AK7451 Datasheet, PDF (13/32 Pages) Asahi Kasei Microsystems – zero latency angle sensor ic

[AK7451]
14. Serial Interface
When register/memory setting or absolute angle measurement is needed, use SPI communication.
The serial communication protocol and each register/memory description are described in this section.
● Data format
1) Write memory/register in User Mode
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
CS
SCL
MOSI
* O3 O2 O1 O0 A6 A5 A4 A3 A2 A1 A0 * D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 *
MISO
Hi-Z
2) Read mem₁ory₂ re₃gis₄ ter₅ in₆ Us₇ er₈Mo₉ de_{10 11 12 13 14 15 16 17 18 19 20 21 22 23 24}
CS
SCL
MOSI
MISO
* O3 O2 O1 O0 A6 A5 A4 A3 A2 A1 A0
*
Hi-Z
Hi-Z
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
3) Read angle data in Normal Mode
123456789
CS
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SCL
MOSI
* O3 O2 O1 O0
*
MISO
Hi-Z
MD P1 P2 E D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 ^Hi-Z
Figure 6. Timing Chart of Serial I/F
Note 6. Figure symbols are as following;
‘Ox’: Operation Code
‘Ax’: Memory/Register Address
‘MD’: Mode Information （MD is “0” in Normal Mode, And “1” in User Mode
‘Dx’: Data
‘P1’: Parity Bit for Angle Data[11:6]
‘P2’: Parity Bit for Angle Data[5:0]
‘E’ : Error Bit (Normal=1,Abnormal=0)
‘*’ :
Don’t Care.
016006637-E-00
- 13 -
2016/05