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參數(shù)資料
| 型號： | ST16C1450 |
| 廠商： | Exar Corporation |
| 英文描述： | 2.97V TO 5.5V UART |
| 中文描述： | 2.97V至5.5V的UART |
| 文件頁數(shù)： | 8/32頁 |
| 文件大?。?/td> | 355K |
| 代理商： | ST16C1450 |
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ST16C1450/51
2.97V TO 5.5V UART
á
REV. 4.2.0
8
2.2
The 145X includes an on-chip oscillator (XTAL1 and XTAL2). The crystal oscillator provides the system clock to
the Baud Rate Generators (BRG) in the UART. XTAL1 is the input to the oscillator or external clock buffer input
with XTAL2 pin being the output. For programming details, see
“Section 2.3, Programmable Baud Rate
Generator” on page 8
.
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
). Alternatively, an external
clock can be connected to the XTAL1 pin to clock the internal baud rate generator for standard or custom rates.
Typical oscillator connections are shown in
Figure 4
. For further reading on oscillator circuit please see
application note DAN108 on EXAR’s web site.
Crystal Oscillator or External Clock
2.3
The UART has its own Baud Rate Generator (BRG). The BRG divides the input crystal or external clock by a
programmable divisor between 1 and (2
16
-1) to obtain a 16X sampling clock of the serial data rate. The
sampling clock is used by the transmitter for data bit shifting and
receiver for data sampling. The BRG divisor
(DLL and DLM registers) defaults to a random value upon power up or a reset. Therefore, the BRG must be
programmed during initialization to the operating data rate. Programming the Baud Rate Generator Registers
DLM and DLL provides the capability of selecting the operating data rate.
Table 1
shows the standard data
rates available with a 14.7456 MHz crystal or external clock at 16X clock 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.
Programmable Baud Rate Generator
F
IGURE
4. T
YPICAL
OSCILLATOR
CONNECTIONS
divisor (decimal) = (XTAL1 clock frequency) / (serial data rate x 16)
C1
22-47pF
C2
22-47pF
Y1
1.8432 MHz
to
24 MHz
R1
0-120
(Optional)
R2
500K - 1M
XTAL1
XTAL2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST16C1450_05 | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.97V TO 5.5V UART |
| ST16C1450CJ28 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| ST16C1450CJ28-F | 功能描述:IC UART FIFO 1B 28PLCC RoHS:是 類別:集成電路 (IC) >> 接口 - UART（通用異步接收器/發(fā)送器） 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 特點(diǎn):* 通道數(shù):2，DUART FIFO's:16 字節(jié) 規(guī)程:RS232，RS485 電源電壓:2.25 V ~ 5.5 V 帶并行端口:- 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(diào)制解調(diào)器控制功能:是 帶CMOS:是 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:托盤 其它名稱:XR16L2551IM-F-ND |
| ST16C1450CJ28TR-F | 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)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 |
| ST16C1450CP28 | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.97V TO 5.5V UART |
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