DRV8711_15 Datasheet, PDF (25/44 Pages) Texas Instruments – DRV8711 Stepper Motor Controller IC

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Programming (continued)
DRV8711
SLVSC40E – JUNE 2013 – REVISED MARCH 2015
SCS
SCLK
1
2
3
4
5
6
7
8 Note 1 9
10
11
12
13
14
15
16
SDATI
WRT A2
A1
A0 D11 D10
D9
D8
X
D7 D6
D5
D4 D3
D2
D1
D0
A. Any amount of time may pass between bits, as long as SCS stays active high. This allows two 8-bit writes to be used.
Figure 17. Write Operation
Data may be read from the registers through the SDATO pin. During a read operation, only the address is used
form the SDATI pin; the data bits following are ignored. The first bit at the beginning of the access must be logic
high for a read operation.
SCS
SCLK
1
2
3
4
5
6
7
8
Note 1 ₉
10
11
12
13
164
15
16
SDATI
READ A2
A1
A0
SDATO
D11 D10 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
(1) Any amount of time may pass between bits, as long as SCS stays active high. This allows two 8-bit writes to be used.
Figure 18. Read Operation
7.6 Register Maps
7.6.1 Control Registers
The DRV8711 uses internal registers to control the operation of the motor. The registers are programmed
through a serial SPI communications interface. At power up or reset, the registers will be preloaded with default
values as shown in CTRL Register Address = 0x0h to STATUS Register Address = 0x7h.
Figure 19 is a map of the DRV8711 registers.
Individual register contents are defined in CTRL Register Address = 0x0h to STATUS Register Address = 0x7h.
DRV8711 REGISTER MAP
Name
11
10
9
8
7
6
5
4
3
2
CTRL
DTIME
ISGAIN
EXSTALL
MODE
RSTEP
TORQUE Reserved
SMPLTH
TORQUE
OFF
Reserved
PWMMODE
TOFF
BLANK
Reserved
ABT
TBLANK
DECAY Reserved
DECMOD
TDECAY
STALL
VDIV
SDCNT
SDTHR
DRIVE
IDRIVEP
IDRIVEN
TDRIVEP
TDRIVEN
OCPDEG
STATUS
Reserved
STDLAT
STD
UVLO
BPDF
APDF
BOCP
Name
11
10
9
8
7
6
5
4
3
2
Figure 19. DRV8711 Register Map
1
RDIR
0
ENBL
Address
Hex
RW
00
RW
01
RW
02
RW
03
RW
04
RW
05
OCPTH
RW
06
AOCP
1
OTS
0
RW
07
Address
Hex
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