LM8322 datasheet(1/42 Pages) NSC

номер детали	LM8322

подробное описание детали	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface

PDF	42 Pages

Scroll/Zoom	100%

производитель	NSC [National Semiconductor (TI)]

домашняя страница	http://www.national.com

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May 2007

LM8322

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

Expansion, PWM, and ACCESS.bus Host 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

Key Features

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

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.

■ Supports I2C-compatible ACCESS.bus interface in slave

mode up to 400 kHz (Fast-mode).

■ 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.

3.0 Applications

■ Mobile phones

■ Personal Digital Assistants (PDAs)

■ Smart handheld devices

■ Personal media players

4.0 Block Diagram

30013620

300136

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Аналогичное описание - LM8322

производитель	номер детали	датащи	подробное описание детали
National Semiconductor ...	LM8333	620Kb / 18P	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface
Texas Instruments	LM8323	597Kb / 46P	LM8323 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface
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	LM8333	1Mb / 26P	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface
	LM8333	1Mb / 26P	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM and ACCESS.bus Host Interface
	LM8323	1Mb / 47P	LM8323 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface
	LM8325-1	1Mb / 57P	LM8325-1 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface
	LM8327	1Mb / 65P	LM8327 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface
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