Hardware description and configuration
UM1964
10/24
DocID028481 Rev 1
Note:
If SB41 is short then J1 pins 2 and 3 must also be shorted.
2.1
Selecting the SPI lines
The lines of the SPI interface can be selected through the dedicated solder bridges. The
following table (
) shows the possible options for the STM32 Nucleo board and
Arduino Uno R3.
Table 4. Jumper table
Jumper
Permitted configurations
Default condition
J1
Selection for L6470 VDD:
– 2-3 short: ST1S14 is inhibited.
1-2 short and 3-4 short: ST1S14 is enabled, any L6470
VDD is connected to the +3.3V coming from the ST1S14
(step down monolithic power switching regulator).
Note: short SB40 if you intend to supply the STM32 Nucleo
board through the X-NUCLEO-IHM02A1; if so, refer to the
section in the STM32 Nucleo board User Manual (available
on www.st.com) regarding external power supply.
SB40 open otherwise.
SB41 must be open.
2-3 short
J2
Selection for L6470 external switch input pin:
– Connect a limit switch between 1-2 or 3-4 for L6470 #1.
– Connect a limit switch between 5-6 or 7-8 for L6470 #0
All open
J3
Step-clock input for L6470 #0.
Open
J4
Step-clock input for L6470 #1.
Open
Table 5. Screw terminal table
Screw terminal
Function
ST1
To connect the two couples of wires connected to the two motors phases with the
two full bridge output couples of L6470 #1.
ST2
To connect the two couples of wires connected to the two motors phases with the
two full bridge output couples of L6470 #0.
ST3
motors power supply input (8V÷45V).
