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L9942 Datasheet(PDF) 23 Page - STMicroelectronics

Part # L9942
Description  Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9942 Datasheet(HTML) 23 Page - STMicroelectronics

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L9942
5 SPI - Control and Status Registers
23/37
The meaning of the different bits is as follows:
5.5
Counter and Profile (Register 4 and Register 5)
The meaning of the different bits is as follows:
5.6
Control, Status and Profile Register 6
The meaning of the different bits is as follows:
I4 I3 I2 I1 I0
These bits are loaded in register1 DAC Phase A or B if needed.
See also parameter
Table 12
DT1 DT0
These bits are for threshold value in counter of active time
during signal PWM.
NPWM
This bit switches internal PWM signal of bridge A to pin PWM if
it is set to 0, otherwise pin is in high resistance status.
(T5 T4 T3)
These bits are used in test mode only.
Bit
Current Profile 5 (7)
PWM Counter
Current Profile 4 (6)
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
r w
r w
r w
r w
r w
r w
r w
r w
r w
r w
r w
r w
r w
Reset
0
0
0
0
00
0
0
0
0
00
0
Name
I4
I3
I2
I1
I0
D4(7)
D3(6)
D2(5)
I4
I3
I2
I1
I0
I4 I3 I2 I1 I0
These bits are loadedneeded. in register1 DAC Phase A
or B if needed.
See also parameter
Table 12
D4 D3 D2 (register4) These bits are for threshold value in counter of active time
during signal PWM. LSB and next value are set in
register3 by D0 and D1.
D7 D6 D5 (register5)
CLR
ST
(PWM)
Filter
Freq
ST
REF
ERR
Openload
Current Profile 8
Bit
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
r w
r w
r w
r w
r
r
r
r
r w
r w
r w
r w
r w
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
Name
CLR6
SST
FT
FRE
ST
RERR
OB
OA
I4
I3
I2
I1
I0
I4 I3 I2 I1 I0
These bits are loaded in register1 DAC Phase A or B if
needed
See also parameter
Table 12
OB OA
These bits indicate openload at bridges
RERR
This bit indicates if reference current is OK (150uA <IREF < 250uA), then is RERR=0.
ST
This bit indicates stall detection.
FRE
This bit sets frequency of PWM cycle. FRE=1 frequency 20kHz, FRE=0 frequency 30kHz



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