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L9942 Scheda tecnica(PDF) 37 Page - STMicroelectronics

Il numero della parte L9942
Spiegazioni elettronici  Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile
PDF  40 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9942 Scheda tecnica(HTML) 37 Page - STMicroelectronics

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L9942
Appendix
Doc ID 11778 Rev 7
37/40
Figure 17.
Reference generation for PWM control (decay)
Register 0
UP/Down
STEP
Count by
1,2,4,8
A0
A1
A2
A3
MUX
A0
A1
A2
0
0
0
01
23
01
2 3
01
23
Current-Profile Table
stored in register2, ...6
A3=0
Adr
A[3..0]
Phase A
Profile 8
Address Calculation
1111
0
Profile 7
Profile 6
Profile 5
Profile 4
Profile 3
0110
0
Profile 2
0011
0
Profile 1
00
0
0
0
Profile 0
5
5
5
5
5
5
5
5
5
A3=1
Adr
neg(A[3..0])
A3=0
Adr
neg(A[3..0])
Phase B
A3=1
Adr A[3..0]
Register 1
9
5
DIR
0
1
0
PhaseCounter
StepMode
SR0
SR1
0
0
Slew Rate
DM2
DM1
DM0
MUX
MUX
0
1
1
1
1
0
1
1
0
0
DAC Phase B
DAC Phase A
Decay Mode
5 bit DAC
Phase A
5 bit DAC
Phase B
0
0
0
DAC Scale
DAC
Full Scale
REF
REF
I
MAX
I
LIMIT B
I
LIMIT A
I
DI
HS1 on
HS2 on
HS1 on
LS2on
0
1 23 4 5 6 787 654 3 2 1 012 3 456 7876 5 4 32 1
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
01 234
5 6 7
876 5
432 1012 3 4
56 7
8
7 65 4 3 2 1
Current Driver A
Current Driver B
STEP Signal
Adress of Current
Profile Entry
Phase A
Phase Counter
Adress of Current
Profile Entry
Phase B
0
0
0
95 mA
100mA * 6/31 = 18.4mA
95mA * 30/31 = 91.9mA
200 uA
1011
0
1101
0
1110
1
10
0
0
1
1111
1
Auto Decay
Mixed Decay
Slow Decay
Fast and Slow
Decay
A
I
1
1
Counter value changes after an signal at STEP to next one
depending on selected stepping mode described in figure 1.2
(e.g. during micro stepping to value 2) .
Slow
Decay
Fast
Decay
QA1
QA2
+
-
-
+
-
2mA
+
-
2mA
-
+
-
-
+
-
2mA
+
-
2mA
-
B
I
QB1
I
1000
QB1
QB2
+
-
-
+
HSB1
OC
-
2mA
+
-
2mA
-
+
-
-
+
-
2mA
+
-
LIMIT
2mA
LSB2
-
HS Current
Monitoring
(Overcurrent)
LS Current
Monitoring
(Load Control)
HS Current
Monitoring
(Overcurrent)
HS Current
Monitoring
(Overcurrent)
HSA1
OC
HSB1
OC



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