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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]  
7.1.2. Reading Data  
Input the R/W control bit (R/W=“1”) and 7 bit register address on SI pin in synchronous with the first 8 bits of  
the 16 bits of a serial clock input on SK pin. Then AK8975/C outputs the data held in the specified register  
with MSB first from SO pin.  
When clocks are input continuously after one byte of data is read, the address is incremented and data in the  
next address is output. Accordingly, after the falling edge of the 15th clock and CSB pin is “L”, the data in the  
next address is output on SO pin. When CSB pin is driven “L” to “H”, SO pin is placed in the high-impedance  
state.  
AK8975/C has two incrementation lines; 00H to 0CH and 10H to 12H. For example, data is read as follows:  
00H -> 01H ... -> 0BH -> 0CH -> 00H -> 01H ..., and 10H -> 11H -> 12H -> 10H …  
When specified address is other than 00H to 12H, AK8975/C recognizes that it is not selected and keeps SO  
pin in high-impedance state. Therefore, user can use other addresses for other devices.  
CSB  
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16  
SK  
SI  
(INPUT)  
RW A6  
A5  
A4  
A3  
A2  
A1  
A0  
Hi-Z  
Hi-Z  
SO  
(OUTPUT)  
D7 D6 D5 D4  
D3 D2 D1  
D0  
Figure 7.2 4-wire SPI Reading Data  
MS1187-E-02  
- 17 -  
2010/05  
 
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