STM6600HS54DM6F(2010) データシートの表示（PDF） - STMicroelectronics

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STM6600HS54DM6F
(Rev.:2010)

STM6601 Smart push-button on/off controller with Smart Reset™ and power-on lockout

STMicroelectronics 

STM6600 - STM6601

Pin descriptions

EN or EN - enable output

This output is intended to enable system power (see Figure 1). EN is asserted high after

a valid turn-on event has been detected and confirmed (i.e. push-button has been pressed

and held for tDEBOUNCE or more and VCC > VTH+ voltage level has been detected - see

Figure 13). EN is released low if any of the conditions below occur:

a) the push-button is released before PSHOLD is driven high (valid for STM6600, see

Figure 9) or tON_BLANK expires before PSHOLD is driven high during startup (valid

for both STM6600 and STM6601, see Figure 10 and 12).

b) PSHOLD is driven low during normal operation (see Figure 14).

c) an undervoltage condition is detected for more than tSRD + tINT_Min + tDEBOUNCE

(see Figure 21).

d) a long push of the buttons is detected (only for the device with option “EN

deasserted by long push” - see Figure 19) or PSHOLD is not driven high during

tON_BLANK after a long push of the buttons (only for the device with option “RST

asserted by long push” - see Figure 18).

Described logic levels are inverted in case of EN output. Output type is push-pull by default.

RST - reset output

This output pulls low for tREC:

a) during startup. PB has been pressed (falling edge on the PB detected) and held

for at least tDEBOUNCE and VCC > VTH+ (see Figure 7, 8, 9, 10, 11, 12 and 13 for

more details).

b) after long push detection (valid only for the device with option “RST asserted by

long push”). PB has been pressed (falling edge on the PB detected) and held for

more than tDEBOUNCE + tSRD (additional Smart Reset™ delay time can be adjusted

by the external capacitor CSRD) - see Figure 18.

Output type is active low and open drain by default. Open drain output type requires a pull-

up resistor. A 10 kΩ is sufficient in most applications.

INT - interrupt output

While the system is under normal operation (PSHOLD is driven high, power for application is

asserted), the INT is driven low if:

a) VCC falls below VTH- threshold (i.e. undervoltage is detected - see Figure 20 and

21).

b) the falling edge on the PB is detected and the push-button is held for tDEBOUNCE or

more. INT is driven low after tDEBOUNCE and stays low as long as PB is held. The

INT signal is held high during power-up.

The state of the PBOUT output can be used to determine if the interrupt was caused by

either the assertion of the PB input, or was due to the detection of an undervoltage condition

on VCC.

INT output is asserted low for at least tINT_Min.

Output type is active low and open drain by default. Open drain output type requires a pull-

up resistor. A 10 kΩ is sufficient in most applications.

GND - ground

Doc ID 15453 Rev 7

11/51

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