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参数资料
| 型号： | MAX3109ETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/66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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Dual Serial UART with 128-Word FIFOs
MAX3109
25
Maxim Integrated
levels in the FlowLvl register. With differing HALT and
RESUME levels, hysteresis of the RxFIFO level can be
defined for RTS_ transitions.
When the RxFIFO is filled to a level higher than the HALT
level, the MAX3109 deasserts RTS_ and stops the far-
end UART from transmitting any additional data. RTS_
remains deasserted until the RxFIFO is emptied enough
so that the number of words falls to below the RESUME
level.
Interrupts are not generated when the HALT and
RESUME levels are reached. This allows the host con-
troller to be completely disengaged from RTS_ flow
control management.
AutoCTS Control
When AutoCTS flow control is enabled, the UART auto-
matically starts transmitting data when the CTS_ input
is logic-low and stops transmitting data when CTS_ is
logic-high. This frees the host processor from managing
this time-critical flow-control task. AutoCTS flow con-
trol is enabled by setting the FlowCtrl[1]: AutoCTS bit
high. The ISR[7]: CTSInt interrupt works normally during
AutoCTS flow control. Set the IRQEn[7]: CTSIntEn bit low
to disable routing of CTS_ interrupts to IRQ and ensure
that the host does not receive interrupts from CTS_
transitions. If CTS_ transitions from low to high during
transmission of a data word, the MAX3109 completes the
transmission of the current word and halts transmission
afterwards.
Turn the transmitter off by setting the MODE1[1]: TxDisabl
bit high before enabling AutoCTS control.
Auto Software (XON/XOFF) Flow Control
When auto software flow control is enabled, the MAX3109
recognizes and/or sends predefined XON/XOFF charac-
ters to control the flow of data across the asynchronous
serial link. The XON character signifies that there is
enough room in the receive FIFO and transmission of
data should continue. The XOFF character signifies that
the receive FIFO is nearing overflow and that the trans-
mission of data should stop. Auto software flow control
works autonomously and does not require host interven-
tion, similar to auto hardware flow control. To reduce the
chance of receiving corrupted data that equals a single-
byte XON or XOFF character, the MAX3109 allows for
double-wide (16-bit) XON/XOFF characters. The XON
and XOFF characters are programmed into the XON1,
XON2 and XOFF1, XOFF2 registers.
The FlowCtrl[7:3] bits are used for enabling and config-
uring auto software flow control. An interrupt is generated
in ISR[1]: SpCharInt whenever an XON or XOFF charac-
ter is received and details are stored in the SpclCharInt
register. Set the IRQEn[1]: SpclChrIEn bit low to disable
routing of the interrupt to IRQ.
Software flow control consists of transmit flow control
and receive flow control, which operate independently
of each other.
Receiver Flow Control
When auto receive flow control is enabled by the
FlowCtrl[7:6] bits, the MAX3109 automatically controls
the transmission of data by the far-end UART by send-
ing XOFF and XON control characters. The HALT and
RESUME levels determine the threshold RxFIFO fill levels
Figure 15. Echo Suppression Timing
TX_
RX_
DI TO RO PROPAGATION DELAY
HOLD DELAY
STOP
BIT
RTS_
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX310C/D | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX310CPE | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX310CPE+ | 功能描述:多路器开关 IC 8:1 Unbuffered RF Video MUX RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX310CWN | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX310CWN+ | 功能描述:多路器开关 IC 8:1 Unbuffered RF Video MUX RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
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