REV. 1.2.1 10 The on-chip oscillator is designed to use an industry standard microprocessor " />
參數資料
型號： XR16L2752IJ-F
廠商： Exar Corporation
文件頁數： 2/49頁
文件大小： 0K
描述： IC UART FIFO 64B DUAL 44PLCC
標準包裝： 27
特點： *
通道數： 2，DUART
FIFO's： 64 字節(jié)
規(guī)程： RS232，RS485
電源電壓： 2.25 V ~ 5.5 V
帶自動流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動位檢測功能： 是
帶調制解調器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 44-LCC（J 形引線）
供應商設備封裝： 44-PLCC（16.59x16.59）
包裝： 管件
其它名稱： 1016-1650
XR16L2752IJ-F-ND
XR16L2752
xr
2.25V TO 5.5V DUART WITH 64-BYTE FIFO
REV. 1.2.1
10
The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant,
fundamental frequency with 10-22 pF capacitance load, ESR of 20-120 ohms and 100ppm frequency
tolerance) connected externally between the XTAL1 and XTAL2 pins (see Figure 4). The programmable Baud
Rate Generator is capable of operating with a crystal oscillator 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 (6.25 Mbps serial data rate) and 5V with an 8X sampling rate.
For further reading on the oscillator circuit please see the Application Note DAN108 on the EXAR web site at
2.11
Programmable Baud Rate Generator
Each UART has its own Baud Rate Generator (BRG) with a prescaler. The prescaler is controlled by 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. 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. The BRG
divisor defaults to the maximum baud rate (DLL = 0x01 and DLM = 0x00) upon power up.
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 (EMSR bit-7=0) 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 5. EXTERNAL CLOCK CONNECTION FOR EXTENDED DATA RATE
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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相關代理商/技術參數
參數描述
XR16L2752IJTR-F 制造商:Exar Corporation 功能描述:XR16L2752 Series 6.25 Mbps 5.5 V Dual UART With 64-Byte FIFO - PLCC-44
XR16L570 制造商:EXAR 制造商全稱:EXAR 功能描述:SMALLEST 1.62V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
XR16L570_07 制造商:EXAR 制造商全稱:EXAR 功能描述:SMALLEST 1.62V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
XR16L570IL24 功能描述:UART 接口集成電路 UART w/ POWER SAVE RoHS:否 制造商:Texas Instruments 通道數量:2 數據速率: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
XR16L570IL24-0B-EB 功能描述:UART 接口集成電路 Supports L570 24 pin QFN, PCI Interface RoHS:否 制造商:Texas Instruments 通道數量:2 數據速率: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
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