l9942 STMicroelectronics, l9942 Datasheet - Page 5
l9942
Manufacturer Part Number
l9942
Description
Integrated Stepper Motor Driver For Bipolar Stepper Motors With Microstepping And Programmable Current Profile
Manufacturer
STMicroelectronics
Datasheet
1.L9942.pdf
(40 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
L9942
Manufacturer:
FREESCALE
Quantity:
90
Part Number:
L9942
Manufacturer:
ST
Quantity:
20 000
Part Number:
l9942XP
Manufacturer:
ST
Quantity:
20 000
Company:
Part Number:
l9942XP1
Manufacturer:
st
Quantity:
33 040
Part Number:
l9942XP1
Manufacturer:
ST
Quantity:
20 000
Company:
Part Number:
l9942XP1TR
Manufacturer:
st
Quantity:
33 040
Part Number:
l9942XP1TR
Manufacturer:
ST
Quantity:
20 000
Part Number:
l9942XPTR
Manufacturer:
ST
Quantity:
20 000
L9942
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Stepping modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Decay modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Thermal data of package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
VS monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Logic to set load current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Switching on minimum time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SPI and registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Transfer timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Input timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
SPI - DO Valid data delay time and valid time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
DO enable and disable time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Timing of status bit 0 (fault condition) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Stall detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Reference generation for PWM control (switch on) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Reference generation for PWM control (decay) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
List of figures
5/40