XR19L200IL32-0B-EB datasheet, PDF

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XR19L200IL32-0B-EB: DescriptionEVAL BOARD FOR XR19L200 32QFN; CategoryDevelopment board/suite/development tools; File Size280KB，40 Pages; ManufacturerMaxLinear Inc.; Environmental Compliance

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EVAL BOARD FOR XR19L200 32QFN

XR19L200IL32-0B-EB Parametric

Parameter Name	Attribute value
type	interface
Function	UART
Embedded	-
IC/parts used	XR19L200
Main attributes	1 channel (single channel)
What's included	plate
Auxiliary properties	-

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XR19L200

SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

JULY 2007

REV. 1.0.2

GENERAL DESCRIPTION

The XR19L200 (L200) is a highly integrated device that

combines a single channel Universal Asynchronous

Receiver and Transmitter (UART) and an RS-232

transceiver. The L200 is designed to operate with a single

3.3V or 5V power supply. The L200 is fully compliant with

EIA/TIA-232-F Standards from a +3.0V to +5.5V power

supply. The device operates at 250 Kbps data rate with

worst case 3K ohms load. Both RS-232 driver outputs and

receiver inputs can operate in harsh electrical environments

of +/-15V without damage and can survive multiple +/-15kV

ESD on the RS-232 lines, while maintaining RS-232 output

levels.

The L200 operates in three different modes: Awake, Partial

Sleep, and Full Sleep. Each mode can be invoked via

hardware or software. In the Awake mode, all functions are

active. In the Partial Sleep mode, the internal crystal

oscillator or charge pump is turned off. In Full Sleep mode,

the internal crystal oscillator and the charge pump is shut

down. All the RS-232 receivers remain active in any of

these four modes.

APPLICATIONS

•

Battery-Powered Equipment

•

Handheld and Mobile Devices

•

Handheld Terminals

•

Industrial Peripheral Interfaces

•

Point-of-Sale (POS) Systems

FEATURES

•

Meets true EIA/TIA-232-F Standards from a 3.0 V to 5.5V

operation

•

Up to 250 Kbps data transmission rate

•

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

•

ESD protection for RS-232 I/O pins at

■

+/-15kV - Human Body Model

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

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

•

Software compatible with industry standard 16550 UART

•

Intel/Motorola bus select

•

Quarter-modem interface (TXD, RXD)

•

Sleep modes to conserve battery power

•

Wake-up interrupt upon exiting low power modes

IGURE

1. B

LOCK

IAGRAM

VCC

(3.0 to 5.5V)

XTAL1

XTAL2

GND

ACP

C2+

C1+

C2-

C1-

VREF+

Crystal

Osc/Buffer

BRG

Charge Pump

VREF-

A2:A0

D7:D0

IOR#

IOW# (R/W#)

CS#

INT (IRQ#)

RESET (RESET#)

I/M#

*5 V

Tolerant

Inputs

Intel or Motorola Bus Interface

UART Registers

16 Byte

TX FIFO

16 Byte

RX FIFO

TXD

RXD

Modem

I/Os

UART

XR19L200

RS-232 Transceiver

Exar

Corporation 48720 Kato Road, Fremont CA, 94538

•

(510) 668-7000

•

FAX (510) 668-7017

•

www.exar.com

XR19L200

REV. 1.0.2

SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

1.0 PRODUCT DESCRIPTION

The XR19L200 interface converter consists of a full-functional UART with 16 bytes of transmit and receive

FIFO, a charge pump, two RS-232 drivers, two RS-232 receivers, and a sleep mode circuitry. It operates from

a single +3V to 5.5V supply at 250Kbps data rate, while meeting all EIA RS-232F specifications. Its feature set

is fully compatible to the XR16L580 device. Unlike the XR16L580, the modem signals are not CMOS/TTL

level, but conform to EIA/TIA 232 or RS-232 voltage levels. The configuration registers set is 16550 UART

compatible for control, status and data transfer. Also, the L200 has 16-bytes of transmit and receive FIFOs,

automatic Xon/Xoff and special character software flow control, transmit and receive FIFO trigger levels, and a

programmable baud rate generator with a prescaler of divide by 1 or 4. Additionally, the L200 includes the ACP

pin which the user can shut down the charge pump for the RS-232 drivers when the L200 is already in sleep

mode. The L200 is fabricated using an advanced CMOS process.

Enhanced Features

The L200 UART provides a solution that supports 16 bytes of transmit and receive FIFO memory. The L200 is

designed to work with low supply voltage and high performance data communication systems that require fast

data processing time. Increased performance is realized in the L200 by the transmit and receive FIFOs, FIFO

trigger level controls and automatic flow control mechanism. This allows the external processor to handle more

networking tasks within a given time. This increases the service interval giving the external CPU additional time

for other applications and reducing the overall UART interrupt servicing time.

Intel or Motorola Data Bus Interface

The L200 provides a host interface that supports Intel or Motorola microprocessor (CPU) data bus interface.

The Intel bus compatible interface allows direct interconnect to Intel compatible type of CPUs using IOR#,

IOW# and CS# inputs for data bus operation. The Motorola bus compatible interface instead uses the R/W#

and CS# signals for data bus transactions. See pin description section for details on all the control signals. The

Intel and Motorola bus interface selection is made through the pin, I/M#.

Data Rate

The L200 is capable of operation up to 250Kbps data rate using the 16X internal sampling clock rate. The

UART section can operate at much higher speeds, but the speed of the RS-232 transceiver is limited to

250Kbps beyond which the L200 cannot comply with the EIA/TIA-232 electrical characteristics. The device can

operate either with a crystal on pins XTAL1 and XTAL2, or external clock source on XTAL1 pin.

Internal Enhanced Register Sets

The L200 UART has a set of enhanced registers providing control and monitoring functions. Interrupt enable/

disable and status, FIFO enable/disable, selectable TX and RX FIFO trigger levels, automatic hardware/

software flow control enable/disable, programmable baud rates, modem interface controls and status, and

sleep mode are all standard features. Following a power on reset or an external reset (and operating in 16 or

Intel Mode), the registers defaults to the reset condition and is compatible with the XR16L580.

RS-232 Interface

The L200 includes RS-232 drivers/receivers for the TXD and RXD signals (If more modem input and output

signals are needed, see the XR19L220 and XR19L210). This feature eliminates the need for an external RS-

232 transceiver. The charge pump provides output voltages of +5V and -5V for its drivers over the 3.0V to 5.5V

VCC supply voltage. The serial output TX swings between -5V (inactive) and 5V (active) RS-232 voltage

levels. The serial input RX is an RS-232 receiver and can take any voltage swing from -15V to +15V. The

receiver is always active, even in Partial or Full Sleep modes. The RS-232 drivers guarantee a data rate of

250Kbps even when fully loaded with 3Kohm in parallel with 1000pF load. Also, the slew rate of the driver

output is internally limited to a maximum of 30V/us in order to meet the EIA-232F standard.

XR19L200IL32-0B-EB Related Products

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