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AK8975 参数 Datasheet PDF下载

AK8975图片预览
型号: AK8975
PDF下载: 下载PDF文件 查看货源
内容描述: 3轴电子罗盘 [3-axis Electronic Compass]
分类和应用: 电子
文件页数/大小: 34 页 / 634 K
品牌: AKM [ ASAHI KASEI MICROSYSTEMS ]
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[AK8975/C]  
7.2. I2C Bus Interface  
The I2C bus interface of AK8975/C supports the standard mode (100 kHz max.) and the fast mode (400 kHz  
max.).  
7.2.1. Data Transfer  
To access AK8975/C on the bus, generate a start condition first.  
Next, transmit a one-byte slave address including a device address. At this time, AK8975/C compares the slave  
address with its own address. If these addresses match, AK8975/C generates an acknowledgement, and then  
executes READ or WRITE instruction. At the end of instruction execution, generate a stop condition.  
7.2.1.1. Change of Data  
A change of data on the SDA line must be made during "Low" period of the clock on the SCL line. When the  
clock signal on the SCL line is "High", the state of the SDA line must be stable. (Data on the SDA line can be  
changed only when the clock signal on the SCL line is "Low".)  
During the SCL line is "High", the state of data on the SDA line is changed only when a start condition or a  
stop condition is generated.  
SCL  
SDA  
DATA LINE  
STABLE :  
DATA VALID  
CHANGE  
OF DATA  
ALLOWED  
Figure 7.3 Data Change  
7.2.1.2. Start/Stop Condition  
If the SDA line is driven to "Low" from "High" when the SCL line is "High", a start condition is generated.  
Any instruction starts with a start condition.  
If the SDA line is driven to "High" from "Low" when the SCL line is "High", a stop condition is generated.  
Any instruction stops with a stop condition.  
SCL  
SDA  
START CONDITION  
STOP CONDITION  
Figure 7.4 Start and Stop Conditions  
MS1187-E-02  
- 18 -  
2010/05  
 
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