L6470 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6470' PDF : 73 Pages View PDF
L6470
Functional description
On exiting Standby mode, the bridges are disabled (HiZ flag high) and any motion command
makes the device exit High Z state (HardStop and SoftStop included).
Attention: It is not recommended to reset the device when outputs are
active. The device should be switched to high impedance
state before being reset.
6.13
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 Figure 12).
The SW_F bit of the STATUS register indicates if the switch is open (‘0’) or closed (‘1’) (see
Section 9.1.22 on page 55); the bit value is refreshed at every system clock cycle (125 ns).
The SW_EVN flag of the STATUS register is raised when a switch turn-on event (SW input
falling edge) is detected (see Section 9.1.22). A GetStatus command releases the SW_EVN
flag (see Section 9.2.20 on page 66).
By default, a switch turn-on event causes a HardStop interrupt (SW_MODE bit of CONFIG
register set to ‘0’). Otherwise (SW_MODE bit of CONFIG register set to ‘1’), switch input
events do not cause interrupts and the switch status information is at the user’s disposal
(see Table 34 on page 55, Section 9.1.22).
The switch input may be used by the GoUntil and ReleaseSW commands as described in
Section 9.2.10 on page 62 and 9.2.11 on page 63.
If the SW input is not used, it should be connected to VDD.
Figure 12. External switch connection
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6.14
Programmable DMOS slew rate, deadtime and blanking time
Using the POW_SR parameter in the CONFIG register, it is possible to set the commutation
speed of the power bridges output (see Table 26 on page 51, Section 9.1.21 on page 49).
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