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L9942 Datasheet(PDF) 17 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) 17 Page - STMicroelectronics

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L9942
3 Electrical specifications
17/37
Figure 7.
Logic to Set Load Current Limit
3.4.7
PWM Control
VS = 7 to 20 V, VCC = 3.0 to 5.3 V, EN=VCC, Tj = -40 to 150 °C, IREF = -200 µA, unless
otherwise specified. The voltages are referred to GND and currents are assumed positive,
when the current flows into the pin.
Table 13.
PWM Control (see
Figure 4 and Figure 7)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
fPWM
1
Frequency of PWM cycles
Bit: FRE= 1
20.8
kHz
Bit: FRE= 0
31.3
kHz
TMD
1
Mixed decay switch off delay time
Bits: DM1 DM0= 0 1
4
us
Bits: DM1 DM0= 1 0
8
us
TFT
1
Glitch filter delay time
Bit: FILTER= 0
1.5
us
Bit: FILTER= 1
2.5
us
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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