參數(shù)資料
型號： STM6601CQ2BDM6F
廠商： STMICROELECTRONICS
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO12
封裝： 2 X 3 MM, ROHS COMPLIANT, TDFN-12
文件頁數(shù)： 4/51頁
文件大?。?/td> 1237K
代理商： STM6601CQ2BDM6F
Operation
STM6600 - STM6601
Doc ID 15453 Rev 8
3
Operation
The STM6600-STM6601 simplified smart push-button on/off controller with Smart Reset
and power-on lockout enables and disables power for the application depending on push-
button states, signals from the processor, and battery voltage.
Power-on
Because most of the processors have outputs in high-Z state before initialization, an internal
pull-down resistor is connected to PSHOLD input during startup (see Figure 7, 8, 9, 10, 11,
To power up the device the push-button PB has to be pressed for at least tDEBOUNCE and
VCC has to be above VTH+ for the whole tDEBOUNCE period. If the battery voltage drops
below VTH+ during the tDEBOUNCE, the counter is reset and starts to count again when VCC >
VTH+ (see Figure 13). After tDEBOUNCE the enable signal is asserted (EN goes high, EN
goes low), reset output RST is asserted for tREC and then the startup routine is performed
by the processor. During initialization, the processor sets the PSHOLD signal high.
On the STM6600 the PSHOLD signal has to be set high prior to push-button release and
tON_BLANK expiration, otherwise the enable signal is deasserted (EN goes low, EN goes
high) - see Figure 7, 8, 9, and 10. The time up to push-button release represents the
maximum time allowed for the system to power up and initialize the circuits driving the
PSHOLD input. If the PSHOLD signal is low at push-button release, the enable output is
deasserted immediately, thus turning off the system power. If tON_BLANK expires prior to
push-button release, the PSHOLD state is checked at its expiration. This safety feature
disables the power and prevents discharging the battery if the push-button is stuck or it is
held for an unreasonable period of time and the application is not responding (see Figure 8
and 10). PB status, INT status and VCC undervoltage detection are not monitored until
power-up is completed.
On the STM6601 the PSHOLD signal has to be set high before tON_BLANK expires, otherwise
the enable signal is deasserted - see Figure 11 and 12. In this case the tON_BLANK period is
the maximum time allowed for the power switch and processor to perform the proper power-
on. If the PSHOLD signal is low at the end of the blanking period, the enable output is
released immediately, thus turning off the system power. PB status, INT status and VCC
undervoltage detection are not monitored during the entire tON_BLANK period. This failsafe
feature prevents the user from turning on the system when there is a faulty power switch or
an unresponsive microprocessor.
Push-button interrupt
If the device works under normal operation (i.e. PSHOLD is high) and the push-button PB is
pressed for more than tDEBOUNCE, a negative pulse with minimum tINT_Min width is
generated on the INT output. By connecting INT to the processor interrupt input (INT or
NMI) a safeguard routine can be performed and the power can be shut down by setting
PSHOLD low - see Figure 14.
Forced power-down mode
The PSHOLD output can be forced low anytime during normal operation by the processor
and can deassert the enable signal - see Figure 14.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
STM6601CQ2DDM6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Smart push-button on/off controller with Smart ResetTM and power-on lockout
STM6601CQ2DDM6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Smart push-button on/off controller with Smart ResetTM and power-on lockout
STM6601CS2BDM6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Smart push-button on/off controller with Smart ResetTM and power-on lockout
STM6601CS2BDM6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Smart push-button on/off controller with Smart ResetTM and power-on lockout
STM6601CS2DDM6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Smart push-button on/off controller with Smart ResetTM and power-on lockout
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