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參數(shù)資料
| 型號(hào)： | LM8333 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 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(yè)數(shù)： | 1/17頁(yè) |
| 文件大?。?/td> | 768K |
| 代理商： | LM8333 |
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LM8333
Keypad Controller with I/O Expansion and ACCESS.bus
Host Interface
1.0 General Description
The LM8333 is a general-purpose controller for matrix-
addressed keypads which provides an ACCESS.bus (I
2
C-
compatible) interface to a host microcontroller. It offloads the
burden of keyboard scanning from the host, while providing
extremely low power consumption in both operational and
standby modes. It supports keypad matrices up to 8 x 8 in
size (plus another 8 special-function keys), for portable ap-
plications such as cellphones, PDAs, games, and other
handheld applications.
Key press and release events are encoded into a byte format
and loaded into a FIFO buffer for retrieval by the host pro-
cessor. An interrupt output (IRQ) is used to signal events
such as keypad activity, a state change on either of two
interrupt-capable general-purpose I/O pins, or an error con-
dition. Interrupt and error codes are available to the host by
reading dedicated registers.
Four general-purpose I/O pins are available, two of which
have interrupt capability. A pulse-width modulated output
based on a host-programmable internal timer is also avail-
able, which can be used as a general-purpose output if the
PWM function is not required.
To minimize power, the LM8333 automatically enters a low-
power standby mode when there is no keypad, I/O, or host
activity.
The device is packaged in a 49-pin MICRO-ARRAY chip-
scale package.
2.0 Features
n
8 x 8 standard keys
n
8 special function keys (SF keys) providing a total of 72
keys for the maximum keyboard matrix
n
ACCESS.bus (I
2
C-compatible) communication interface
to the host
n
Four general purpose host programmable I/O pins with
two optional (slow) external Interrupts
n
16 byte FIFO buffer to store key pressed and key
released events
n
Error control with error reports on (FIFO overrun,
Keypad overrun, invalid command)
n
Host programmable PWM
n
Host programmable active time and debounce time
3.0 Block Diagram
20210601
September 2006
L
2006 National Semiconductor Corporation
DS202106
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM8333_07 | 制造商:NSC 制造商全稱(chēng):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(kāi)發(fā)工具 LM8333 AND SOFTWARE EVAL KIT RoHS:否 制造商:Parallax 產(chǎn)品:ELEV-8 Hex Upgrade Kits 類(lèi)型:Robotics 工具用于評(píng)估:ELEV-8 Quadcopter 工作電源電壓: |
| LM8333FLQ8X | 制造商:NSC 制造商全稱(chēng):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(zhuān)用 RoHS:否 制造商:Texas Instruments 產(chǎn)品類(lèi)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(fēng)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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