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L9942 Datasheet(PDF) 19 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) 19 Page - STMicroelectronics

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L9942
Electrical specifications
Doc ID 11778 Rev 7
19/40
Note:
Current profile has to pre set with I4 I3 I2 I1 I0 = 11111 and load to register 1.
Output current limit IQxnLIM is product of full scale current |IQxnFS_ | (bits DC2 DC1 DC0) and
value of DAC Phase A/B (bits I4 I3 I2 I1 I0) in register1.
Values of DAC Phase A and B can read out and depends on set up done before:
1.
direction DIR, stepping mode ST1 ST0 and phase counter P4 P3 P2 P1 P0 in register 0 and
2.
value of corresponding current profile (for address of current profile entry see also
Figure 3).
Figure 7.
Logic to set load current limit
Register 0
UP/Down
STEP
I4
I3
I2
I1
I0
Count by
1,2,4,8
A0
A1
A2
A3
MUX
A0
A1
A2
0
0
0
0 1 23 01 2 3 0 1 2 3
Current-Profile Table
stored in register2, ...6
A3=0
Adr
A[3..0]
Phase A
Profile 8
Address Calculation
I4
I3
I2
I1
I0
Profile 7
I4
I3
I2
I1
I0
Profile 6
I4
I3
I2
I1
I0
Profile 5
I4
I3
I2
I1
I0
Profile 4
I4
I3
I2
I1
I0
Profile 3
I4
I3
I2
I1
I0
Profile 2
I4
I3
I2
I1
I0
Profile 1
I4
I3
I2
I1
I0
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
P0
P1
P2
P3
P4
PhaseCounter
StepMode
SR0
SR1
ST1 ST0
Slew Rate
DM2
DM1
DM0
MUX
MUX
I0
I1
I2
I3
I4
I0
I1
I2
I3
I4
DAC Phase B
DAC Phase A
Decay Mode
5 bit DAC
Phase A
5 bit DAC
Phase B
DC0
DC1
DC2
DAC Scale
DAC
Full Scale
REF
REF
I
MAX
I
LIMIT B
LIMIT A
I
DI
QB1
QB2
QA1
QA2
Qx1LIM
I
Qx2LIM
I
QA1LIM
I
1000
QB2LIM
I
1000
QB1LIM
I
1000
QA2LIM
I
1000



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