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FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
AUTORESTART STRATEGY
The autorestart circuitry is used to supervise the outputs
and reactivate high side switches in cases of overload or
under-voltage failure conditions, to provide a high availability
of the outputs.
Autorestart feature is available in Fail mode when no
supervising intelligence of the microcontroller is available.
Autorestart is activated in case of overload condition (OCHI2
or OCLO) or under-voltage condition on VBAT (see
The autorestart switches ON the outputs. During ON state
of the switch OCHI1 window is enabled for tochi_Auto, then
after the output is protected by OCLO.
Output current
OCHI1
OCLO or UV fault
OCLO
In case of under-voltage in Fail mode, the outputs 1 to 5
will be latched off. The corresponding output is switched on
only after its autorestart period (t AUTORST-T1 or t AUTORST-T2 ).
The Autorestart is not limited in time.
TRANSITION FAIL TO NORMAL MODE
To leave the Fail mode, the fail condition must be removed
(fail=0). The microcontroller has to toggle the SPI D10 bit (0
to 1) to reset the watchdog bit; the other bits are not
considered. The previous latched faults are reset by the
transition into Normal mode.
TRANSITION NORMAL TO FAIL MODE
To leave the Normal mode, a fail condition must occur
(fail=1). The previous latched faults are reset by the transition
into Fail mode.
If the SI is shorted to VCC, the device transmits to Fail
Safe mode until the WD bit toggles through the SPI (from [0]
to [1]).
All settings are according to predefined values (all bits set
to logic [0]).
START-UP SEQUENCE
The 10XS3535 enters in Normal mode after start-up if
following sequence is provided:
?VBAT and VCC power supplies must be above their
tochi_auto
Auto period
time
under-voltage thresholds (Sleep mode).
?generate wake up event (wake=1) from 0 to 1 on RST .
The device switches to Normal mode.
Figure 9. Over-current window in case of Autorestart
In case of OCHI1 or OT, the switch is latched OFF until
wake-up (wake=0 then 1).
In case of OCLO or under-voltage, the output switch OFF
and after auto restart period (150 ms for 10 mohm or 75 ms
?apply PWM clock after maximum 200 ? s (min. 50 ? s).
?send SPI command to the Device status register to clear
the clock fail flag to enable the PWM module to start.
Figure 10 describes the wake-up block diagram.
for 35 mOhm) turn ON again.
MC10XS3535
Analog Integrated Circuit Device Data ?
26
Freescale Semiconductor
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