參數(shù)資料
型號： XR19L402IL48-0B-EB
廠商： Exar Corporation
文件頁數(shù)： 1/49頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR19L402-B 48QFN
標(biāo)準(zhǔn)包裝： 1
系列： *
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com
XR19L402
TWO CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER
JULY 2009
REV. 1.0.3
GENERAL DESCRIPTION
The XR19L402 (L402) is a highly integrated device that
combines
a
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.
APPLICATIONS
Battery-Powered Equipment
Handheld and Mobile Devices
Handheld Terminals
Industrial Peripheral Interfaces
Point-of-Sale (POS) Systems
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
XR19L402
UART
RS-485 Transceiver
Int
el
or
Moto
rol
aBus
In
ter
face
PwrSave
A2:A0
D7:D0
IOR#
IOW# (R/W#)
CSA# (CS#)
CSB#
INTA (IRQ#)
INTB
RESET (RESET#)
I/M#
Crystal
Osc/Buffer
XT
A
L1
XT
A
L2
BRG
64 Byte
TX FIFO
64 Byte
RX FIFO
Modem
I/Os
UART
R
e
gist
ers
CTSA#
DSRA#
RIA#
Charge Pump
AC
P
C1
+
C1
-
VC
C33
*5 V Tolerant
Inputs
GN
D
R_E
N
CDA#
VCC33
RXA
RXA+
RXA-
TXA
TXA+
TXA-
Channel B
( Similar to
ChannelA )
RXB
TXB
Channel A
VCC50
TEST_EN
RXBSEL
HALF/FULLB#
HALF/FULLA#
RXB
RXB+
RXB-
TXB
TXB+
TXB-
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