SH33F2801PSLASH032PR datasheet(47/407 Pages) SINOWEALTH

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SH33F2801

Power Control (PWR)

The system operating voltage (VDD) of SH33F2801 is 2.4 to 5.5V. An embedded linear voltage regulator is used to supply

the system core power.

The SH33F2801 has a complete set of power-on reset and brownout detection (BOD) circuits, the BOD is important in

some battery applications.

9.1

Brownout Detection (BOD)



Enable by setting register



Both rising and falling can generate an interrupt



Adjustable voltage detection



Has hysteresis to reduce the impact of voltage fluctuations



Hardware debounce, debounce time is about

60μs



Wake-up stop mode

Brownout detection is used to monitor the supply voltage. If the voltage is above or below the specified value, an internal

flag is generated and an interrupt is generated. It is mainly used to detect changes in the voltage of power and is also used to

monitor the power supply of the system. In some applications, it can be used for low-voltage detection, and the system software

can take some protection measures according to it such as data backup, site retention, etc.

BOD can cause an NMI interrupt, enabled by the IEN_BOD@SYSCFG_SAFR control bit.

9.2

Low-voltage Reset (LVR)

In AC or high-capacity battery applications, switching on a large load can easily cause the MCU power supply to

temporarily fall below the set operating voltage. A low voltage reset means that the protection system generates a valid reset

below the set voltage.

 Can be chosen to be turned on via power control register, and can set LVR voltage via power control register

 Debounce time of LVR-TLVR is about 60µs.

 When power voltage is lower than the set voltage VLVR, internal reset will be generated.

After LVR function is turned on, it has the following features (t indicates the duration of which the voltage is lower than the

set voltage VLVR):

When VDD ≤ VLVR and t ≥ TLVR, system reset is generated.

When VDD > VLVR or VDD < VLVR, but the duration t < TLVR, system reset will not be generated.

9.3

Low Consumption Management

SH33F2801 can reduce system power consumption by:



Use low voltage power supply;



Lower system clock;



Turn off unused peripheral clocks on APB and AHB buses (default is off);



Lower the current on GPIO and peripheral interface circuits;

SH33F2801 supports two low power modes:



Sleep Mode: basic low power mode, the MCU core stops running, but the peripherals used, including the core

peripherals of the CPU, such as NVIC, SysTick, etc. are still running;



Stop Mode: deep low power mode, in addition to shutdown of the core, most of the peripherals used are stopped,

leaving only individual peripherals that are responsible for the wake-up task to keep running (clocks provided by

LSI), such as IWDT, BOD, LVR, etc.

Table9-1

Low Consumption Modes

Mode

Enter

Wake-Up

Wake-up Delay

Sleep

Mode

WFI/WFE, keep

SLEEPDEEP=0

Any interrupt/wake-up

event/reset signal

None

Stop

Mode

WFI/WFE, keep

SLEEPDEEP=1

Any external

interrupt/reset signal

1. HSI wake-up time;

2. HSE and PLL

wake-up time (if

used);

3. Core power supply

wake-up time.

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