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| 型號(hào)： | MAX3109ETJ+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 17/66頁(yè) |
| 文件大小： | 0K |
| 描述： | SEMICONDUCTOR OTHER |
| 標(biāo)準(zhǔn)包裝： | 60 |
| 系列： | * |
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Dual Serial UART with 128-Word FIFOs
MAX3109
24
Maxim Integrated
Figure 14. Half-Duplex with Echo Suppression
trigger accuracy equation for a single transmitter output.
Calculate the TX_ transmitter output skew using the fol-
lowing equation:
TRIGSKEW
SF
65
t
(UARTCLK)
≤
where (UARTCLK)S is the fractional divider output clock
of the lower/slower baud rate UART, and (UARTCLK)F
is the fractional divider output clock of the higher/faster
baud rate UART.
Auto Transmitter Disable
The MAX3109 allows automatic disabling of the trans-
mitter. Enable auto transmitter disabling functionality by
setting the TxSynch[6]: TxAutoDis bit high. In this mode,
the MAX3109 disables the specified transmitter by set-
ting the MODE1[1]: TxDisabl bit high after it completes
sending all the data in its TxFIFO. New data can then be
loaded into the TxFIFO. A disabled transmitter does not
send out data on the TX_ output when data is present in
its TxFIFO.
To enable transmission after a transmitter has been dis-
abled automatically, either clear the TxAutoDis or toggle
the TxDisabl bit.
Echo Suppression
The MAX3109 can suppress echoed data that is some-
times found in half-duplex communication networks,
such as RS-485 and IrDA. If the transceiver’s receiver is
not turned off while the transceiver is transmitting, cop-
ies (echoes) of the transmitted data are received by the
UART. The MAX3109’s receiver can block the recep-
tion of this echoed data by enabling echo suppression.
Figure 14 shows a typical RS-485 application using the
echo suppression feature. Set the MODE2[7]: EchoSuprs
bit high to enable echo suppression.
The MAX3109 can also block echoes with a long round
trip delay by disabling the transceiver’s receiver with
the RTS_ output while the MAX3109 is transmitting. The
transmitter can be configured to remain enabled after
the end of the transmission for a programmable period
of time called the hold time delay (Figure 15). The hold
time delay is set by the HDplxDelay[3:0]: Holdx bits.
See the HDplxDelay description in the Detailed Register
Descriptions section for more information.
Echo suppression can operate simultaneously with auto
transceiver direction control.
Auto Hardware Flow Control
The MAX3109 is capable of auto hardware (RTS_ and
CTS_) flow control without the need for host proces-
sor intervention. When AutoRTS control is enabled,
the MAX3109 automatically controls the RTS_ hand-
shake without the need for host processor intervention.
AutoCTS flow control separately turns the MAX3109’s
transmitter on and off based on the CTS_ input. AutoRTS
and AutoCTS flow control modes are independently
enabled by the FlowCtrl[1:0] bits.
AutoRTS Control
AutoRTS flow control ensures that the receive FIFO does
not overflow by signaling to the far-end UART to stop
data transmission. The MAX3109 does this automatically
by controlling the RTS_ output. AutoRTS flow control is
enabled by setting the FlowCtrl[0]: AutoRTS bit high.
The HALT and RESUME programmable values deter-
mine the threshold RxFIFO fill levels at which RTS_ is
asserted and deasserted. Set the HALT and RESUME
MAX3109
MAX14840E
TRANSMITTER
TX_
B
A
D
RX_
TxFIFO
RECEIVER
ECHO
SUPPRESSION
RxFIFO
DI
RO
RE
DE
R
RTS_
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| MAX3109ETJ+ | 功能描述:UART 接口集成電路 Dual Serial UART with 128-Word FIFOs 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 |
| MAX3109ETJ+T | 功能描述:UART 接口集成電路 Dual Serial UART with 128-Word FIFOs 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 |
| MAX310C/D | 功能描述:多路器開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開(kāi)關(guān)數(shù)量:4 開(kāi)啟電阻（最大值）:7 Ohms 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MAX310CPE | 功能描述:多路器開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開(kāi)關(guān)數(shù)量:4 開(kāi)啟電阻（最大值）:7 Ohms 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MAX310CPE+ | 功能描述:多路器開(kāi)關(guān) IC 8:1 Unbuffered RF Video MUX RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開(kāi)關(guān)數(shù)量:4 開(kāi)啟電阻（最大值）:7 Ohms 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
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