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参数资料
| 型号： | MAX7360ETL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/32页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR KEY-SW I2C 40TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 控制器 |
| 输入类型： | 逻辑 |
| 输出类型： | 逻辑 |
| 接口： | I²C，2 线串口 |
| 电流 - 电源： | 50µA |
| 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（5x5） |
| 包装： | 管件 |
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17
Maxim Integrated
I2C-Interfaced Key-Switch Controller and LED
Driver/GPIOs with Integrated ESD Protection
MAX7360
Figure 10. Ghost-Key Phenomenon
Figure 11. Valid Three-Key Combinations
Ghost-Key Elimination
Ghost keys are a phenomenon inherent with key-switch
matrices. When three switches located at the corners
of a matrix rectangle are pressed simultaneously, the
switch that is located at the last corner of the rectangle
(the ghost key) also appears to be pressed. This occurs
because the potentials at the two sides of the ghost-key
switch are identical due to the other three connections—
the switch is electrically shorted by the combination of
the other three switches (Figure 10). Because the key
appears to be pressed electrically, it is impossible to
detect which of the four keys is the ghost key.
The MAX7360 employs a proprietary scheme that detects
any three-key combination that generates a fourth ghost
key, and does not report the third key that causes a
ghost-key event. This means that although ghost keys
are never reported, many combinations of three keys
are effectively ignored when pressed at the same time.
Applications requiring three-key combinations (such
as <Ctrl><Alt><Del>) must ensure that the three keys
are not wired in positions that define the vertices of a
rectangle (Figure 11). There is no limit on the number of
keys that can be pressed simultaneously as long as the
keys do not generate ghost-key events and FIFO is not full.
Low-EMI Operation
The MAX7360 uses two techniques to minimize EMI
radiating from the key-switch wiring. First, the voltage
across the switch matrix never exceeds +0.55V if not
in sleep mode, independent of supply voltage VCC.
This reduces the voltage swing at any node when a
switch is pressed to +0.55V maximum. Second, the keys
are not dynamically scanned, which would cause the
key-switch wiring to continuously radiate interference.
Instead, the keys are monitored for current draw (only
occurs when pressed), and debounce circuitry only
operates when one or more keys are actually pressed.
Switch On-Resistance
The MAX7360 is designed to be insensitive to resistance,
either in the key switches, or the switch routing to and
from the appropriate COL_ and ROW_ up to 4kI (max).
These controllers are therefore compatible with low-cost
membrane and conductive carbon switches.
Hot Insertion
The INTI, INTK, SCL, and AD0 inputs and SDA remain
high impedance with up to +3.6V asserted on them
when the MAX7360 powers down (VCC = 0). I/O ports
(PORT0–PORT7) remain high impedance with up to
+14V asserted on them when not powered. Use the
MAX7360 in hot-swap applications.
Staggered PWM
The LED’s on-time in each PWM cycle are phase
delayed 45N into eight evenly spaced start positions.
Optimize phasing when using fewer than eight ports as
constant-current outputs by allocating the ports with the
most appropriate start positions. For example, if using
four constant-current outputs, choose PORT0, PORT2,
PORT4, and PORT6 because their PWM start positions
are evenly spaced. In general, choose the ports that
spread the PWM start positions as evenly as possible.
This optimally spreads out the current demand from the
ports’ load supply.
INTK/INTI
There are two interrupt outputs, INTK and INTI. Each
interrupt operates independently from the other. See
the Key-Switch Interrupt Register (0x03) and the GPIO
Port Interrupts (INTI) sections for additional information
regarding these two interrupts.
Power-Supply Considerations
The MAX7360 operates with a +1.62V to +3.6V power-
supply voltage. Bypass the power supply to GND with a
0.1FF or higher ceramic capacitor as close as possible
to the device.
REGULAR KEYPRESS
EVENT
GHOST-KEY
EVENT
KEY-SWITCH MATRIX
EXAMPLES OF VALID THREE-KEY COMBINATIONS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7360ETL+ | 功能描述:外围驱动器与原件 - PCI Key-Switch Ctlr & LED Driver/GPIO RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX7360ETL+T | 功能描述:外围驱动器与原件 - PCI Key-Switch Ctlr & LED Driver/GPIO RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX7360EVKIT+ | 制造商:Maxim Integrated Products 功能描述:I2C-INTERFACED KEY-SWITCH CONTROLLE - Boxed Product (Development Kits) |
| MAX7360EWX+ | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:I2C-Interfaced Key-Switch Controller and LED Driver/GPIOs with Integrated ESD Protection |
| MAX7360EWX+T | 功能描述:外围驱动器与原件 - PCI Key-Switch Ctlr & LED Driver/GPIO RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
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