LM8333 datasheet(1/17 Pages) NSC

Part #	LM8333

Description	Keypad Controller with I/O Expansion and ACCESS.bus Host Interface

PDF	17 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

Logo

1 / 17 page

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

2C-

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 to8x8in

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

2C-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

DS202106

www.national.com

Similar Part No. - LM8333

Manufacturer	Part #	Datasheet	Description
National Semiconductor ...	LM8333	620Kb / 18P	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface
Texas Instruments	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
	LM8333	834Kb / 26P	LM8333 Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface REVISED MAY 2013
National Semiconductor ...	LM8333FLQ8X	620Kb / 18P	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface

More results

Similar Description - LM8333

Manufacturer	Part #	Datasheet	Description
National Semiconductor ...	LM8333	620Kb / 18P	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface
National Semiconductor ...	LM8322	897Kb / 42P	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
	LM8327	740Kb / 72P	LM8327 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface
	LM8328	666Kb / 60P	LM8328 Mobile I/O Companion Supporting Keyscan, 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
	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
	LM8327	1Mb / 65P	LM8327 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface
	LM8328	1Mb / 56P	LM8328 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface

More results

LM8333 Datasheet(PDF) 1 Page - National Semiconductor (TI)

LM8333 Datasheet(HTML) 1 Page - National Semiconductor (TI)

Similar Part No. - LM8333

Similar Description - LM8333

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Datasheet Download

Link URL