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參數資料
| 型號： | LM8333 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Keypad Controller with I/O Expansion and ACCESS.bus Host Interface |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, BGA49 |
| 封裝： | MICRO, BGA-49 |
| 文件頁數： | 5/17頁 |
| 文件大?。?/td> | 768K |
| 代理商： | LM8333 |
6.0 Typical Application
6.1 I/O EXPANSION OPTIONS
One host-programmable PWM output which also may be
used as a general-purpose output.
Four host-programmable general-purpose I/O pins, GE-
N_IO_0, GEN_IO_1, GEN_IO_2, and GEN_IO_3. GE-
N_IO_0 and GEN_IO_1 can also be configured for “slow”
interrupts, in which any transition will trigger a hardware
interrupt event to the host.
6.2 WATCHDOG TIMER
The watchdog timer is always enabled in hardware. To use
the timer, connect the WD_OUT output to the RESET input.
6.3 HALT MODE
The fully static architecture of the LM8333 allows stopping
the internal RC clock in Halt mode, which reduces power
consumption to the minimum level.
Halt mode is entered when no key-press, key-release, or
ACCESS.bus activity is detected for a certain period of time
(by default, 500 milliseconds). The mechanism for entering
Halt mode is always enabled in hardware, but the host can
program the period of inactivity which triggers entry into Halt
mode.
The LM8333 will remain in Active mode as long as a key
event, or any other event, which causes the IRQ output to be
asserted is not resolved.
6.3.1 ACCESS.bus Activity
When the LM8333 is in Halt mode, any activity on the
ACCESS.bus interface will cause the LM8333 to exit from
Halt mode. However, the LM8333 will not be able to ac-
knowledge the first bus cycle immediately following wake-up
from Halt mode. It will respond with a negative acknowledge-
ment, and the host should then repeat the cycle.
The LM8333 will be prevented from entering Halt mode if it
shares the bus with peripherals that are continuously active.
For lowest power consumption, the LM8333 should only
share the bus with peripherals that require little or no bus
activity after system initialization.
20210603
FIGURE 1. Typical Keypad Configuration
L
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM8333_07 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface |
| LM8333EVALKIT | 功能描述:其他開發(fā)工具 LM8333 AND SOFTWARE EVAL KIT RoHS:否 制造商:Parallax 產品:ELEV-8 Hex Upgrade Kits 類型:Robotics 工具用于評估:ELEV-8 Quadcopter 工作電源電壓: |
| LM8333FLQ8X | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface |
| LM8333FLQ8X/NOPB | 功能描述:接口 - 專用 RoHS:否 制造商:Texas Instruments 產品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
| LM8333FLQ8Y | 制造商:Texas Instruments 功能描述:Mobile I/O Companion Supporting Key Scan 32-Pin LLP EP |
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