參數(shù)資料
型號(hào)： MAX3140EEI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 微控制器/微處理器
英文描述： CABLE ASSEMBLY; LEAD-FREE SOLDER; SMA MALE TO SMC PLUG; 50 OHM, RG400/U COAX, DOUBLE SHIELDED
中文描述： 1 CHANNEL(S), 240K bps, SERIAL COMM CONTROLLER, PDSO28
封裝： 0.150 INCH, 0.025 INCH PITCH, QSOP-28
文件頁(yè)數(shù)： 26/36頁(yè)
文件大?。?/td> 468K
代理商： MAX3140EEI
M
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
26
______________________________________________________________________________________
S
S
S
S
NORMAL
RX
UART FRAME
DATA BITS
0
1
1
1
1
1
0
0
0
0
NORMAL UART
TX
1
1
1
1
1
0
0
0
0
IrDA
RX
IrDA
TX
Figure 16. IrDA Timing
100kHz/div
0
1MHz
20dB/div
M
Figure 17. Driver Output Waveform and FFT Plot of MAX3140
with SRL = GND, Transmitting at 20kHz
9-Bit Networks
The MAX3140 supports a common multidrop communi-
cation technique referred to as 9-bit mode. In this
mode, the parity bit is set to indicate a message that
contains a header with a destination address. Set the
MAX3140’s parity mask to generate interrupts for this
condition. Operating a network in this mode reduces
the processing overhead of all nodes by enabling the
slave controllers to ignore most message traffic. This
relieves the remote processor to handle more useful
tasks.
In 9-bit mode, the MAX3140 is set up with eight bits
plus parity. The parity bit in all normal messages is
clear, but is set in an address-type message. The
MAX3140’s parity-interrupt mask generates an interrupt
on high parity when enabled. When the master sends
an address message with the parity bit set, all
MAX3140 nodes issue an interrupt. All nodes then
retrieve the received byte to compare to their assigned
address. Once addressed, the node continues to
process each received byte. If the node was not
addressed, it ignores all message traffic until a new
address is sent out by the master.
The parity/9th-bit interrupt is controlled only by the data
in the receive register and is not affected by data in the
FIFO, so the most effective use of the parity/9th-bit
interrupt is with FIFO disabled. With the FIFO disabled,
received nonaddress words are ignored and not even
read from the UART.
S IR IrDA Mode
The MAX3140’s IrDA mode communicates with other
IrDA SIR-compatible devices, or reduces power con-
sumption in opto-isolated applications.
In IrDA mode, a bit period is shortened to 3/16 of a
baud period (1.61μs at 115,200 baud) (Figure 16). A
data zero is transmitted as a pulse of light (TX = logic
low, RX = logic high).
In receive mode, the RX signal’s sampling is done
halfway into the transmission of a high level. The sam-
pling is done once, instead of three times, as in normal
mode. The MAX3140 ignores pulses shorter than
approximately 1/16 of the baud period. The IrDA device
that is communicating with the MAX3140 must transmit
pulses at 3/16 of the baud period. For compatibility with
other IrDA devices, set the format to 8-bit data, one
stop, no parity.
256 RS -485 T ransc eivers on the Bus
The standard RS-485 receiver input impedance is 12k
(one unit load), and the standard driver can drive up to
32 unit loads. The MAX3140 has a 1/8-unit-load receiver
input impedance (96k
), allowing up to 256 trans-
ceivers to be connected in parallel on one communica-
tion line. Any combination of these devices and/or other
RS-485 transceivers with a total of 32 unit loads or less
can be connected to the line.
Reduc ed EMI and Reflec tions for the
RS -485/RS -422 Driver
The MAX3140 with SRL = V
CC
or unconnected, is slew-
rate limited, minimizing EMI and reducing reflections
caused by improperly terminated cables. Figure 17
shows the driver output waveform and its Fourier analy-
相關(guān)PDF資料
PDF描述
MAX3140 SPI/MICROWIRE-Compatible UART with Integrated True Fail-Safe RS-485/RS-422 Transceivers
MAX3140CEI 4x4 1.5 Gbps LVDS Crosspoint Switch 38-TSSOP -40 to 85
MAX314LCSE 10 з, Quad, SPST, +3V Logic-Compatible Analog Switches
MAX314LCUE 10 з, Quad, SPST, +3V Logic-Compatible Analog Switches
MAX314LEPE 10 з, Quad, SPST, +3V Logic-Compatible Analog Switches
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3140EEI+ 功能描述:UART 接口集成電路 SPI/uWire Compatible 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
MAX3140EEI+T 功能描述:UART 接口集成電路 SPI/uWire Compatible 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
MAX3140EEI-T 功能描述:UART 接口集成電路 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
MAX3147NC SPL 制造商:Toshiba America Electronic Components 功能描述:NORTEL HDD - Bulk
MAX314C/D 功能描述:模擬開關(guān) IC 10Ohm Quad SPST CMOS Analog Switches RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:2 開關(guān)配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*