AN1014 datasheet(18/25 Pages) STMICROELECTRONICS

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HOW TO MINIMIZE THE ST7 POWER CONSUMPTION

7.1.2.3 Wait Mode

Methodology: An external CLK source, up to 16MHz is used on pin CLKIN. PLL is disabled

and internal RC Oscillator is OFF. So, fOSC is CLKIN / 2. All peripherals are in reset configura-

tion except the I/O Ports. At reset the SMS bit in the MCCSR is 0, hence fCPU is fOSC. All Ports

are in Push-Pull Outputs with low level.

Measurements:

Table 14. Consumption IDD (Wait Mode) at TA = + 25 °C

7.1.2.4 Slow-Wait Mode

Methodology: An external CLK source, up to 16MHz is used on pin CLKIN. PLL is disabled

and internal RC Oscillator is OFF. So, fOSC is CLKIN / 2. All peripherals are in reset configura-

tion except Ports and the SMS bit in the MCCSR is set to 1, hence fCPU is fOSC/32. All Ports

are in Push-Pull Outputs with low level.

Measurements:

Table 15. Consumption IDD (Slow-Wait Mode) at TA = + 25 °C

External CLK

on CLKIN Pin

(MHz)

fCPU(MHz)

IDD at VDD = 4.5 V

IDD at VDD = 5 V

IDD at VDD = 5.5 V

1434

µA

1685

µA

1920

µA

907

µA

1054

µA

1205

µA

315

µA365 µA

433

µA

External CLK

on CLKIN Pin

(MHz)

fCPU(MHz)

IDD at VDD = 4.5 V

IDD at VDD = 5 V

IDD at VDD = 5.5 V

0.25

337

µA402 µA

475

µA

80.125

230

µA270 µA

316

µA

0.03125

128

µA146 µA

170

µA

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