SPI/I2C UART with 128-Word FIFOs DIV can be a maximum of 16 bits wide and is pro" />
參數(shù)資料
型號： MAX3107EVKIT+
廠商： Maxim Integrated Products
文件頁數(shù)： 10/52頁
文件大?。?/td> 0K
描述： EVAL KIT I2C/SPI UART MAX3107
產品培訓模塊： Obsolescence Mitigation Program
標準包裝： 1
主要目的： 接口，UART
已用 IC / 零件： MAX3107
主要屬性： 圖形用戶界面（GUI）
次要屬性： I²C & SPI 接口
已供物品： 板，線纜
SPI/I2C UART with 128-Word FIFOs
DIV can be a maximum of 16 bits wide and is pro-
grammed into the 2-byte-wide registers DIVMSB and
DIVLSB. The minimum allowed for DIVLSB is 1.
The fractional portion of the divisor, FRACT, is a 4-bit
nibble, which is programmed into BRGConfig[3:0]. The
maximum value is 15, allowing the divisor to be pro-
grammed with a resolution of 0.0625. FRACT is calcu-
lated as:
FRACT = ROUND(16 x (D-DIV))
The following is an example of calculating the divisor.
It is based on a required baud rate of 190kbaud and a
reference input frequency of 28.23MHz and 1x (default)
rate mode.
The ideal divisor is calculated as:
D = 28,230,000/(16 x 190,000)
= 9.2861842105263157894736842105263
hence DIV = 9.
FRACT =
ROUND(4.5789473684210526315789473684211) = 5
so that DIVMSB = 0x00, DIVLSB = 0x09, and
BRGConfig[3:0] = 0x05.
The resulting (actual) baud rate can be calculated as:
REF
ACTUAL
f
BR
16 D
=
×
For this example: DACTUAL = 9 + 5/16 = 9.3125
where
DACTUAL = DIV + FRACT/16
and
BRACTUAL= 28,230,000/(16 x 9.3125)
= 189463.0872483221476510067114094 baud
Thus, the baud rate is within 0.28% of the ideal rate.
2x and 4x Rate Modes
To support higher baud rates than possible with stan-
dard (16x sampling) operation, the MAX3107 offers 2x
and 4x rate modes. In this case, the reference clock rate
only needs to be either 8x or 4x of the baud rate, respec-
tively. The bits are only sampled once at the midbit
instant instead of the usual three samples to determine
the logic value of the bits. This reduces the tolerance to
line noise on the received data. The 2x and 4x modes
are selectable through BRGConfig[5:4]. Note that IrDA
encoding and decoding does not operate in 2x and 4x
modes.
When 2x rate mode is selected, the actual baud rate is
twice the rate programmed into the baud-rate genera-
tor. If 4x rate mode is enabled, the actual baud rate on
the line is quadruple that of programmed baud rate
(Figure 8).
Figure 8. 2x and 4x Baud Rates
FRACTIONAL
RATE
GENERATOR
fREF
BAUD RATE
BaudRateConfig[5:4]
DIV[LSB]
DIV[MSB]
NOTE: IrDA DOES NOT WORK IN 2x AND 4x MODES.
FRACT
1x, 2x, 4x RATE
MODES
18
Maxim Integrated
MAX3107
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參數(shù)描述
MAX3107EVKIT+ 功能描述:UART 接口集成電路 UART with integrated Oscillator 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
MAX3108AEWA+ 制造商:Maxim Integrated Products 功能描述:LOW SHUTDOWN CURRENT SPI/I?C UART WITH 128-WORD FIFOS IN WLP - Rail/Tube
MAX3108AEWA+T 功能描述:UART 接口集成電路 SPI/I2C UART W/ 128 WORD FIFO 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
MAX3108EWA+ 制造商:Maxim Integrated Products 功能描述:SPI/IAC UART WITH 128-WORD FIFOS IN WLP - Rail/Tube
MAX3108EWA+T 功能描述:IC UART 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:* 標準包裝:250 系列:- 特點:* 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 帶調制解調器控制功能:是 帶CMOS:是 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:托盤 其它名稱:XR16L2551IM-F-ND
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