REV. 1.1.0 2.0 FUNCTIONAL DESCRIPTIONS 2.1 CPU Interface The M1170 ca" />
參數(shù)資料
型號(hào)： XR20M1170IL28-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 53/56頁(yè)
文件大?。?/td> 0K
描述： IC UART FIFO I2C/SPI 64B 28QFN
產(chǎn)品變化通告： XR(16L580IL28, XR20M1170IL28)(TR)-F Obsolescence 2/May/2011
標(biāo)準(zhǔn)包裝： 490
特點(diǎn)： *
通道數(shù)： 1，UART
FIFO's： 64 字節(jié)
規(guī)程： RS485
電源電壓： 2.25 V ~ 3.6 V
帶自動(dòng)流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動(dòng)位檢測(cè)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： 28-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 28-QFN 裸露焊盤（5x5）
包裝： 托盤
XR20M1170
6
I2C/SPI UART WITH 64-BYTE FIFO
REV. 1.1.0
2.0 FUNCTIONAL DESCRIPTIONS
2.1
CPU Interface
The M1170 can operate with either an I2C-bus interface or an SPI interface. The CPU interface is selected via
the I2C/SPI# input pin.
2.1.1
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 M1170 responds to each write with an
acknowledge (SDA driven LOW by M1170 for one clock cycle when SCL is HIGH). If the TX FIFO is full, the
M1170 will respond with a negative acknowledge (SDA driven HIGH by M1170 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 (M1170)
SW
A
AP
SLAVE
ADDRESS
REGISTER
ADDRESS
nDATA
White block: host to UART
Grey block: UART to host
FIGURE 5. MASTER READS FROM SLAVE (M1170)
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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參數(shù)描述
XR20M1170L16-0A-EB 功能描述:UART 接口集成電路 Supports M1170 16pin QFN, I2C Interface 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
XR20M1170L16-0B-EB 功能描述:UART 接口集成電路 Supports M1170 16pin QFN, SPI Interface 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
XR20M1170L24-0A-EB 功能描述:UART 接口集成電路 Supports M1170 24pin QFN, I2C Interface 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
XR20M1170L24-0B-EB 功能描述:UART 接口集成電路 Supports M1170 28pin QFN, SPI Interface 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
XR20M1170L28-0A-EB 功能描述:UART 接口集成電路 Supports M1170 28pin QFN, I2C Interface 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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