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参数资料
| 型号： | XR20M1172IG28 |
| 厂商： | Exar Corporation |
| 文件页数： | 10/55页 |
| 文件大小： | 0K |
| 描述： | IC UART FIFO I2C/SPI 64B 28TSSOP |
| 产品变化通告： | Leaded UART, V&I Obsolescence 11/Apr/2011 |
| 标准包装： | 50 |
| 特点： | * |
| 通道数： | 2，DUART |
| FIFO's： | 64 字节 |
| 规程： | RS485 |
| 电源电压： | 1.62 V ~ 3.63 V |
| 带自动流量控制功能： | 是 |
| 带IrDA 编码器/解码器： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
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XR20M1172
18
TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO
REV. 1.2.0
2.9
Auto RTS (Hardware) Flow Control
Automatic RTS hardware flow control is used to prevent data overrun to the local receiver FIFO. The RTS#
output is used to request remote unit to suspend/resume data transmission. The auto RTS flow control
features is enabled to fit specific application requirement (see Figure 17):
Enable auto RTS flow control using EFR bit-6.
The auto RTS function must be started by asserting RTS# output pin (MCR bit-1 to logic 1 after it is enabled).
If using the Auto RTS interrupt:
Enable RTS interrupt through IER bit-6 (after setting EFR bit-4). The UART issues an interrupt when the
RTS# pin makes a transition from low to high: ISR bit-5 will be set to logic 1.
2.10
Auto RTS Halt and Resume
The RTS# pin will not be forced HIGH (RTS off) until the receive FIFO reaches the Halt Level (TCR[3:0]). The
RTS# pin will return LOW after the RX FIFO is unloaded to the Resume Level (TCR[7:4]). Under these
conditions, the M1172 will continue to accept data if the remote UART continues to transmit data. It is the
responsibility of the user to ensure that the Halt Level is greater than the Resume Level. If interrupts are used,
it is recommended that Halt Level > RX Trigger Level > Resume Level. The Auto RTS function is initiated
when the RTS# output pin is asserted LOW (RTS On).
2.11
Auto CTS Flow Control
Automatic CTS flow control is used to prevent data overrun to the remote receiver FIFO. The CTS# input is
monitored to suspend/restart the local transmitter. The auto CTS flow control feature is selected to fit specific
application requirement (see Figure 17):
Enable auto CTS flow control using EFR bit-7.
If using the Auto CTS interrupt:
Enable CTS interrupt through IER bit-7 (after setting EFR bit-4). The UART issues an interrupt when the
CTS# pin is de-asserted (HIGH): ISR bit-5 will be set to 1, and UART will suspend transmission as soon as
FIGURE 16. RECEIVER OPERATION IN FIFO AND AUTO RTS FLOW CONTROL MODE
Receive Data Shift
Register (RSR)
RXFIFO1
16X or 8X or 4X Clock
( DLD[5:4] )
E
rr
o
r
T
a
g
s
(6
4
-s
e
ts
)
E
rr
o
r
T
a
g
s
in
L
S
R
b
it
s
4
:2
Receive Data Characters
FIFO
Trigger=16
Example
: - RX FIFO trigger level selected at 16 bytes
(See Note Below)
Data fills to
Halt Level
Data falls to
Resume Level
Data Bit
Validation
Receive
Data FIFO
Receive
Data
Receive Data
Byte and Errors
RHR Interrupt (ISR bit-2) programmed for
desired FIFO trigger level.
FIFO is Enabled by FCR bit-0=1
RTS# de-asserts when data fills to the Halt Level
to suspend remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
RTS# re-asserts when data falls to the Resume
Level to restart remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
64 bytes by 11-bit wide
FIFO
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XR20M1172IG28-F | 功能描述:UART 接口集成电路 UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR20M1172IG28-F | 制造商:Exar Corporation 功能描述:IC DUAL UART 16MBPS 3.63V 28-TSSOP 制造商:Exar Corporation 功能描述:IC, DUAL UART, 16MBPS, 3.63V, 28-TSSOP |
| XR20M1172IG28TR-F | 功能描述:UART 接口集成电路 1.8V 2 Ch 64-byte I2C/SPI UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR20M1172IL32 | 制造商:EXAR 制造商全称:EXAR 功能描述:TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO |
| XR20M1172IL32-F | 功能描述:UART 接口集成电路 UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
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