REV. 1.1.0 2.1.1.1 I2C-bus Addressing" />
參數(shù)資料
型號(hào)： XR20M1170L16-0B-EB
廠商： Exar Corporation
文件頁(yè)數(shù)： 55/56頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR20M1170 16QFN
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，UART
嵌入式： 否
已用 IC / 零件： XR20M1170
次要屬性： I²C & SPI 接口
已供物品： 板
其它名稱： 1016-1619
XR20M1170L16-0B-EB-ND
XR20M1170
8
I2C/SPI UART WITH 64-BYTE FIFO
REV. 1.1.0
2.1.1.1
I2C-bus Addressing
There could be many devices on the I2C-bus. To distinguish itself from the other devices on the I2C-bus, there
are eight possible slave addresses that can be selected for the M1170 using the A1 and A0 address lines.
Table 1 below shows the different addresses that can be selected. Note that there are two different ways to
select each I2C address.
TABLE 1: XR20M1170 I C ADDRESS MAP
C ADDRESS
VCC
0x60 (0110 000X)
VCC
GND
0x62 (0110 001X)
VCC
SCL
0x64 (0110 010X)
VCC
SDA
0x66 (0110 011X)
GND
VCC
0x68 (0110 100X)
GND
0x6A (0110 101X)
GND
SCL
0x6C (0110 110X)
GND
SDA
0x6E (0110 111X)
SCL
VCC
0x60 (0110 000X)
SCL
GND
0x62 (0110 001X)
SCL
0x64 (0110 010X)
SCL
SDA
0x66 (0110 011X)
SDA
VCC
0x68 (0110 100X)
SDA
GND
0x6A (0110 101X)
SDA
SCL
0x6C (0110 110X)
SDA
0x6E (0110 111X)
An I2C sub-address is sent by the I2C master following the slave address. The sub-address contains the
UART register address being accessed. A read or write transaction is determined by bit-0 of the slave
address. If bit-0 is’0’, then it is a write transaction. If bit-0 is ’1’, then it is a read transaction. If bit-0 is a logic
1, then it is a read transaction. Table 2 below lists the functions of the bits in the I2C sub-address.
TABLE 2: I C SUB-ADDRESS (REGISTER ADDRESS)
BIT
FUNCTION
7
Reserved
6:3
UART Internal Register Address A3:A0
2:1
UART Channel Select
’00’ = UART Channel A, other values are reserved
0
Reserved
After the last read or write transaction, the I2C-bus master will set the SCL signal back to its idle state (HIGH).
2
A1
A0
I2
2
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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
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