STM32L100RC Datasheet, PDF (14/104 Pages) STMicroelectronics – Reset and supply management

Functional overview
STM32L100RC
Note:
• Stop mode without RTC
Stop mode achieves the lowest power consumption while retaining the RAM and
register contents. All clocks are stopped, the PLL, MSI RC, HSI and LSI RC, LSE and
HSE crystal oscillators are disabled. The voltage regulator is in the low-power mode.
The device can be woken up from Stop mode by any of the EXTI line, in 8 µs. The EXTI
line source can be one of the 16 external lines. It can be the PVD output, the
Comparator 1 event or Comparator 2 event (if internal reference voltage is on). It can
also be wakened by the USB wakeup.
• Standby mode with RTC
Standby mode is used to achieve the lowest power consumption and real time clock.
The internal voltage regulator is switched off so that the entire V_CORE domain is
powered off. The PLL, MSI RC, HSI RC and HSE crystal oscillators are also switched
off. The LSE or LSI is still running. After entering Standby mode, the RAM and register
contents are lost except for registers in the Standby circuitry (wakeup logic, IWDG,
RTC, LSI, LSE Crystal 32K osc, RCC_CSR).
The device exits Standby mode in 60 µs when an external reset (NRST pin), an IWDG
reset, a rising edge on one of the three WKUP pins, RTC alarm (Alarm A or Alarm B),
RTC tamper event, RTC timestamp event or RTC Wakeup event occurs.
• Standby mode without RTC
Standby mode is used to achieve the lowest power consumption. The internal voltage
regulator is switched off so that the entire V_CORE domain is powered off. The PLL, MSI
RC, HSI and LSI RC, HSE and LSE crystal oscillators are also switched off. After
entering Standby mode, the RAM and register contents are lost except for registers in
the Standby circuitry (wakeup logic, IWDG, RTC, LSI, LSE Crystal 32K osc,
RCC_CSR).
The device exits Standby mode in 60 µs when an external reset (NRST pin) or a rising
edge on one of the three WKUP pin occurs.
The RTC, the IWDG, and the corresponding clock sources are not stopped automatically by
entering Stop or Standby mode.
Table 2. Functionalities depending on the operating power supply range
Functionalities depending on the operating power supply range
Operating power
supply range
DAC and ADC
operation
USB
Dynamic
voltage scaling
range
I/O operation
V_DD = 1.8 to 2.0 V
Conversion time
up to 500 Ksps
Not functional
Range 2 or
range 3
Degraded speed
performance
V_DD = 2.0 to 2.4 V
Conversion time
up to
500 Ksps
Functional⁽¹⁾
Range 1, range 2
or range 3
V_DD = 2.4 to 3.6 V
Conversion time
up to
1 Msps
Functional⁽¹⁾
Range 1, range 2
or range 3
1. To be USB compliant from the IO voltage standpoint, the minimum V_DD is 3.0 V.
Full speed operation
Full speed operation
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DocID024995 Rev 4