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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]  
7.2.2. WRITE Instruction  
When the R/W bit is set to "0", AK8975/C performs write operation.  
In write operation, AK8975/C generates an acknowledge after receiving a start condition and the first byte  
(slave address) then receives the second byte. The second byte is used to specify the address of an internal  
control register and is based on the MSB-first configuration.  
MSB  
A7  
LSB  
A0  
A6  
A5  
A4  
A3  
A2  
A1  
Figure 7.7 Register Address  
After receiving the second byte (register address), AK8975/C generates an acknowledge then receives the  
third byte.  
The third and the following bytes represent control data. Control data consists of 8 bits and is based on the  
MSB-first configuration. AK8975/C generates an acknowledge after every byte is received. Data transfer  
always stops with a stop condition generated by the master.  
MSB  
D7  
LSB  
D0  
D6  
D5  
Figure 7.8 Control Data  
AK8975/C can write multiple bytes of data at a time.  
D4  
D3  
D2  
D1  
After reception of the third byte (control data), AK8975/C generates an acknowledge then receives the next  
data.  
If additional data is received instead of a stop condition after receiving one byte of data, the address counter  
inside the LSI chip is automatically incremented and the data is written at the next address.  
The address is incremented from 00H to 0CH or from 10H to12H. When the address is in the range from 00H  
to 0CH, the address goes back to 00H after 0CH. When the address is in the range from 10H to 12H, the  
address goes back to 10H after 12H. Actual data is written only to Read/Write registers (0AH to 0FH).  
S
S
T
O
P
T
A
R
T
R/W="0"  
Slave  
Address  
Register  
Address(n)  
Data(n)  
Data(n+1)  
Data(n+x)  
S
P
SDA  
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
Figure 7.9 WRITE Instruction  
MS1187-E-02  
- 20 -  
2010/05  
 
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