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L9942 Datasheet(PDF) 25 Page - STMicroelectronics

Part # L9942
Description  Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile
PDF  40 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9942 Datasheet(HTML) 25 Page - STMicroelectronics

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L9942
SPI - control and status registers
Doc ID 11778 Rev 7
25/40
5.4
Register 3
The meaning of the different bits is as follows:
5.5
Register 4 and 5
The meaning of the different bits is as follows:
Table 17.
Register 3
Bit
Current profile 3
PWM counter
PWM
Current profile 2
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
0
0
0
0
0
0
0
0
0
Name
I4
I3
I2
I1
I0
D1
D0
NPW M
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
D1 D0
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.
-
Table 18.
Register 4 and 5
Bit
Current profile 5 (7)
PWM counter
Current profile 4 (6)
12
11
10
987
6
5
4
3
21
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
000
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 loaded needed. 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)



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