STM32F302CB View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STM32F302CB Datasheet PDF : 144 Pages
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STM32F302xB STM32F302xC
Functional overview
3.7
3.7.1
Power management
Power supply schemes
• VSS, VDD = 2.0 to 3.6 V: external power supply for I/Os and the internal regulator. It is
provided externally through VDD pins.
• VSSA, VDDA = 2.0 to 3.6 V: external analog power supply for ADC, DAC, comparators
operational amplifiers, reset blocks, RCs and PLL. The minimum voltage to be applied
to VDDA differs from one analog peripheral to another. Table 3 provides the summary of
the VDDA ranges for analog peripherals. The VDDA voltage level must be always
greater or equal to the VDD voltage level and must be provided first.
• VBAT = 1.65 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and
backup registers (through power switch) when VDD is not present.
Table 3. External analog supply values for analog peripherals
Analog peripheral
Minimum VDDA supply
Maximum VDDA supply
ADC / COMP
2.0 V
3.6 V
DAC / OPAMP
2.4 V
3.6V
3.7.2
3.7.3
Power supply supervision
The device has an integrated power-on reset (POR) and power-down reset (PDR) circuits.
They are always active, and ensure proper operation above a threshold of 2 V. The device
remains in reset mode when the monitored supply voltage is below a specified threshold,
VPOR/PDR, without the need for an external reset circuit.
• The POR monitors only the VDD supply voltage. During the startup phase it is required
that VDDA should arrive first and be greater than or equal to VDD.
• The PDR monitors both the VDD and VDDA supply voltages, however the VDDA power
supply supervisor can be disabled (by programming a dedicated Option bit) to reduce
the power consumption if the application design ensures that VDDA is higher than or
equal to VDD.
The device features an embedded programmable voltage detector (PVD) that monitors the
VDD power supply and compares it to the VPVD threshold. An interrupt can be generated
when VDD drops below the VPVD threshold and/or when VDD is higher than the VPVD
threshold. The interrupt service routine can then generate a warning message and/or put
the MCU into a safe state. The PVD is enabled by software.
Voltage regulator
The regulator has three operation modes: main (MR), low-power (LPR), and power-down.
• The MR mode is used in the nominal regulation mode (Run)
• The LPR mode is used in Stop mode.
• The power-down mode is used in Standby mode: the regulator output is in high
impedance, and the kernel circuitry is powered down thus inducing zero consumption.
The voltage regulator is always enabled after reset. It is disabled in Standby mode.
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