L6472 STMICROELECTRONICS [STMicroelectronics], L6472 Datasheet - Page 30

• Manufacturer Part Number: L6472
• Description: dSPIN fully integrated microstepping motor driver
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Functional description
6.13
6.14
6.15
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External switch (SW pin)
The SW input is internally pulled-up to VDD and detects if the pin is open or connected to
ground (see
The SW_F bit of the STATUS register indicates if the switch is open (‘0’) or closed (‘1’) (see
Section
SW_EVN flag of the STATUS register is raised when a switch turn-on event (SW input falling
edge) is detected (see
(see
By default a switch turn-on event causes a HardStop interrupt (SW_MODE bit of the
CONFIG register set to ‘0’). Otherwise (SW_MODE bit of the CONFIG register set to ‘1’),
switch input events do not cause interrupts and the switch status information is at the user’s
disposal (see
The switch input can be used by the GoUntil and ReleaseSW commands as described in
Section 9.2.10
If the SW input is not used, it should be connected to VDD.
Programmable DMOS slew rate, dead time and blanking time
Using the POW_SR parameter in the CONFIG register, it is possible to set the commutation
speed of the power bridge output (see
Integrated analog-to-digital converter
The L6472 integrates an N
reference voltage equal to VREG. The analog-to-digital converter input is available through
the ADCIN pin and the conversion result is available in the ADC_OUT register (see
Section
The ADC_OUT value can be used for the torque regulation or can remain at the user’s
disposal.
Figure 13. External switch connection
Section
9.1.19); the bit value is refreshed at every system clock cycle (125 ns). The
9.1.13). The sampling frequency is equal to the clock frequency divided by 512.
Figure
9.2.20).
Table
and 9.2.11.
).
25).
Section
ADC
Doc ID 022729 Rev 1
bit ramp-compare analog-to-digital converter with a
9.1.19). A GetStatus command releases the SW_EVN flag
Table
27).
L6472