REV. 1.0.3 2.2 5-Volt Tolerant Inputs The CMOS/TTL level inputs " />
參數(shù)資料
型號(hào)： XR19L400IL40TR-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 45/46頁(yè)
文件大小： 0K
描述： IC UART/TXRX RS485 40QFN
標(biāo)準(zhǔn)包裝： 3,000
特點(diǎn)： *
通道數(shù)： 1，UART
FIFO's： 64 字節(jié)
規(guī)程： RS485
電源電壓： 3.3V，5V
帶自動(dòng)流量控制功能： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
帶調(diào)制解調(diào)器控制功能： 是
帶CMOS： 是
安裝類(lèi)型： 表面貼裝
封裝/外殼： 40-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 40-QFN 裸露焊盤(pán)（6x6）
包裝： 帶卷 (TR)
XR19L400
8
SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER
REV. 1.0.3
2.2
5-Volt Tolerant Inputs
The CMOS/TTL level inputs of the L400 can accept up to 5V inputs when operating at 3.3V. Note that the
XTAL1 pin is not 5V tolerant when an external clock supply is used.
2.3
Device Hardware Reset
The RESET or RESET# input resets the internal registers and the serial interface outputs in both channels to
their default state (see Table 14). An active pulse of longer than 40 ns duration will be required to activate the
reset function in the device.
2.4
Device Identification and Revision
The XR19L400 provides a Device Identification code and a Device Revision code to distinguish the part from
other devices and revisions. To read the identification code from the part, it is required to set the baud rate
generator registers DLL and DLM both to 0x00. Now reading the content of the DLM will provide 0x01 and
reading the content of DLL will provide the revision of the part; for example, a reading of 0x01 means revision
A.
2.5
Channel Internal Registers
Each UART channel in the L400 has a set of enhanced registers for control, monitoring and data loading and
unloading. The configuration register set is compatible to those already available in the standard single
16C550 and dual ST16C2550. These registers function as data holding registers (THR/RHR), interrupt status
and control registers (ISR/IER), a FIFO control register (FCR), receive line status and control registers (LSR/
LCR), modem status and control registers (MSR/MCR), programmable data rate (clock) divisor registers (DLL/
DLM), and an user accessible Scratchpad register (SPR).
Beyond the general 16C2550 features and capabilities, the L400 offers enhanced feature registers, namely,
EFR, Xon/Xoff 1, Xon/Xoff 2, FCTR, TRG, EMSR and FC that provide Xon/Xoff software flow control, FIFO
trigger level control and FIFO level counters. All the register functions are discussed in full detail later in
2.6
INT (IRQ#) Output
The interrupt output changes according to the operating mode and enhanced features setup. Table 1 and
Table 2 below summarize the operating behavior for the transmitter and receiver in the Intel and Motorola
modes. Also see Figures 18 through 21.
TABLE 1: INT (IRQ#) PIN OPERATION FOR TRANSMITTER
FCR BIT-0 = 0 (FIFO DISABLED)
FCR BIT-0 = 1 (FIFO ENABLED)
INT Pin
(I/M# = 1)
0 = one byte in THR
1 = THR empty
0 = FIFO above trigger level
1 = FIFO below trigger level or FIFO empty
IRQ# Pin
(I/M# = 0)
1 = one byte in THR
0 = THR empty
1 = FIFO above trigger level
0 = FIFO below trigger level or FIFO empty
TABLE 2: INT (IRQ#) PIN OPERATION FOR RECEIVER
FCR BIT-0 = 0
(FIFO DISABLED)
FCR BIT-0 = 1
(FIFO ENABLED)
INT Pin
(I/M# = 1)
0 = no data
1 = 1 byte
0 = FIFO below trigger level
1 = FIFO above trigger level
IRQ# Pin
(I/M# = 0)
1 = no data
0 = 1 byte
1 = FIFO below trigger level
0 = FIFO above trigger level
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XR19L402IL48-0B-EB 功能描述:界面開(kāi)發(fā)工具 Supports L402 48 pin QFN, PCI Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V
XR19L402IL48-F 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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