L6470HTR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6470HTR' PDF : 73 Pages View PDF
L6470
Functional description
6.17.1
6.17.2
BUSY operation mode
The pin works as busy signal when the SYNC_EN bit is set low (default condition). In this
mode the output is forced low while a constant speed, absolute positioning or motion
command is under execution. The BUSY pin is released when the command has been
executed (target speed or target position reached). The STATUS register includes a BUSY
flag that is the BUSY pin mirror (see Section 9.1.22 on page 55).
In the case of daisy chain configuration, BUSY pins of different ICs can be hard-wired to
save host controller GPIOs.
SYNC operation mode
The pin works as synchronization signal when the SYNC_EN bit is set high. In this mode
a step-clock signal is provided on the output according to a SYNC_SEL and STEP_SEL
parameter combination (see Section 9.1.19 on page 47).
6.18
FLAG pin
By default, an internal open drain transistor pulls the FLAG pin to ground when at least one
of the following conditions occurs:
Power-up or standby/reset exit
Stall detection on A bridge
Stall detection on B bridge
Overcurrent detection
Thermal warning
Thermal shutdown
UVLO
Switch turn-on event
Wrong command
Non-performable command.
It is possible to mask one or more alarm conditions by programming the ALARM_EN
register (see Section 9.1.20 on page 49, Table 21 on page 49). If the corresponding bit of
the ALARM_EN register is low, the alarm condition is masked and it does not cause a FLAG
pin transition; all other actions imposed by alarm conditions are performed anyway. In the
case of daisy chain configuration, FLAG pins of different ICs can be or-wired to save host
controller GPIOs.
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