Datasheet

STM6600, STM6601 Operation
Doc ID 15453 Rev 11 13/52
If an undervoltage condition is detected for t
DEBOUNCE
+ t
INT_Min
+ t
SRD
, the enable output is
deasserted (see Figure 21).
Hardware reset or power-down while system not responding
If the system is not responding and the system hangs, the PB
and SR push-buttons can be
pressed simultaneously longer than t
DEBOUNCE
+ t
INT_Min
+ t
SRD
, and then
a) either the reset output RST
is asserted for t
REC
and the processor is reset (valid
only for the device with option “RST
asserted by long push”) – see Figure 18
b) or the power is disabled by EN or EN
signal (valid only for the device with option
“EN deasserted by long push”) – see Figure 19
The t
SRD
is set by the external capacitor connected to the C
SRD
pin. SR input is monitored
for falling edge after power-up and must not be grounded permanently.
Standby
If the enable output is deasserted (i.e. EN is low or EN
is high), the STM660x device enters
standby mode with low current consumption (see Table 5). In standby mode PB
input is only
monitored for the falling edge. The external 1.5 V voltage reference is also disabled in
standby mode.