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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]  
6.4. Description of Each Operation Mode  
6.4.1. Power-down Mode  
Power to all internal circuits is turned off. All registers except fuse ROM are accessible in power-down mode.  
Data stored in read/write registers are remained.  
6.4.2. Single Measurement Mode  
When single measurement mode (MODE[3:0]=“0001”) is set, sensor is measured, and after sensor  
measurement and signal processing is finished, measurement data is stored to measurement data registers  
(HXL to HZH), then AK8975/C transits to power-down mode automatically. On transition to power-down  
mode, MODE[3:0] turns to “0000”. At the same time, DRDY bit in ST1 register turns to “1”. This is called  
“Data Ready”. When any of measurement data register (HXL to HZH) or ST2 register is read, or operation  
mode is changed from power-down mode to other mode, DRDY bit turns to “0”. DRDY pin is in the same state  
as DRDY bit.  
Operation Mode:  
Power-down  
Single measuremnet  
(1)  
(2)  
(3)  
Measurement period  
Measurement Data Register  
Last Data  
IndefiniteMeasurement Data (1) IndefiniteData(2)  
IndefiniteData(3)  
DRDY  
Register Read  
Register Write  
Data Register  
Data Register  
MODE[3:0]="0001"  
MODE[3:0]="0001" MODE[3:0]="0001"  
Figure 6.2 Single measurement mode  
6.4.2.1. Data Ready  
When measurement data is stored and ready to be read, DRDY bit in ST1 register turns to “1”. This is called  
“Data Ready”. DRDY pin is in the same state as DRDY bit. When measurement is performed correctly,  
AK8975/C becomes Data Ready on transition to Power-down mode (PD) after measurement. The period from  
the end of Nth measurement to the start of (N+1)th measurement is called “Data Readable Period”. Stored  
measurement data should be read during Data Readable Period.  
(N-1)th  
PD  
Nth  
Measurement  
(N+1)th  
Measurement  
PD  
PD  
Data Readable Period  
Data Readable Period  
Figure 6.3 Data Readable Period  
MS1187-E-02  
- 13 -  
2010/05  
 
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