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参数资料
| 型号： | XR16C2850CJTR-F |
| 厂商： | Exar Corporation |
| 文件页数： | 3/51页 |
| 文件大小： | 0K |
| 描述： | IC UART FIFO 128B 44PLCC |
| 标准包装： | 500 |
| 特点： | * |
| 通道数： | 2，DUART |
| FIFO's： | 128 字节 |
| 规程： | RS232，RS485 |
| 电源电压： | 2.97 V ~ 5.5 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： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-PLCC（16.59x16.59） |
| 包装： | 带卷 (TR) |
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xr
XR16C2850
REV. 2.1.3
2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS
11
Typical oscillator connections are shown in Figure 4. For further reading on oscillator circuit please see
application note DAN108 on EXAR’s web site.
2.9
Programmable Baud Rate Generator
A single Baud Rate Generator (BRG) is provided for the transmitter and receiver, allowing independent TX/RX
channel control. The programmable Baud Rate Generator is capable of operating with a crystal frequency of
up to 24 MHz. However, with an external clock input on XTAL1 pin and a 2K ohms pull-up resistor on XTAL2
pin (as shown in Figure 5) it can extend its operation up to 50 MHz (3.125 Mbps serial data rate and 16X
sampling) at room temperature and 5.0V.
FIGURE 5. EXTERNAL CLOCK CONNECTION FOR EXTENDED DATA RATE
Each UART also has their own prescaler along with the BRG. The prescaler is controlled by CLKSEL hardware
pin or a software bit in the MCR register. The MCR register bit-7 sets the prescaler to divide the input crystal or
external clock by 1 or 4 and can override the CLKSEL pin following reset. The clock output of the prescaler
goes to the BRG. The BRG further divides this clock by a programmable divisor between 1 and (216 -1) to
obtain a 16X sampling rate clock of the serial data rate. The sampling rate clock is used by the transmitter for
data bit shifting and receiver for data sampling.
Programming the Baud Rate Generator Registers DLM and DLL provides the capability of selecting the
operating data rate. Table 5 shows the standard data rates available with a 14.7456 MHz crystal or external
clock at 16X sampling rate clock rate. A 16X sampling clock is typically used. However, user can select the 8X
sampling clock rate mode to double the operating data rate. When using a non-standard data rate crystal or
external clock, the divisor value can be calculated for DLL/DLM with the following equation.
FIGURE 6. BAUD RATE GENERATOR AND PRESCALER
2K
XTAL1
XTAL2
R1
VCC
External Clock
vcc
gnd
XTAL1
XTAL2
Crystal
Osc/
Buffer
MCR Bit-7=0
(default)
MCR Bit-7=1
DLL and DLM
Registers
Prescaler
Divide by 1
Prescaler
Divide by 4
16X
Sampling
Rate Clock to
Transmitter
Baud Rate
Generator
Logic
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相关代理商/技术参数 |
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| XR16C2850CM | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| XR16C2850CM-0A-EB | 功能描述:UART 接口集成电路 Supports C2850 48 ld TQFP, ISA Interface 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 |
| XR16C2850CM-0B-EB | 功能描述:UART 接口集成电路 Supports C2850 48 ld TQFP, PCI Interface 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 |
| XR16C2850CM48 | 制造商:EXAR 制造商全称:EXAR 功能描述:3.3V AND 5V DUART WITH 128-BYTE FIFO |
| XR16C2850CM-F | 功能描述:UART 接口集成电路 2.97V-5.5V 128B FIFO temp 0C to 70C; 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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