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LM8333FLQ8X

更新时间： 2024-11-24 03:40:19

品牌	Logo	应用领域
美国国家半导体 - NSC		外围集成电路
页数	文件大小	规格书
18页	621K
描述
Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface

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LM8333FLQ8X 数据手册

August 2007

LM8333

Mobile I/O Companion Supporting Key-Scan, I/O

Expansion, PWM, and ACCESS.bus Host Interface

The device is packaged in a 32–pin Leadless Leadframe

package (LLP) and a 49-pin MICRO-ARRAY . Both are chip-

scale packages.

1.0 General Description

The LM8333 Mobile I/O Companion 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 × 8 in size (plus

another 8 special-function keys), for portable applications

such as cellphones, PDAs, games, and other handheld ap-

plications.

2.0 Features

8 × 8 standard keys

■

8 special function keys (SF keys) providing a total of 72

keys for the maximum keyboard matrix

ACCESS.bus (I²C-compatible) communication interface

to the host

■

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 condition. In-

terrupt and error codes are available to the host by reading

dedicated registers.

Four general purpose host programmable I/O pins with

two optional (slow) external Interrupts

■

16 byte FIFO buffer to store key pressed and key released

events

■

Error control with error reports on (FIFO overrun, Keypad

overrun, invalid command)

■

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.

Host programmable PWM

■

Host programmable active time and debounce time

3.0 Applications

To minimize power, the LM8333 automatically enters a low-

power standby mode when there is no keypad, I/O, or host

activity.

Mobile phones

■

Personal Digital Assistants (PDAs)

Smart handheld devices

Personal media players

4.0 Block Diagram

20210601

I2C^®is a registered trademark of Phillips Corporation.

202106

www.national.com

12 3 4 5 6 7...18

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与LM8333FLQ8X相关器件

型号	品牌	获取价格	描述	数据表
LM8333FLQ8X/NOPB	ROCHESTER	获取价格	SPECIALTY MICROPROCESSOR CIRCUIT, QCC32, ROHS COMPLIANT, LLP-32
LM8333FLQ8X/NOPB	TI	获取价格	移动 I/O 配套支持 Key-Scan、I/O 扩展、PWM 和 ACCESS.bus
LM8333FLQ8Y	NSC	获取价格	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interfac
LM8333FLQ8Y/NOPB	NSC	获取价格	IC SPECIALTY MICROPROCESSOR CIRCUIT, QCC32, ROHS COMPLIANT, LLP-32, Microprocessor IC:Othe
LM8333FLQ8Y/NOPB	TI	获取价格	移动 I/O 配套支持 Key-Scan、I/O 扩展、PWM 和 ACCESS.bus
LM8333GGR8	NSC	获取价格	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interfac
LM8333GGR8/NOPB	NSC	获取价格	IC SPECIALTY MICROPROCESSOR CIRCUIT, PBGA49, ROHS COMPLIANT, MICRO ARRAY-49, Microprocesso
LM8333GGR8/NOPB	TI	获取价格	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interfac
LM8333GGR8AXS/NOPB	TI	获取价格	移动 I/O 配套支持 Key-Scan、I/O 扩展、PWM 和 ACCESS.bus
LM8333GGR8AXSX/NOPB	TI	获取价格	移动 I/O 配套支持 Key-Scan、I/O 扩展、PWM 和 ACCESS.bus

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