Datasheet > XR19L402_09

XR19L402_09

更新时间： 2024-02-10 07:52:26

品牌	Logo	应用领域
艾科嘉 - EXAR		/
页数	文件大小	规格书
49页	1066K
描述
TWO CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER

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数据手册

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XR19L402_09 数据手册

XR19L402

TWO CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER

JULY 2009

REV. 1.0.3

APPLICATIONS

GENERAL DESCRIPTION

• Battery-Powered Equipment

• Handheld and Mobile Devices

• Handheld Terminals

• Industrial Peripheral Interfaces

• Point-of-Sale (POS) Systems

The XR19L402 (L402) is a highly integrated device that

combines

full-featured two channel Universal

Asynchronous Receiver and Transmitter (UART) and RS-

485 transceivers. The L402 is designed to operate with a

single 3.3V or 5V power supply. The L402 is fully compliant

with RS-485 Standards.

The L402 operates in four different modes: Active, Partial

Sleep, Full Sleep and Power-Save. Each mode can be

invoked via hardware or software. Upon power-up, the

L402 is in the Active mode where the UART and RS-485

transceiver function normally. In the Partial Sleep mode, the

internal crystal oscillator of the UART or charge pump of the

RS-485 transceiver is turned off. In Full Sleep mode, both

the crystal oscillator and the charge pump are turned off.

While the UART is in the Sleep mode, the Power-Save

mode isolates the core logic from the control signals (chip

select, read/write strobes, address and data bus lines) to

minimize the power consumption. The RS-485 receivers

remain active in any of these four modes.

FEATURES

• Meets true RS-485 Standards at 3.3V or 5V operation

• Up to 8 Mbps data transmission rate

• 45us sleep mode exit (charge pump to full power)

• ESD protection for RS-485 I/O pins at

■ +/-15kV - Human Body Model

■ +/- 8kV - IEC 61000-4-2, Contact Discharge

■ +/- 15kV - IEC 61000-4-2, Air-Gap Discharge

• Software compatible with industry standard 16550 UART

• Intel/Motorola bus select

• Complete modem interface

• Sleep and Power-save modes to conserve battery power

• Wake-up interrupt upon exiting low power modes

FIGURE 1. BLOCK DIAGRAM

*5 V Tolerant

Inputs

Crystal

PwrSave

Charge Pump

BRG

Osc/Buffer

A2:A0

D7:D0

IOR#

64 Byte

TX FIFO

TXA+

TXA-

TXA

RXA

IOW# (R/W#)

CSA# (CS#)

CSB#

RXA+

RXA-

64 Byte

RX FIFO

VCC33

INTA (IRQ#)

INTB

CTSA#

DSRA#

RIA#

RS-485 Transceiver

Modem

I/Os

RESET (RESET#)

I/M#

CDA#

TEST_EN

Channel A

TXB+

TXB

RXB

HALF/FULLA#

TXB-

RXB+

Channel B

( Similar to

ChannelA )

HALF/FULLB#

RXBSEL

RXB-

TXB

RXB

UART

XR19L402

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

12 3 4 5 6 7...49

中文翻译

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与XR19L402_09相关器件

型号	品牌	获取价格	描述	数据表
XR19L402IL48	EXAR	获取价格	TWO CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER
XR19L402IL48-F	EXAR	获取价格	Serial I/O Controller, 2 Channel(s), 1MBps, CMOS, 7 X 7 MM, 0.90 MM HEIGHT, 0.50 MM PITCH,
XR1A1B050H	KYOCERA AVX	获取价格	Data Line Filter, 1 Function(s), 100V, 10A,
XR1A1B050Y	KYOCERA AVX	获取价格	Data Line Filter, 1 Function(s), 100V, 10A,
XR1A1B050Z	KYOCERA AVX	获取价格	Data Line Filter, 1 Function(s), 100V, 10A,
XR1A1B154H	KYOCERA AVX	获取价格	Data Line Filter, 1 Function(s), 100V, 10A,
XR1A1B154Y	KYOCERA AVX	获取价格	Data Line Filter, 1 Function(s), 100V, 10A,
XR1A1B154Z	KYOCERA AVX	获取价格	Data Line Filter, 1 Function(s), 100V, 10A,
XR1A1S050H	KYOCERA AVX	获取价格	Data Line Filter, 1 Function(s), 100V, 10A,
XR1A1S050Y	KYOCERA AVX	获取价格	Data Line Filter, 1 Function(s), 100V, 10A,

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