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参数资料
| 型号： | MAX14830ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/68页 |
| 文件大小： | 0K |
| 描述： | IC UART |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | * |
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24
Maxim Integrated
Quad Serial UART with 128-Word FIFOs
MAX14830
Trigger Accuracy
The delay between the time when the MAX14830
receives a trigger command and the time when the
associated transmitter starts transmission is made up
of a fixed, deterministic portion and a variable, random
component. Both portions of the delay are dependent on
the UART’s clock and baud rates. When the fractional
divider is not used, the intrinsic trigger delay, tTRIG, is
bounded by the following limits:
TRIG
5 BR
6 BR
t
16
×
≤
where BR is the fractional divider output clock period.
This equation is independent on the rate mode. The
reference point is the time when the trigger command is
received by the MAX14830. This occurs on the final (i.e.
the 16th) SPI clock’s low-to-high transition (Figure 12).
When the fractional baud-rate generator is used, the
random portion is larger than one UART clock period.
Synchronization Accuracy
When synchronizing multiple UART transmitters, the
accuracy of the TX_ transmitter outputs is based on the
triggering delays of each UART (Figure 13). This skew
has a baud-rate dependent component, similar to the
trigger accuracy equation for a single transmitter output.
Calculate the TX_ transmitter output skew using the fol-
lowing equation:
(
)
SF
TRIGSKEW
6 BR
5 BR
t
max
16
×
≤
where BRS is the fractional divider output clock of the
lower/slower baud-rate UART and BRF is the fractional
divider output clock of the higher/faster baud-rate UART.
Auto Transmitter Disable
The MAX14830 allows automatic disabling of the trans-
mitter. Enable auto transmitter disabling functionality by
setting TxSynch[4] to 1. When auto transmitter disabling
is activated, the MAX14830 disables the specified
transmitter 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, either clear the TxAutoDis bit
in the TxSynch register or toggle the TxDisabl bit in the
MODE1 register.
Echo Suppression
The MAX14830 can suppress echoed data, sometimes
found in half-duplex communication (e.g. RS-485 and
IrDA). If the transceiver’s receiver is not turned off while
the transceiver is transmitting, copies (echoes) are
received by the UART. The MAX14830’s receiver can
block the reception of this echoed data by enabling echo
suppression. Set MODE2[7]: EchoSuprs to 1 to enable
echo suppression.
The MAX14830 receiver can block echoes with a long
round trip delay. The transmitter can be configured to
remain enabled after the end of transmission for a pro-
grammable period of time: the hold time delay (Figure
14). The hold time delay is set by the HDplxDelay[3:0]
register. See the HDplxDelay Register section for more
information.
Figure 12. Single Transmitter Trigger Accuracy
UNCERTAINTY
INTERVAL
tTRIG_MIN
tTRIG_MAX
TX_
SCLK
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX14830EVKIT# | 功能描述:界面开发工具 MAX14830 Eval Kit RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| MAX14830EVKIT+ | 制造商:Maxim Integrated Products 功能描述:QUAD UART EV-KIT WITH IO-LINK AND MULTIPROTOCOL - Boxed Product (Development Kits) |
| MAX1483C/D+ | 功能描述:RS-485接口IC low-power transceivers for RS-485 and RS-422 communication RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1483CPA | 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1483CPA+ | 功能描述:RS-422/RS-485 接口 IC Slew-Rate-Limited RS-485 Transceivers RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
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