 时钟： | 26MHz |
| 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： | 36-BSOP（0.295"，7.50mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1424 (CN2011-ZH PDF) |
MAX7301
Initial Power-Up
On initial power-up, all control registers are reset, and
the MAX7301 enters shutdown mode (Table 4).
Transition (Port Data Change) Detection
Port transition detection allows any combination of the
seven ports P24–P30 to be continuously monitored for
changes in their logic status (Figure 5). A detected
change is flagged on port P31, which is used as an
active-high interrupt output (INT). Note that the
MAX7301 does not identify which specific port(s)
caused the interrupt, but provides an alert that one or
more port levels have changed.
The mask register contains 7 mask bits that select
which of the seven ports, P24–P30 are to be monitored
(Table 8). Set the appropriate mask bit to enable that
port for transition detect. Clear the mask bit if transitions
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.
Port P31 must be configured as an output in order to
work as the interrupt output INT when transition detec-
tion is used. Port P31 is set as output by writing bit D7
= 0 and bit D6 = 1 to the port configuration register
(Table 1).
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 7). Whenever
the configuration register is written with the M bit set,
the MAX7301 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
output port P31 goes low, if it was not already low.
Once transition detection is enabled, the MAX7301
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), INT output port P31 is latched high.
The INT output is not cleared if more changes occur or
if the data pattern returns to its original snapshot condi-
tion. The only way to clear INT is to access (read or
write) the transition detection mask register (Table 8).
Transition detection is a one-shot event. When INT has
been cleared after responding to a transition event,
transition 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.
4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
28-Port I/O Expander
8
_______________________________________________________________________________________
tCSH
tCL
tCSS
tCH
tCSH
CS
SCLK
DIN
DOUT
tDS
tDH
tDO
Figure 2. 4-Wire Interface
相关PDF资料 |
PDF描述 |
|---|---|
| ATMEGA48PA-MNR | MCU AVR 4KB FLASH 20MHZ 28QFN |
| ATTINY13-20SSQR | IC MCU AVR 1KB FLASH 20MHZ 8SOIC |
| 243-240-318 | POLARIZING KEY |
| 145286-2 | SEC CART RET MODULE ASSM/HSCF |
| MAX7300AAX+ | IC I/O EXPANDER I2C 28B 36SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7301AAX+ | 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 |
| MAX7301AAX+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 |
| MAX7301AAXT | 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 |
| MAX7301AAX-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 |
| MAX7301AGL | 制造商:Maxim Integrated Products 功能描述:3-WIRE-INTERFACED, 2.5V TO 5.5V, 20-PORT AND - Bulk |
发布紧急采购，3分钟左右您将得到回复。