REV. 1.0.0 I2C/SPI UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS 1.0 FUNCTIONAL DESCRIPTIONS 1.1 CPU Interface
參數(shù)資料
型號： XR20M1280IL24-F
廠商： Exar Corporation
文件頁數(shù)： 61/63頁
文件大?。?/td> 0K
描述： IC UART I2C/SPI 128 BYTE 24QFN
產(chǎn)品培訓(xùn)模塊： UART Product Overview
XR21V141x Full-Speed USB UART Family
標(biāo)準(zhǔn)包裝： 490
通道數(shù)： 1，UART
FIFO's： 128 字節(jié)
規(guī)程： RS485
電源電壓： 1.62 V ~ 3.63 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(diào)制解調(diào)器控制功能： 是
安裝類型： 表面貼裝
封裝/外殼： 24-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 24-QFN 裸露焊盤（4x4）
包裝： 托盤
其它名稱： 1016-1379
XR20M1280
7
REV. 1.0.0
I2C/SPI UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
1.0 FUNCTIONAL DESCRIPTIONS
1.1
CPU Interface
The XR20M1280 can operate with either an I2C-bus interface or an SPI interface. The CPU interface is
selected via the I2C/SPI# input pin.
1.1.1
I2C-bus Interface
The I2C-bus interface is compliant with the Standard-mode and Fast-mode I2C-bus specifications. The I2C-bus
interface consists of two lines: serial data (SDA) and serial clock (SCL). In the Standard-mode, the serial clock
and serial data can go up to 100 kbps and in the Fast-mode, the serial clock and serial data can go up to 400
kbps. The first byte sent by an I2C-bus master contains a start bit (SDA transition from HIGH to LOW when
SCL is HIGH), 7-bit slave address and whether it is a read or write transaction. The next byte is the sub-
address that contains the address of the register to access. The XR20M1280 responds to each write with an
acknowledge (SDA driven LOW by XR20M1280 for one clock cycle when SCL is HIGH). If the TX FIFO is full,
the XR20M1280 will respond with a negative acknowledge (SDA driven HIGH by XR20M1280 for one clock
cycle when SCL is HIGH) when the CPU tries to write to the TX FIFO. The last byte sent by an I2C-bus master
contains a stop bit (SDA transition from LOW to HIGH when SCL is HIGH). See Figures 3 - 5 below. For
complete details, see the I2C-bus specifications.
FIGURE 3. I C START AND STOP CONDITIONS
SDA
SCL
S
P
START condition
STOP condition
FIGURE 4. MASTER WRITES TO SLAVE (XR20M1280)
SW
A
AP
SLAVE
ADDRESS
REGISTER
ADDRESS
nDATA
White block: host to UART
Grey block: UART to host
FIGURE 5. MASTER READS FROM SLAVE (XR20M1280)
SW
A
AR
SLAVE
ADDRESS
REGISTER
ADDRESS
White block: host to UART
Grey block: UART to host
A
S
SLAVE
ADDRESS
nDATA
ANA
P
LAST DATA
2
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XR20M1280IL32-F 功能描述:UART 接口集成電路 1Ch 12C/SPI UART w/ Lvl Shftrs & 8 GPIOs 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
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