Datasheet > LM8500

LM8500

更新时间： 2024-10-31 22:47:03

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器
页数	文件大小	规格书
20页	316K
描述
Four Wire Resistive Touchscreen Controller with Brownout

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中文翻译

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数据手册

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LM8500 数据手册

PRELIMINARY

October 2002

LM8300/LM8400/LM8500

Four Wire Resistive Touchscreen Controller with

Brownout

self-power down mode, the current drawn is typically less

General Description

than 2 µA. The device resumes normal operation when a

touch is detected on the touch screen or communication is

detected on the UART. In addition to the self-power down

mode, the controller can be disabled by pulling the SHUT-

DOWN pin low. The controller resumes normal operation

when the SHUTDOWN pin is tristated or pulled high.

The LM8300/8400/8500 is a 4-wire resistive touch screen

controller. The controller samples and drives the touch

screen without the need of any external hardware. The built

in 10-bit A/D provides a maximum of 500 coordinate pairs

per second (cpps). The data sampled from the touch screen

is sent out on the UART at a speed of 38400 bps.

The controller has an internal non-volatile memory storage

element to store configuration data such as calibration points

or controller configurations.

The controller has a power-saving mode which causes the

controller to self-power down when no touch is detected on

the touch screen for a specified amount of time. In the

Devices included in this datasheet:

Operating

Voltage

Brownout

Voltage

Operating

Frequency

I/O

Pins

Device

LM8300

LM8400

LM8500

Packages

Temperature

0˚C to +70˚C

44 LLP, 44 PLCC,

48 TSSOP

3, 5 V

5 V

2.7 to 2.9 V

3.27 MHz

44 LLP, 44 PLCC,

48 TSSOP

No Brownout

44 LLP, 44 PLCC,

48 TSSOP

4.17V to 4.5V 3.27, 10 MHz

n Controller configurations are stored in the internal

non-volatile storage element

n Touch pressure can be measured

Features

KEY FEATURES

n Supports 4 wire resistive touch panels

n Low power standby current typically less than 2 µA at

5.5V

n Maximum speed of 500 coordinate pairs per second

n Automatic wake up and return to standby

n 10 bit A/D

n On-chip touch screen current drivers - no external driver

required

n UART interface

APPLICATIONS

n Personal Digital Assistants

n Smart Hand-Held Devices

n Touch Screen Monitors

n Point-of-Sales Terminals

n KIOSK

n Pagers

n Cell Phones

™

COP8 is a trademark of National Semiconductor Corporation.

DS200372

www.national.com

12 3 4 5 6 7...20

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