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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. Serial Interface  
AK8975/C supports I2C bus interface and 4-wire SPI. A selection is made by CSB pin. When used as 3-wire  
SPI, set SI pin and SO pin wired-OR externally.  
CSB pin=“L”:  
4-wire SPI  
CSB pin=“H”: I2C bus interface  
7.1. 4-wire SPI  
The 4-wire SPI consists of four digital signal lines: SK, SI, SO, and CSB. It is compliant with sequencial read  
operation.  
Data consists of Read/Write control bit (R/W), register address (7bits) and control data (8bits).  
CSB pin is low active. Input data is taken in on the rising edge of SK pin, and output data is changed on the  
falling edge of SK pin. (SPI MODE3)  
Communication starts when CSB pin transits to “L” and stops when CSB pin transits to “H”. SK pin must be  
“H” during CSB pin is in transition. Also, it is prohibited to change SI pin during CSB pin is “H” and SK pin is  
“H”.  
7.1.1. Writing Data  
Input 16 bits data on SI pin in synchronous with the 16-bit serial clock input on SK pin. Out of 16 bits input  
data, the first 8 bits specify the R/W control bit (R/W=“0” when writing) and register address (7bits), and the  
latter 8 bits are control data (8bits). When any of addresses listed on Table 8.1 is input, AK8975/C recognizes  
that it is selected and takes in latter 8 bits as setting data.  
If the number of clock pulses is less than 16, no data is written. If the number of clock pulses is more than 16,  
data after the 16th clock pulse on SI pin are ignored.  
It is not compliant with sereal write operation for multiple addresses.  
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  
D7 D6 D5 D4  
D3 D2 D1  
D0  
Hi-Z  
Figure 7.1 4-wire SPI Writing Data  
SO  
(OUTPUT)  
MS1187-E-02  
- 16 -  
2010/05  
 
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