STR750FXX_1 datasheet(39/84 Pages) STMICROELECTRONICS

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STR750Fxx STR751Fxx STR752Fxx STR755Fxx

Electrical parameters

39/84

Typical power consumption

The following measurement conditions apply to Table 15, Table 16 and Table 17.

In RUN mode:

●

Program is executed from Flash (except if especially mentioned). The program consists

of an infinite loop. When fHCLK > 32 MHz, burst mode is activated.

●

A standard 4 MHz crystal source is used.

●

In all cases the PLL is used to multiply the frequency.

●

All measurements are done in the single supply scheme with internal regulators used

(see Figure 12)

In WFI Mode:

●

In WFI Mode the measurement conditions are similar to RUN mode (OSC4M and PLL

enabled). In addition, the Flash can be disabled depending on burst mode activation:

–

For AHB frequencies greater than 32 MHz, burst mode is activated and the Flash

is kept enabled by setting the WFI_FLASH_EN bit (this bit cannot be reset when

burst mode is activated).

–

For AHB frequencies less than or equal to 32 MHz, burst mode is deactivated,

WFI_FLASH_EN is reset and the LP_PARAM14 bit is set (Flash is disabled in WFI

mode).

In SLOW mode:

●

The same program as in RUN mode is executed from Flash. The CPU is clocked by the

FREEOSC, OSC4M, LPOSC or OSC32K. Only EXTIT peripheral is enabled in the

MRCC_PCLKEN register.

In SLOW-WFI mode:

●

In SLOW-WFI, the measurement conditions are similar to SLOW mode (CPU clocked

by a low frequency clock). In addition, the LP_PARAM14 bit is set (FLASH is OFF). The

WFI routine itself is executed from SRAM (it is not allowed to execute a WFI from the

internal FLASH)

In STOP mode:

●

Several measurements are given: in the single supply scheme with internal regulators

used (see Figure 12): and in the dual supply scheme (see Figure 13).

In STANDBY mode:

●

Three measurements are given:

–

The RTC is disabled, only the consumption of the LPVREG and RSM remain

(almost no leakage currents)

–

The RTC is running, clocked by a standard 32.768 kHz crystal.

–

The RTC is running, clocked by the internal Low Power RC oscillator (LPOSC)

●

STANDBY mode is only supported in the single supply scheme (see Figure 12)

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