1.Application products:
North seeking MEMS Gyro ER-MG2-100
Navigation grade MEMS Gyro ER-MG2-300/400
Tactic grade MEMS Gyro ER-MG-067
2.SPI timing
MEMS gyro sensor data is realized by accessing and reading the specified register address.Similarly, control of the MEMS gyro is achieved by writing the value to the specified register.
MEMS gyro realizes register access through 4-line SPI hardware interface timing sequence, and writes or reads registers with specified address. The SPI interface of MEMS gyro adopts Mode 3 timing sequence type for slave Mode. That is, CPOL = 1, CPHA = 1. Before CS was pulled down, the default level of Clock was high, and the data was read on the rising edge.
Figure 6 SPI timing parameters
| Symbol | Parameters | Condition | Min | Typical | Max | Unit |
| Fsclk | SPI clock frequency | DIN/DOUT maximum load 20pF | / | 4 | 8 | MHz |
| t1 | Slice to clock edge | / | 200 | / | / | ns |
| t2 | SCLK after the edge
DOUT valid time |
/ | / | / | 62.5 | ns |
| t3 | SCLK rises along the previous DIN establishment time | / | 10 | / | / | ns |
| t4 | SCLK rises after DIN holds time | / | 10 | / | / | ns |
| Tdr，Tdf | DOUT rise and fall times, not shown | VIO 3.3V | / | 10 | / | ns |
| t5 | SCLK after the edge
SSB high level time |
/ | 200 | / | / | ns |
| t6 | Two SPI access intervals | / | 500 | / | / | ns |
Table 2 SPI timing parameters
2.SPI read write control
Figure 7 SPI single byte write timing
Figure 8 SPI single byte read timing
Figure 9 SPI multi-byte write timing
Figure 10 SPI multi-byte read timing
Remark:
| W/R： | SPI read and write control bits | |||
| / | 0： | SPI write operation | ||
| / | 1： | SPI read operation | ||
| INC： | SPI reads and writes single - byte, multi - byte instructions | |||
| / | 0： | SPI single byte reads and writes | ||
| / | 1： | SPI address multibyte reads and writes | ||
| A5~A0： | SPI operation address | |||
| / | range： | 0x00 ~ 0x3F | ||
| D7~D0： | SPI operates on data | |||
| / | range： | 0x00 ~ 0xFF | ||
More Technical Questions
1.Feasibility Analysis of MEMS Gyro North Seeking
2.The Calibration Method of High Precision MEMS Gyro
3.The Test of High Performance North Seeking MEMS Gyroscope
4.How to Distinguish MEMS Accelerometer and MEMS Gyroscope Correctly?
5.ER-MG2-100 (0.02°/h) High Precision MEMS Gyroscope
6.Analysis of the main performance parameters of MEMS gyroscope
Products in Article
