Datasheet > LM8322

LM8322

更新时间： 2024-11-24 05:42:23

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
42页	823K
描述
Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface

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LM8322 数据手册

May 2007

LM8322

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

Expansion, PWM, and ACCESS.bus Host Interface

Three host-programmable PWM outputs useful for smooth

LED brightness modulation.

Supports general-purpose I/O expansion on pins not

otherwise used for keypad interface.

Key-scan event storage in a FIFO buffer for up to 15

events.

Key events, errors, and dedicated hardware interrupts

request host service by asserting the IRQ output.

The correct reception of a command may be assumed, if

no error is reported from the LM8322 after receiving a

command.

Wake-up from Halt mode on any matrix key-scan event,

any use of the SF keys, or any activity on the ACCESS.bus

interface.

■

1.0 General Description

The LM8322 Mobile I/O Companion is a dedicated device to

unburden a host processor from scanning a matrix-addressed

keypad. In addition, the LM8322 provides general-purpose

I/O expansion, and PWM outputs useful for dynamic LED

brightness modulation.

It communicates with the host through an I²C-compatible

ACCESS.bus interface. An interrupt output is available for

signaling key-press and key-release events. Communication

frequencies up to 400 kHz (Fast-mode) bus speed are sup-

ported. The LM8322 supports a predefined set of commands.

These commands enable a host device to keep control over

all functions.

■

2.0 Features

3.0 Applications

Key Features

Mobile phones

■

Supports keypad matrices of up to 8 × 12 keys plus 8

■

Personal Digital Assistants (PDAs)

special-function (SF) keys for a total of 104 keys. SF keys

pull keypad scan inputs directly to ground, rather than

connecting to a keypad scan output.

Smart handheld devices

Personal media players

■

Supports I²C-compatible ACCESS.bus interface in slave

mode up to 400 kHz (Fast-mode).

■

4.0 Block Diagram

30013620

300136

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与LM8322相关器件

型号	品牌	获取价格	描述	数据表
LM8322GGR8	TI	获取价格	IC 16 I/O, PIA-GENERAL PURPOSE, PBGA36, BGA-36, Parallel IO Port
LM8322JGR8	NSC	获取价格	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interfac
LM8322JGR8/NOPB	TI	获取价格	SPECIALTY MICROPROCESSOR CIRCUIT, PBGA36, ROHS COMPLIANT, MICRO ARRAY-36
LM8322JGR8X	NSC	获取价格	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interfac
LM8322JGR8X/NOPB	TI	获取价格	SPECIALTY MICROPROCESSOR CIRCUIT, PBGA36, ROHS COMPLIANT, MICRO ARRAY-36
LM8322JGR8X/NOPB	NSC	获取价格	IC SPECIALTY MICROPROCESSOR CIRCUIT, PBGA36, ROHS COMPLIANT, MICRO ARRAY-36, Microprocesso
LM8323	TI	获取价格	LM8323 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host In
LM8325-1	TI	获取价格	LM8325-1 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host
LM8325-1GRA25A	TI	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PBGA25, MICRO ARRAY PACKAGE-25, Consumer IC:Other
LM8327	TI	获取价格	LM8327 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host In

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