STM6600GS22DM6F datasheet(13/51 Pages) STMICROELECTRONICS

13 / 51 page

STM6600 - STM6601

Operation

Doc ID 15453 Rev 7

13/51

Undervoltage detection

If VCC voltage drops below VTH- voltage threshold during normal operation, the INT output is

driven low (see Figure 20 and Figure 21).

If an undervoltage condition is detected for tDEBOUNCE + tINT_Min + tSRD, 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 tDEBOUNCE + tINT_Min + tSRD, and then

either the reset output RST is asserted for tREC and the processor is reset (valid

only for the device with option “RST asserted by long push”) – see Figure 18

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 tSRD is set by the external capacitor connected to the CSRD pin.

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.

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